JPH02287330A - Flash photographing device - Google Patents

Abstract

PURPOSE:To freely set the level difference of exposure value between a part irradiated with flash light and a part not irradiated with flash light by providing an arithmetic means for obtaining an exposure control value and a flash control value based on the photometric output of 1st and 2nd photometric means and the set level difference of the exposure value. CONSTITUTION:The 1st photometric means 1 measures the brightness BVS of the center part of a photographic image plane which is irradiated with the flash light and the 2nd photometric means 2 measures the brightness BVAM of the peripheral part of the photographic image plane which is not irradiated with the flash light. A setting means 3 sets the level difference CV of the expo sure value between the center part and the peripheral part of the photographic image plane at the time of being irradiated with the flash light and the arithme tic means 4 obtains the exposure control values TV and AVF and a flash control value DELTAEVF from the brightness BVS of the center part, the brightness BVAM of the peripheral part and the level difference of the exposure value CV. Thus, the level difference of the exposure value between the center part and the peripheral part of the photographic image plane can be set at a desirable value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a flash photography device, and is particularly suitable for daytime synchronized photography using flash light as auxiliary light under natural light.

[Prior Art] Conventionally, Japanese Patent Laid-Open No. 62-74729 discloses a flash photography device that controls the amount of flash light adjustment so that the main subject is properly exposed using natural light and flash light. The level difference between the exposure value with natural light alone and the exposure value with flash light added to natural light is fixed.

U.S. Pat. is disclosed.

U.S. Pat. An apparatus is disclosed that allows adjustment of the level difference in exposure value of each part.

[Problem to be solved by the invention] When performing flash photography, the amount of flash light adjustment is controlled so that the main subject is properly exposed using natural light and flash light. The parts that are illuminated (e.g. the main subject) and the parts that are not (e.g. the main subject)
For example, the difference in exposure value from the background) was set by the designer. However, there is a demand among advanced photographers to freely set the difference in exposure value between the areas irradiated with flash light and the areas not irradiated, according to their own photographic intentions.

U.S. Patent Section 4,373,793 and U.S. Patent Section 4.7
No. 48,468 discloses cases in which flash light is irradiated;
Contrast between the main subject and the background can be obtained by adjusting the exposure value when flash light is not irradiated, but these are full-screen irradiations, and contrast cannot be obtained when the main subject is near a wall.

The present invention has been made in view of the above points, and its purpose is to provide a flash photographing device that allows the user to freely set the difference in exposure value between the areas irradiated with flash light and the areas not irradiated with flash light. Our goal is to provide the following.

[Means for Solving the Problems] In the present invention, in order to solve the above problems, the first
As shown in the figure, the flash photographing device illuminates the center of the photographic screen, and includes a first photometer 1 that measures the brightness Bvs of the central portion of the photographic screen, and a first photometer 1 that measures the brightness BVAM of the peripheral portion of the photographic screen. a second photometering means 2, a setting means 3 for setting an exposure value difference C■ between the center and the periphery of the photographic screen during flash irradiation, and photometering outputs of the first and second photometering means 1°2. Exposure control values TV, A are set based on B V s , B V AM and the set exposure value step C■.
Calculating means 4 for calculating V and flash control value ΔEVF
It is equipped with the following.

[Effect] Hereinafter, the operation of the present invention will be explained with reference to FIG.

The first photometer 1 measures the brightness BVs of the central portion of the photographic screen illuminated with flash light. The second photometry means 2 measures the brightness B of the peripheral area of the photographic screen that is not irradiated with flash light.
Measure VAM. The setting means 3 sets the step CV of the exposure value between the central part and the peripheral part of the photographic screen when the flash is irradiated. The calculation means 4 calculates the brightness Bvs of the central part and the brightness B of the peripheral part.
From VAM and the exposure value step C■, the exposure control value T V
, A V F and the flash control value ΔEVF are determined. As a result, the difference in exposure value between the central part and the peripheral part of the photographic screen can be set to a desired value.

Here, the operation of the calculation means 4 will be explained in more detail. The exposure control values TV and AVF are based on the film sensitivity S■ inputted by the film sensitivity input means 5, the exposure value step C■, and the peripheral brightness BVA1. ．． The exposure control value calculation means 6 calculates the value based on the following. In the examples described below,
Although the shutter speed TV is set to the flash synchronization speed TVX, the shutter speed may be set to a value lower than the synchronization speed TVx by a predetermined calculation. The flash control value ΔEVF is calculated by the flash control value calculation means 7 based on the brightness BVs of the central area, the brightness BVAM of the peripheral area, and the level difference C■ in exposure value.

The flash control value ΔEVF may be a correction value for the amount of flash light control or a value that controls the flash emission time (the larger the flash control value ΔEVF, the shorter the flash emission time). In addition, a member (for example, a liquid crystal panel or an electrochromic panel) that can change the light transmission characteristics is arranged in front of the light emitting part, and the light transmission 1. +7 You can change the gender.

Further, according to the present invention, the set exposure value step C■ is displayed by the display means 8.

Note that the "periphery of the shooting screen" referred to here is
This does not mean only the true periphery of the photographic screen, but also refers to the part located around the center, that is, the part other than the center.

[Embodiment] FIG. 2 shows a circuit configuration of a camera as an embodiment of the present invention. In the figure, CPUB is a microcomputer (hereinafter referred to as "microcomputer") inside the camera body, and performs calculations for exposure control and automatic focus adjustment, as well as sequence control of the entire camera. The microcomputer CPUB is connected to various peripheral circuits and can exchange information with these peripheral circuits.

LMC is a photometry circuit, which measures the brightness BV at the center of the shooting screen.
It has a spot photometry function that measures s, and a peripheral photometry function that measures the brightness BVA of the entire screen excluding the center of the shooting screen. The information on the center brightness BVs and the peripheral brightness BVAM is converted into digital quantities and then transmitted to the microcomputer CPUB.

DEDR is a decoder driver, and the microcomputer CPU
Based on the aperture value and shutter speed calculated in B,
It drives the leading curtain travel start magnet ICMg, the trailing curtain travel start magnet 2CMg, and the aperture control magnet FMg, and also drives the motor M1 for film winding and charging.

DSP is a display circuit for on-body display.
It receives display data from the microcomputer CPUB and displays the necessary information on the liquid crystal display board on the camera body. Display contents include, for example, shutter speed, aperture value, exposure control mode, drive mode, flash mode, film counter, and the like.

FIN is a display circuit for performing infinder display, and receives display data from the microcomputer CPUB.
Display the necessary information in the finder. Display contents include, for example, shutter speed and aperture value, as well as flash charging completion indication, focus indication, focus detection failure indication, contrast between the center and peripheral areas of the screen during flash photography (
(differences in exposure values) and the flash irradiation range on the photographic screen.

The ISD is a film sensitivity reading circuit that reads the film sensitivity information recorded in the FIL-11 cartridge or the semiconductor memory attached to the cartridge, and sends it to the microcomputer CPU.
Communicate to B. This information is stored in A on the microcomputer CPUB.
Used for E calculation.

Note that this circuit ISD may be equipped with a manual operation member (push button, dial, etc.) so that the film sensitivity can be manually set and changed.

EMC is an exposure correction amount setting circuit, and outputs an exposure correction amount set by a known method to the microcomputer CPUB.

AFC is a focus detection circuit, which includes a circuit for driving a focus detection CCD that photoelectrically converts the subject light that has passed through the photographic lens, and an A/D circuit that processes the analog output of the COD.
and a circuit that converts the data and supplies it to the microcomputer CPUB.

AFMC is an AF motor control circuit that controls normal rotation, reverse rotation, and stop of the AF MOMO-2M2 for driving the focusing lens. This AF MOMO-2M2 rotation amount ΔN is monitored by the microcomputer CPUB, and it is possible to determine whether or not the AF MOMO-2M2 has been driven by a predetermined amount during automatic focus adjustment, and also allows the focus adjustment lens to be rotated by a predetermined amount. By knowing the amount of movement from the infinite photographing position, it is possible to calculate the photographing distance and photographing magnification of the main subject.

OFL is an external flash that is detachably attached to a hot-jet (not shown) on the top surface of the camera body, and its circuit configuration will be described later in the explanation of FIG. 3. TMI
is the connection terminal between the external flash ○FL and the camera body, and is located on the hot shoe.

IFL is an internal flash built into the camera body, and emits flash light under the control of the microcomputer CPUB. Is C2 the emission energy of the internal flash TFL?
This is a capacitor for Bm.

The LEC is a lens circuit built into the photographic lens, and transmits lens data unique to the photographic lens to the camera body. The contents of the lens data include, for example, the minimum aperture value (
The aperture value (open aperture value) AVo, Ijt, the large aperture value (aperture value relative to the minimum aperture aperture) AVn+ax, the focal length f, the conversion coefficient, etc. Here, the conversion coefficient is the focus detection circuit AFC.
This is a coefficient for converting the defocus amount DF obtained by the above into the driving amount ΔN of the focusing lens. TM2 is a connection terminal between the lens circuit LEC and the camera body, and is arranged at or near the lens mount.

SX is a synchronization switch that is turned on when the front curtain of the focal brain shutter completes travel, and when this switch SX is turned on during front curtain synchronization photography, a light emission start signal 5XON is issued to the external flash OFL via the connection terminal TMI.

FCC is a flash light adjustment circuit for controlling the amount of light emitted by the flash, and measures the amount of flash light incident from the photographing lens, and outputs a light emission stop signal FSTOP when the amount of flash light reaches a predetermined amount. This signal FST
OP is sent to the external flash OFL via the interface circuit INF and the connection terminal TMI, and causes the external flash OFL to stop emitting light. Also, this signal FSTOP
is also sent to the microcomputer CPU13, and when the microcomputer CPUB receives this signal, it stops the built-in flash IFL from emitting light.

INF is an interface circuit, and lens circuit LE
The C1 internal flash IFL is arranged between the external flash OFL and the microcomputer CPUB.

Each input port P, .about.P of the microcomputer CPUB is pulled up to the "'High" level by a resistor (not shown), and is connected to the ground level through a separate switch. When either switch is turned on,
The corresponding input port becomes "Lou+" level, and the ON10FF of each switch can be determined by the microcomputer CPUB. Each switch will be explained below.

This is the SM hamain switch, and this switch sM is ON.
When OFF, the camera becomes operational, and when OFF, the camera becomes inoperable.

Sl is a photographing preparation switch that is turned on by pressing down the first stroke of a release button (not shown), and when this switch is turned on, each operation of photometry, exposure calculation, and automatic focus adjustment is started.

S2 is O by pressing down on the second stroke of the release button.
This is the release switch that is turned on, and this switch is turned on.
Then, the exposure control operation is started.

SMD is a switch for switching exposure control mode, and each time this switch SMD is turned on, the exposure control mode is switched in the order of P mode, A mode, S mode, M mode, and P mode. Here, the P mode is a program AE mode in which the shutter speed and aperture value are automatically set on the camera side.

A mode is an aperture-priority AE mode in which only the aperture value is manually set, and the shutter speed is automatically set on the camera side. In S mode, only the shutter speed is set manually.
The aperture value is automatically set on the camera side in shutter speed priority AE mode. M mode is a manual mode in which both the shutter speed and aperture value are set manually.

SDR is a switch for switching drive modes, and each time this switch SDR is turned ON, the drive mode is alternately switched between single shooting mode and continuous shooting mode.

SFM is a switch for switching flash modes, and each time this switch SFM is turned ON, the flash mode is switched in the following order: forced flash mode, automatic flash mode, trailing curtain sync mode, non-flash mode, and forced flash mode. . Here, the forced light emission mode is a mode in which the flash is always emitted, and the automatic light emission mode is a mode in which the flash is automatically emitted according to the luminance distribution of the subject. In both modes, the flash is emitted in synchronization with the closing of the synchro switch SX. Further, the trailing curtain synchronization mode is a mode in which a flash is emitted in synchronization with the start of travel of the shutter trailing curtain. The non-light emitting mode is a mode in which flash light is not emitted under any circumstances.

Suρ is an up switch, SDN is a down switch, and when the shooting preparation switch S1 is OFF, it becomes an up/down switch for setting the aperture value or shutter speed, and when the shooting preparation switch Sl is ON, it is an up/down switch for setting the aperture value or shutter speed. (C value)
(, 1ffL< will be described later)
It becomes a down switch.

SAY is an aperture setting switch, and in M mode, when the shooting preparation switch S1 is OFF, this switch SAY is turned ON and the up/down switch S L is turned on.
Operating JP and SDN will increase or decrease the aperture value, and operating the up/down switches SUP and SDN while this switch SAV is at 0FFL will increase or decrease the shutter speed.

Next, the power supply will be explained.

EB is a power battery in the body, and its direct output voltage VO is the motor M + , M 2, and magnet FMg.

It is supplied to circuits and elements with large loads such as 1 CMg, 2 CMg, and internal flash IFL.

DDB is an in-body booster circuit that performs a boost operation when the in-body power supply control signal PWCB is at "Low" level. VH is a high voltage (for example, 13cm) used for powering the CCD in the focus detection circuit AFC, and VL is a high voltage (for example, 13cm) that is supplied to the power supply line vD via the diode D2 and is connected to the microcontroller C.
PUB, interface circuit INF, display circuit DSP
, is a low voltage (for example, 5V) that serves as the power supply for FIN, and V
C is a low voltage (e.g. 5V) that powers other circuits.
).

C1 is a backup capacitor, and high voltage VH
is charged by In the camera of this embodiment, as will be described later, during charging of the internal flash IFL, the in-body power supply control signal PWCB is set to "High" level to stop the in-body booster circuit DDB. As a result, voltages V, , VL, and vc are no longer output, but regulator REG is activated by the charging voltage of capacitor C1, and power continues to be supplied to power supply line VD via diode D1. Hence the internal flash! The microcomputer CPUB, display circuit DSP, and FIN are connected even while the FL is being charged.
continues to operate. Furthermore, in the camera of this example,
The voltage of backup capacitor C1 is
In order to prevent the microcomputer CPUB etc. from becoming inoperable due to the voltage becoming lower than the minimum voltage V + (for example 3V) at which EG operates, the voltage of capacitor C1 is monitored with the analog voltage monitor terminal A/D +, and the voltage of capacitor C1 is When voltage drops to the lowest operating voltage of the regulator REG, the internal power supply control signal PWCB is set to "Low" level to activate the booster circuit DDB and temporarily stop charging the internal flash IFL, and then the capacitor C1 is turned on again.
is charging.

A/D2 is a terminal for monitoring the charging voltage of the capacitor C2 for storing flash light energy in the internal flash IFL, and the microcomputer CPUB determines whether the charging voltage of the capacitor C2 is higher than a predetermined voltage 72. do. I will discuss this in detail later.

FIG. 3 is a block circuit diagram showing the internal configuration of the external flash OFL.

The CPUF is a microcomputer within the flash for performing sequence control within the flash. The microcomputer CPUF connects its terminal P only when flash emission is permitted.
When the light emission start signal 5XON is input to F3, a signal is sent to the flash light emission control circuit FLCC to start flash light emission.

EF is a power battery for flash.

MC is a capacitor for storing flash light energy in the external flash OFL.

DDF is an internal flash booster circuit that boosts the input voltage from the power supply battery EF and charges the capacitor MC. This circuit DDF performs a boosting operation when the internal flash power supply control signal PWCF is at "Low" level.

CVG is a flash internal constant voltage source, constant voltage FVDD
is supplied to the low power consumption section such as the microcomputer CPtJF of the external flash OFL.

M is a motor for switching the flash irradiation angle, and DR is its driver.

ZPC is a circuit that outputs position data of the flash illumination angle changing member driven by the motor M3, and specifically, it is composed of a code plate on which a conductive pattern is formed and a brush that reads the code from the code plate. ing.

FLCC is a flash light emission control circuit, which is similar to a known flash light emission section. This circuit FLCC is
The charging voltage of the capacitor MC is monitored, and when the charging voltage exceeds a predetermined 1irf (for example, 300V), a charging completion signal is output to the microcomputer CP LJ F in the flash. The flash light emission control circuit FLCC starts flash light emission when it receives a light emission start signal from the microcomputer CPUF, and stops flash light emission when it receives a light emission stop signal FSTOP from the flash dimming circuit FCC in the camera body.

FMS is a flash main switch for switching the external flash OFL to emit or not emit light. This switch FMS is connected to the terminal PFI of the microcomputer CPUF and also to the pulse generator PG. Every time this flash main switch FMS switches from OFF to ON, the pulse generator PG outputs "L our".
A level pulse is output and the microcomputer CP in the flash
An interrupt signal is input to the interrupt terminal INTF of UP. As a result, the flash microcomputer CPUF executes interrupt processing INT1 (see FIG. 16), which will be described later.

Note that when the internal microcomputer CPUB communicates data with the flash internal microcomputer CPUF, the internal microcomputer CPUB uses the connection terminal TMI.
``Low'' level flash translation signal C3 via
The FL is output to the microcomputer CPUF, and the microcomputer CP
When UP inputs this signal C3FL, that is, the signal line to which this signal is sent changes from the "Higb" level.
When the level changes to 'Low', the interrupt processing I N
T2 (see FIG. 17) is executed.

FBS is a bounce switch and is connected to the terminal PF2 of the microcomputer CPU. This switch FBS is
It is turned on when the angle (irradiation direction) of a light emitting unit (not shown) is changed in order to reflect the flash light on surrounding walls, ceilings, floors, and other surfaces to indirectly illuminate the subject.

FO3 is a switch that is turned on when off-camera flash photography is performed. This switch is for example
It consists of a regular switch installed near the shoe (not shown) of the external flash ○FL.
It is designed to turn off when the FL is attached to a hot shoe (not shown) on the camera body.

Note that the terminals PFI to PF4 of the microcomputer CPUP are also pulled up by a resistor not shown, similar to the terminals P and -P of the microcomputer CPUB.

This completes the description of the hardware configuration of the camera system to which the present invention is applied, and next the software configuration will be described with reference to flowcharts (FIGS. 4 to 17 [N)].

When the power supply battery EB is attached to the camera body, a power-on reset is applied to the microcomputer CPUB in the body, and the microcomputer CPUB starts processing from step #1 shown in FIG. In #1, it is determined whether the main switch SM is ON or not.

If main switch SM is not ON in #1, main switch S1. Considering the case where I is turned off, charging is stopped at #2 and terminal PWCB is set to “1”.
(ilb" level and stops the operation of the booster circuit DDB. Then, in #3, flags are reset and initial values are set in the registers, and in #4, the display circuits DSP and F
Transfer the data to turn off the display to IN and return to #1. This loop is repeated while the main switch SM is OFF. Note that previous values may be stored in the registers. If the main switch SH is ON in #1, the flag is reset in #5 and then the terminal pwc is turned on in #6.
B is set to °'Low'' level and the booster port i\IDB is activated.This activates the photometry circuit LMC and starts photometry operation.Then, in #7, the switch determination routine (see Fig. 14) is executed. After executing, display circuit DS in #8
Send display data to P and FIN and proceed to #9. In #9, it is determined whether the flash mode is a forced light emission mode.

If it is determined that the flash mode is forced flash mode in #9, the flash mode ■ subroutine (see Figure 6) is executed in #10, and the process moves to #11.In #9, the flash mode is set to forced flash mode. Otherwise, skip subroutine #10 and move to #11. #1
1, it is determined whether or not the photographing preparation switch S1 is ON. If the photographing preparation switch S is not ON in #11, the process returns to #1 and the above operations are repeated. Note that when the switch SM is in the ON state and no switch is operated for a predetermined period of time, the process may proceed to #2 in the same way as when the switch SM is turned OFF (auto power off function). If the photographing preparation switch S1 is ON in #11, the CCD is initialized in #12 and excess charge on the CCD is discharged. Next, in #13, input the film's ISO sensitivity S from the film sensitivity reading circuit ISD, and input the exposure compensation amount ΔS from the exposure compensation amount setting circuit EMC.
Enter. And #14. Lens circuit LE with #15
Lens data and flash data are input from C and external flash OFL, respectively. Next, CC in #16
The CCD performs the integral operation of D and is A/D converted in #17.
Take in the data, and use distance measurement wave r1 (focus detection) in #18.
I do. After the distance measurement calculation, the exposure calculation subroutine (see FIG. 9) is executed in step #1. Then, in #20, the flash mode subroutine (see FIG. 6) is executed. Then, the display data is transferred to the display circuits DSP and FIN, and at #21, the photographing preparation switch S1 is turned ON10F.
Determine F. If tlf, 4.73 preparation switch S, is not ON in #21, the process returns to #1. If the photographing preparation switch Sl remains ON in step #21, it is determined in step #22 whether or not the camera is in focus. If it is determined that the focus is not in focus in #22, the focusing lens is driven in #23 based on the distance measurement value obtained in #18, and the process returns to #14, and then
Repeat loop 3 until focus is achieved. During this time, when the photographing preparation switch S is turned off, the process returns from #21 to #1.

If it is determined in step #22 that focus is achieved, a subroutine (see FIG. 13) for calculating the irradiation angle of the flash is executed in step #24.

Next, in #25 shown in FIG. 5, it is determined whether the drive mode is the snapshot mode. As mentioned above, in the snapshot mode, the drive mode register DRR is set to DI” (
R=1. If it is the continuous shooting mode (DRR=1) in #25, it is determined in #26 whether or not it is the first image of continuous shooting based on the continuous shooting flag C0NTF. If it is the first snapshot, C0.
NTF=O, and C0NT if it is the second or later snapshot.
F=1.

If C0NTF=O in #26, it means that this is the first snapshot, and in #27 it is determined whether the flag FLOKF is 1 or not. Here, the flag FL○KF is a flash 0K7-7 flag indicating that flash emission is necessary and the external flash OFL is operable.
27 If F L OK F = 1 ``C' jb, input flash data from the external flash OFL in #28, and determine whether charging of the external flash OFL is completed based on this flash data in #29. If charging of the external flash OFL is not completed in #2, it is determined in #30 whether switch S1 is ON or not, and if switch S is ON, the process returns to #28 and switch S1 is turned on.
If t is OFF, return to #1. Here, switch S1
The reason for determining the state is to enable settings such as exposure control mode while the external flash OFL is being charged. If it is determined in #2 that the external flash ○FL has been fully charged, C0NTF is set to 1 in #31, and the process moves to #33. If FLOKF=O in #27, the external flash OFL charging completion determination (#28, #29) is skipped and the process moves to #31. Also, C0NTF at #26
If =1, it means that the second or later snapshot is to be taken, so the process directly moves to #33. From the above, in continuous shooting mode, the external flash OFL is used for the first frame.
will be used preferentially.

On the other hand, if it is not snapshot mode in #25, that is, DRR=
If it is O, the continuous shooting flag C0NTF is reset to 0 in #32, and the process moves to #33.

In #33, it is determined whether the release switch S2 is ON. If the release switch S2 is not ON in #33, it is determined in #34 whether the photographing preparation switch SI is ON. At #34, the shooting preparation switch Sl is turned on.
If it remains the same, the exposure calculation subroutine (see FIG. 9) is executed in #35, and the flash mode I subroutine (see FIG. 6) is executed in #36. Then, the display data is transferred to the display circuits DSP and FIN, and the process returns to #33. Therefore, the focus is locked by keeping the switch S1 ON. If the photographing preparation switch S1 is not ON in #34, the process returns to #1 in FIG. -“On the other hand, if release switch S2 is ON in #33, then #3
In step #8, an exposure control subroutine (see FIG. 11) is executed, and in step #39, it is determined whether the continuous shooting flag C0NTF is 1 or not. If C0NTF=1 in #39, that is, if it is continuous shooting mode, the process returns to #14 in FIG. Therefore, in continuous shooting mode, shooting is performed continuously by keeping the release button pressed down to the second stroke. On the other hand, if C0NTF=0 in #39, that is, in single shooting mode, switch S is turned off in #40.
Wait until it reaches F and return to #1.

Next, each subroutine will be explained.

FIG. 6 shows the subroutine of flash modes I and I[. First, when the flash mode I subroutine is called, the flash mode register FM
Determine the flash mode based on the value of R (see Figure 14) (#S1.#S15° #S 17. #S 24>
. In #S1, it is determined whether the flash mode is a forced light emission mode. If the flash mode is the forced light emission mode, the process moves to the flash mode ■ subroutine. In this subroutine (flash mode ■), #S
2 sets the flag FLF to 1, which indicates that the flash will be emitted.
Then, in the P and A modes, if the shutter speed is faster than the synchronized speed T V X, the shutter speed TV is set to the synchronized speed T V x (#S 3 ). In addition, S
, in M mode, the shutter speed is set to the tuning speed T V
It may be possible to warn the photographer to set the flash to a slow speed less than or equal to
Flash data is input from FL, and the presence or absence of external flash OFL is determined in #S5. If it is determined in #S5 that the external flash OPL is attached, the flash main switch FM of the external flash OFL is set in #S6.
It is determined whether or not S is ON based on the flash data. If it is determined in #S6 that the flash main switch EMS of the external flash OFL is ON, the external flash OF+- is operable, so the flash OK flag F L OK F is set to 1 in #S7. Next, in #S8, it is determined whether the bounce switch FBS is ON or the off-camera switch FOS is ON. If the bounce switch FBS is ON or the off-camera switch F○S is ON in #S8, it is determined in #S whether charging of the external flash OFL is completed, and if charging is not completed, in #S10 It is determined whether the switch S is ON. Then, while the switch S is ON, #S4 is used until charging of the external flash OFL is completed.
~ Repeat the loop of #S9, while switch S1 is O
When it becomes FF, return to #1. When charging of the external flash OFL is completed in #S9, charging routine A (see No. 7111) is executed in #S11, and the process returns.

On the other hand, if the bounce switch FBS is OFF and the off-camera switch FO3 is OFF in #S8, the one of the external flash OFL and the internal flash IFL that has been fully charged first is caused to emit light. For this purpose, it is determined in #S12 whether charging of the external flash OFL has been completed, and if charging has been completed, the charging completion flag READYF is set to 1 in #S13 and the process returns.

If charging of the external flash OFL is not completed in #S12, charging routine B (see FIG. 8) is executed in #S14, and the process returns.

Also, even if the external flash OFL is not connected in #S5 or even if the external flash OFL is connected,
If the flash main switch FMS of the external flash OFL is not ON in #S6, the charging routine A (see FIG. 7) is executed in #S23, and the process returns.

Next, if the flash mode is not the forced flash mode in #S1, it is determined whether the flash mode is the automatic flash mode in #S15, and if the flash mode is the automatic flash mode, the backlight flag RL is set in #S16.
I'll determine whether F (details will be described later) is 1 or not. If the backlight flag is 1 in #S16, the process moves to the subroutine of flash mode (2) and performs the same operation as in the forced flash mode described above.

If the backlight flag RLF is not 1 in #S16, it means that there is no backlight condition, so the flash flag FLF is set to 0 in #S25, as in the non-light-emission mode described later.
In #S26, the charging completion flag READYF is also set to O and the process returns. In addition, in #S10, it is determined whether or not the subject has a low capture power, and if the subject is dark and there is a risk of camera shake if photographed using only natural light, the process proceeds to #S2 and flash photography is performed. Also good.

If the automatic light emission mode is not set in #S15, the process moves to #S17, and it is determined whether or not the rear curtain synchronization mode is set. If it is the rear curtain synchronization mode, it is determined in #S18 whether the mode is P mode or A mode, and if it is P mode or A mode, the flag BulbF is set to 1 in #S19, and in #S21
to move to. If it is not P mode or A mode, #S2
0, the flag Dulb'F is set to 0 and the process moves to #S21. Here, the flag BulbF is a flag that is set when bulb photography is performed. In #S21, the flash flag FLF is set to 1, and then in #S22, the external flash priority flag 0UTF is set to 0.

This is because the camera system of this embodiment uses the internal flash IFL in the rear curtain synchronization mode. Then, in #S23, charging routine A (see Figure 7)
Execute and return.

If it is not the rear curtain synchronization mode in #S17, it is determined in #S24 whether the flash mode is the non-light emission mode, and if it is not the non-light emission mode, the process returns to #S1. If the flash mode is the non-emission mode in #S24, the flash flag FLF is set to 0 in #S25, the charging completion flag READYF is also set to 0 in #S26, and the process returns.

FIG. 7 shows the contents of charging routine A.

In this subroutine, capacitor C2 is charged until charging of internal flash IFL is completed. When this subroutine is called, it is checked in #S30 whether charging of the internal flash IFL is completed (capacitor C
2) is determined. If charging is completed, charging is stopped in #S37. When charging is completed in #S30, the booster circuit DDB is always operating, so the terminal PWCB is at the 'Low' level.Then, the charging completion flag READ is set in #S38.
Set YF to 1 and return. On the other hand, if charging of the internal flash IFL is not completed in #S30, it is determined in #S31 whether the charging voltage of the capacitor C2 for storing light emission energy of the internal flash IFL is equal to or higher than the predetermined voltage v2.

Here, the meaning of the predetermined voltage V2 will be explained with reference to FIG. In the figure, the vertical axis represents the charging voltage of the capacitor C2, and the horizontal axis represents the passage of time after the start of charging the internal flash IFL. Vmax is the charging completion level of capacitor C2 (
For example, 300 V) and reaches the charging completion level Vmax at time t2. While the main capacitor of the flash is being charged, the power supply voltage fluctuates greatly, making it impossible to perform operations such as focus detection accurately, or to drive the motor. Therefore, conventionally, focus detection operation, winding operation, etc. were started after charging was completed, that is, after time L2. On the other hand, in this embodiment, when the power supply voltage becomes stable enough to perform the focus detection operation accurately and drive the motor, the focus detection operation and winding operation are performed in parallel with the charging operation. etc. have started.

Therefore, according to this embodiment, the time t when charging is completed
If the focus detection operation, winding operation, etc. have already been completed in step 2, the next photographing operation can be performed immediately. Further, even if the focus detection operation, winding operation, etc. are not completed, the waiting time can be shortened by the time (t2 L+) compared to conventional cameras. In the camera of this embodiment, focusing on the point that the power supply voltage becomes stable if the charging voltage of the capacitor is high, the charging operation starts from time L1 when the charging voltage of the capacitor C2 reaches a predetermined voltage V2 (for example, 250V). Focus detection operations and the like are performed.

Returning to the charging routine A in FIG. 7, the explanation will be continued. #S
If the charging voltage of the capacitor C2 of the internal flash IFL is equal to or higher than the operation start voltage 72 at 31, the charging completion voltage Vm
In order to further increase the voltage to a, capacitor C is connected in #S36.
Start charging 2.

Then, the terminal PWCB is set to the "Loll" level so that focus detection operation etc. can be performed, and the step-up circuit DDI3 is activated, and then the process returns.If the charging voltage of the capacitor C2 is lower than the operation start voltage V2, the terminal PWCB is゛'
After setting the voltage to High'' level and stopping the booster circuit D D13, charging of the capacitor C2 is started in #S32,
In #S33, it is determined whether the charging voltage of the backup capacitor C1 is equal to or lower than a predetermined voltage V1.

Here, the predetermined voltage ■ is the lowest operating voltage of the regulator REG. In this camera system, the internal microcomputer CPUB and display circuit DSP
To enable FIN to operate, power supply voltage is supplied to the microcomputer CPUB, display circuit DSP, FIN, and interface circuit INF by the regulator REG. Therefore, when the voltage of the backup capacitor C1 becomes lower than the minimum operating voltage ■1, charging of the capacitor C2 is temporarily stopped in #S34, and the terminal PWCB is set to the "Low" level to operate the booster circuit DDB, and the capacitor C1 is Recharging. Then, in #S35, when the charging voltage of the capacitor C1 reaches a predetermined value and the backup function can be sufficiently performed, the process returns to #S30. If the voltage of the backup capacitor C1 is higher than the minimum operating voltage ■ in #S33, #S34. #S35 is skipped.

While charging capacitor C2, this loop of #S30 to #S35 is repeated, and in #S30, the charging voltage of capacitor C2 reaches the charging completion voltage V max, or in #S31, the charging voltage of capacitor C2 reaches the operation start voltage 72 or higher. If so, I will return it.

Note that in this embodiment, the exposure control mode cannot be set while the capacitor C2 is being charged, but #S33
．． In the path returning from #S35 to #S30, a subroutine for switch determination may be executed so that the exposure control mode and the like can be set even while the capacitor C2 is being charged.

FIG. 8 shows the contents of charging routine B.

In this subroutine, capacitor C2 is charged until either one of external flash OFL and internal flash IFL is fully charged.

Then, the flash that has been fully charged first will be used to emit flash light. When this subroutine is called, it is determined in #S40 whether or not the internal flash IFL has been fully charged. If the internal flash IFL has been fully charged in #S40, charging is stopped in #S53, and the charging completion flag READYF is set to 1 in #S54. In this case, the internal flash IFL completes charging first, so the external flash priority flag is set to 0UT in #S55.
Set F to 0 and return. Here, the flag 0UTF
is a flag that is set when causing the external flash OF'L to emit light. # Internal flash IFL with S40
If charging is not completed, similarly to charging routine A, it is determined in #S41 whether the voltage of the capacitor C2 of the internal flash IFL is equal to or higher than the operation start voltage 72, and if it is equal to or higher than the operation start voltage 72, In order to further increase the charge completion voltage to Vmax, the capacitor C2 is charged in #S52. Then, the terminal PWCB is set to the "Lou+" level, the booster circuit DD)3 is activated, and the process returns.

Further, if the charging voltage of the capacitor C2 is less than the operation start voltage 72, the terminal PWCB is set to 'T(iBh') in #S42.
After setting the voltage to the level and stopping the booster circuit DDI3, charging is started. Next, in #S43, flash data is input from the external flash OFL, and in #S45 it is determined whether the external flash OFL has been fully charged. #94
If the external flash OFL has been fully charged in step 5, #
After stopping the charging of the internal (internal) rush IFL in S49, the terminal PWCB is set to the "'Lou+" level and the booster circuit DDB is activated. Then, charge completion flag READ
Since YF is set to 1 and the external flash OFL has completed charging first, the external flash priority flag ○UTF is set in #S51.
Set it to 1 and return. If the external flash OFL has not been fully charged in #S45, it is determined in #S46 whether the voltage of the backup capacitor C1 is equal to or lower than the minimum operating voltage ■1 of the regulator REG. #S4
If the voltage of the backup capacitor C1 is lower than the minimum operating voltage V in #6, charging of the internal flash IFL capacitor C2 is stopped in #S47, and the terminal PWCB is set to "Lo".
w" level to activate the booster circuit DDB and charge the capacitor C1 again. Then, in #S48, when the charging voltage of the capacitor C1 reaches a predetermined value and the backup function can be sufficiently performed, the process returns to #S40. #S46
If the voltage of the backup capacitor C1 is not less than ■1, skip steps #S47 and #S48,
#Return to S40. While charging capacitor C2, this #S4
Repeat the loop from 0 to #S48, and check whether the charging voltage of the capacitor C2 reaches the charging completion voltage V...ax in #S40, or
At #S41, the charging voltage of capacitor C2 reaches operation start voltage 7
2 or more or external flash ○FL with #S45
Returns when charging is complete. Note that, similarly to the charging routine A, the switch determination routine may be executed during the return from #S46° and #S48 to #S40.

FIG. 9 shows a subroutine for exposure calculation.

When this subroutine is called, in #S60, the brightness BVs of the central part of the photographic screen is input from the photometry circuit LMC, and in #S61, the brightness BVAM of the part other than the central part (periphery) is inputted.
is input from the photometric circuit LMC.

After that, the brightness difference ΔI3V (=BVA
MBV! 3) is determined (#562), and the photometry completion flag LMENF is set to 1. Next, in #S64, ΔBV
>O, that is, whether or not there is backlight. If ΔBv>o in #S64, it is determined that there is backlight,
In #S65, the backlight flag RLF is set to 1, and the process moves to #S67. If ΔBV≦0 in #S64, it is determined that it is front light, and in #S66, the backlight flag RLF is set to O, and #S6
Move to 7. In #S67, exposure control (determines whether the wholesale mode is P mode or not, and if it is not P mode, moves to #S79 and uses the aperture value and/or shutter speed set in A mode, S mode, or M mode. Based on this, exposure calculation is performed, and in #S80, the photometry completion flag LMENF is set to 0 and the process returns.

On the other hand, if it is the P mode in #S67, it is determined in #S68 whether the flash mode is the forced light emission mode or not.

If the flash mode is not forced flash mode, #S6
In step 9, it is determined whether or not the automatic light emission mode is set. If the automatic light emission mode is set, the process proceeds to #S70, and it is determined whether or not to emit flash light. In #S70, the backlight flag R
If LF is set or the brightness value BVs of the center part is less than or equal to a predetermined value (or a value that changes depending on the focal length of the lens), it is determined that the flash will be emitted,
Proceed to #S71; otherwise, flash photography will not be performed, so proceed to #S78, perform exposure calculation based only on natural light, and proceed to #S80. Also, #S6
If the automatic light emission mode is not set in step 9, the process moves to #S78.

Further, if the flash mode is the forced light emission mode in #S68, the process advances to #S71.

Next, exposure calculation (#S71) when firing the flash is performed.
~#577) will be explained. In #S71, the up/down subroutine (see FIG. 15) is called. Here, since it is the photometry completion letter fi (LMIENFl), the process moves from #5180 to #5192 shown in FIG.
The determination routine is executed to determine the contrast (CV value) between the center and the periphery, and the process returns.

Here, the CV determination routine will be explained. When proceeding to this routine, the microcomputer CPU13 determines whether or not the up switch 5LJP is ON in #S91, as shown in FIG. 10, and if the up switch SUP is ON, #
In S92, it is determined whether the up switch SUP has changed from OFF to ON.

Then, the up switch SUP changes from OFF to ON.
If it is hit, proceed to #S93 and set the CV value to 0.5.
Increase by step (0,5EV) and return to #S91. #S
If the up switch SUP is OFF in 91,
Alternatively, if the up switch 5LIP is kept in the ON state in #S92, the process advances to #S94. In other words, C.V.
The value is increased by +0°5EV only when the up switch 5LIP changes from OFF to ON. #S9
In step 4, it is determined whether the down switch SDN is ON or not, and if the down switch SON is ON, #S95
It is determined whether the down switch SDN has changed from O or FF to ON. As with the up switch SUP, only when the down switch SDN/+ (OFF changes to ON), #S96 changes the CV value by 0.5 steps (0, 5E
V). #S94 turns down switch SON
is OF'F, or if the down switch SDN is kept in the ON state in #S95, the process returns.

The CV value determined by this CV determination routine is determined by the difference in exposure value between the peripheral area of the shooting screen that is not illuminated with flash light and the center area of the shooting screen that is illuminated with flash light during flash photography. This indicates how many steps the peripheral area is overexposed relative to the area. This CV
The values will be explained with reference to FIG. 19. In addition,
Although FIG. 19 shows a backlit situation, the same applies to a frontlit situation.

FIG. 19 shows the exposure values of the peripheral part and the central part in the APEX system. In the figure, A and B are the exposure values E VAM (-B
VAMI-S V), E V s (= B V s+
S■) are shown respectively. Then, C indicates the exposure value EV of the central part when the flash light is spot irradiated only to the central part, and if the exposure value due to only the irradiated flash light is QV, E V T = E V g + QV becomes.

If a spot of flash light is irradiated only on the central part, the peripheral part will not be irradiated with flash light. Therefore, natural light exposure is controlled based on the peripheral brightness BVAM,
The CV value can be arbitrarily set by controlling the flash light Next, the control of the flash light to obtain an arbitrarily set CV value will be explained.

Now, assume that the shutter speed determined based on the peripheral brightness BVAM is TV, and the aperture value is AV. Since the central part is overexposed by ΔS■ over the proper value, the amount of light required for the central part is 2T■+AV+Δsv. On the other hand, the amount of natural light incident on the center is 2BVS
+S■. Therefore, the amount of flash light required at the center is: 2TV+AV+ΔSV BvS+SV.

By the way, since the peripheral area is exposed more than the central area by Cv, the peripheral area is less than the appropriate value (ΔSV+CV
) are overexposed. Therefore, the amount of light required in the peripheral area is 2T+AV+Δsv+cv. However, since the peripheral area is exposed only by natural light, 2T■+AV+ΔSV+CV BVA・+5v=2, . 2TV+AV+Δ5V=2BVA, +5V−CV holds true.

Therefore, the amount of flash light required at the center is 2 B
VA M 10S VCV B V S+ S
It becomes V.

As is clear from this, setting the CV value uniquely determines the required amount of flash light.

Next, consider the amount of flash light required.

The proportion of the flash light amount 2TV+AV4-ΔSV BVs+SV out of the light amount 2T■+AV+Δsv required for the central area is: 2TV+AV+ΔSV BvS+5v2TV+AV+
ΔSV 2 B V AN + S VCV l-2BVs+SV (BVAM+SV CV)1
2 CV (B V AM B Vs) 1, 2
CV-ΔBV. This can be shown graphically as shown in FIG. 20. In addition, in the same figure, (a) is backlit (ΔBV>0)
, (b) shows the state in front light (ΔBV≦0).

As is clear from the graph, the smaller the CV value, the
That is, the greater the amount of exposure of the central portion relative to the peripheral portion, the greater the amount of flash light required. In addition, the CV value is calculated as the difference ΔB between the peripheral brightness BVAM and the central brightness [3vs].
When set to V, there is no need for any flash light intensity, and you can achieve the desired contrast (
It can be seen that CV=ΔBV) is obtained. Then, the difference in exposure amount (contrast) between the periphery and the center is made larger than the difference in brightness between the periphery and the center (i.e.,
Since it is impossible to further darken the center by irradiating the center with flash light, CV≦ΔBV.

The graph shown below both graphs shows the amount of light adjustment amount correction ΔEVF (A P E
The relationship between the X value) and the CV value is shown. The light adjustment amount correction amount ΔEVF (APEX value) is expressed as a logarithm with a base of 2 of the ratio of the flash light amount to the required light amount, and is ΔEV·=ffiog2 (1-2cv asv). For example, as shown in FIG. 20(b), when the ratio of the flash light amount is 1/2, ΔEVF=1, and it is sufficient to correct the light control amount level by one step to the under side. Also, when the ratio of the amount of flash light is 1, that is, when the necessary amount of light is obtained only with the flash light (for example, when the center is in true darkness (ΔBV=-Co)
(or when the peripheral area is exposed to pure black (CV--co), etc.), ΔE V F = 0, and no correction of the amount of light adjustment is necessary. When the ratio of the flash light amount is O, that is, when exposing only with natural light, ΔE
(2) F-1 (1): In other words, the amount of light adjustment is corrected to the under side by ω steps, and no flash light is emitted at all.

Note that, as is clear from Equation 1 (%), which indicates the proportion of flash light, the proportion of flash light does not depend on the exposure correction amount ΔSV, but depends on the brightness difference ΔB between the peripheral area and the center area.
It depends only on V and its contrast value CV. In other words, the contrast is determined only by the relative relationship between the center and the periphery, and has no relation to the absolute value (appropriate level).

Returning to FIG. 9, the explanation will be continued.

After determining the CV value in #S71, it is determined in #S72 whether or not there is backlight. If the backlight flag RLF is set,
Proceed to #S74 and limit the CV value to ΔBV or less. The reason for this is that, as described above, it is impossible to make the contrast between the periphery and the center larger than the difference in brightness between the periphery and the center.

On the other hand, if the backlight flag RLF has been reset in #S72, the process advances to #S73 and the CV value is limited to (ΔBV-1) or less. Thereby, as shown in FIG. 20, at least half of the amount of exposure of the central portion is obtained by flash light. This is to make the most of the effect of the flash light in the photograph without unnecessarily restricting the flash light when the subject is not backlit.

Once the CV value is determined, the aperture value AVF for flash photography is determined in #S75. As mentioned above, the exposure control value is determined based on the peripheral brightness BVAM, and the relationship between the aperture value AV and the shutter speed TV is TV+AV+4SV=
The relationship of BVA and +5V-CV holds true. During flash photography, the shutter speed TV is set to the flash sync speed T V x, so the aperture value AVF during flash photography is AV F = BV AM + SV A S
V CV T V x.

Subsequently, in #S76, the above-mentioned light adjustment amount correction amount ΔE
Calculate VF. After that, in #S77, the CV value and the exposure correction amount ΔSV are displayed.

This display is performed in the viewfinder or on the CD panel on the top of the body using an analog scale of ±2.5 steps, as shown in FIG. Same figure (a).

In (b), the triangular mark EVT below the scale indicates the exposure value E■1 at the center, and the triangular mark EV
, indicates ΔS■. Further, the triangular mark EVAM above the scale indicates the exposure value EVA of the peripheral area. And both marks EVT.

EVA, the interval indicates the CV value.

For example, in FIG. 21(a), Δ5V=-0,5, CV model 1
．． 5, and the same figure (b) shows ΔSV=+1 and CVO15.

FIG. 21(c) shows a modification of the display of the exposure correction amount Δsv and cv value, and displays the same values as in FIG. 21(a). In this variant, the display is done with a barcode. Each dot forming the barcode is composed of an LED panel capable of emitting two colors of red and green, for example. The dot EV indicating the exposure value EVT in the center and the other dots emit light of different colors, for example, the dot EV is red,
Other dots are displayed in green. The length of the lit barcode indicates the Cv value. Note that the color of each dot may be the same, and the display form of the dot EV and other dots may be changed, for example, the dot EV
It is also possible to make the T blink and the other dots light up.

After displaying the exposure correction amount Δsv and cv value, the photometry completion flag LMENF is reset to 1 in #S80, and the process returns.

FIG. 11 shows a subroutine for exposure control. When the release button is pressed to the second stroke, the mirror is unlocked and switch S2 is turned on.
Proceed to this subroutine.

When this subroutine is called, the magnets ICMg, 2CMg, and FMg are energized in #3100. As a result, even if the mirror is raised and the shutter is released, the shutter front curtain will not run. Furthermore, the lock of the aperture is released and the aperture starts to be narrowed down. Then #510
The number of aperture stages from the open aperture is calculated according to the aperture value previously determined in step 1. If the aperture value obtained earlier in #5102 is not the open aperture value, wait until the aperture has been narrowed down by the number of steps determined in #5101 in #5103, and then turn off the power to the magnet FMg in #5104 to stop narrowing down. let

If the aperture value found earlier in #5102 is the open aperture value, &
, skip #3103 and immediately go to #S 104
to stop filtering. Next, in #5105, the previously determined flash light adjustment amount correction amount ΔEVF is output to the flash light adjustment control circuit FCC. Magnet with #5106?
-Turn off the power to the ICMg and start running the shutter front curtain. Next, in #5107, the flash flag FLF
is 1 or not. FLF=O in #5107
In other words, when shooting using only natural light,
In #5108, it waits for the previously determined exposure time TV to elapse, and in #3109, the magnet 2CMg is de-energized and the shutter trailing curtain starts running. After exposure is completed in #3123 (after the shutter trailing curtain has completed running)
, wind the film, adjust the shutter, mirror, and aperture, and return.

When the flash flag FLF is 1 in #5107,
In #S1.10, it is determined whether the valve flag 13ulbF is 1 or not. If BulbF = O, #81
At step 11, a light emission routine is executed. In this subroutine, as shown in FIG. 12, it is determined in #5126 whether bounce photography or off-camera flash photography is to be performed. If you want to perform bounce photography with #5126 or flash photography off-camera, use #5127.
Turn on the internal flash IFL and return. #
If it is determined in step 5126 that the shooting is not bounce shooting or off-camera shooting, it is determined in #S 128 whether the external flash priority flag 0UTF is 1 or not.

If 0UTF=O, the internal flash IFL is made to emit light at #S L 29, and the process returns.

#, If 0UTF=1 in S128, return as is. Note that the shutter front curtain starts running at #5106, and at #5127. When the process reaches #5129, the synchro switch SX is already turned on.

After running the light emitting routine at $811.1, #5112
Then, it is checked whether the previously determined exposure time TV has elapsed. If the exposure time TV has not yet passed, #3113
Then, it is determined whether or not the light emission stop signal FSTOP has been output from the flash dimming control circuit FCC. and,
When the signal FSTOP is output, the internal flash IFL stops emitting light in #5114, and the process returns to #5112. Note that the signal FSTOP is the external flash OF'L
/\ is also output, and when this signal is output, the external flash ○FL also stops emitting light. If the signal FSTOP is not output in #5113, the process returns to #5112. The above operations are repeated until the exposure time TV has elapsed.

When it is determined in #S i, 12 that the exposure time TV has elapsed, the process advances to #5115 and the magnet 2CMg
Turn off the power and run the shutter rear curtain. Thereafter, charging routine B (see FIG. 8) is executed in #5116, and after the shutter trailing curtain has completed running in #3123, the film is wound and the shutter, mirror, and aperture are charged, and the process returns.

If BulbF = 1 in #5110, the rear curtain synchronization mode is in effect, so the process waits for the release switch S2 to be turned off in #S11.7. When the release switch S2 is turned off, the internal flash IFL is caused to emit light in #5118. Then, the process waits in #5119 for the light emission stop signal FSTOP to be output from the flash dimming control circuit FCC, stops the light emission of the internal flash IFL in #S120, and moves to #5121. In #5121, the magnet 2CMH is de-energized and the shutter trailing curtain starts running. Then, in #S122, the above-mentioned charging routine A (see FIG. 7) is executed to charge the internal flash IFL.
When the charging of the capacitor C2 is completed or the charging voltage reaches the operation start voltage 72 or higher, the process proceeds to #5123, and after the shutter trailing curtain has completed running, winding and charging of the shutter, mirror, and aperture are started. and return.

FIG. 13 shows the irradiation angle calculation routine.

When this subroutine is called, first in #5130 it is determined whether or not the flash flag FLF is 1, and then
If LF=O, return as is. F L F
If = 1, input the focal length r data from the lens circuit LEC in #3131, and set the photographing magnification β in #3132.
Calculate.

Next, the flash irradiation angle θ1 is determined. Here, the flash irradiation angle will be explained with reference to FIG. 22. The size (height or width) of the subject! , the shooting distance is d, and the flash irradiation angle is θ. At this time, if the illumination angle θ1 is set so that the flash light illuminates only the subject, then as is clear from the figure, jan(θ, /2>=1/2d.On the other hand, if the photographing magnification is β, the lens If the focal length of is r, then β-f/d, so θ+= 2jan-'
(t'-β/2f). In this example, the height is 180
Based on a full-body photo of a cm person, 1 = 180
0 Cmm). In other words, θ+=2 jan-'(9Q Qβ/f).

Once the irradiation angle θ1 is determined, the process proceeds to #3135, and according to Table 1, focal length data ``v'' that has the same angle of view as the flash irradiation angle θ1 determined in #3134 is determined.

Table 1 For example, if θ1=65°, fv=28 [:mm
).

Next, in #5136, data on the focal length rv is output to the external flash OFL, and in the external flash ○FL, the motor M for switching the illumination angle is driven based on the data on the focal path l'v. Note that in #8136, the flash flag FLF and external flash priority flag 0UTF are set to prohibit or permit the external flash OFL to emit light.
The contents of are also output to the external flash OFL. While the irradiation angle is being switched with the external flash OFL, the flash irradiation range is displayed on the finder screen in #5137 on the camera body side (described in f&). And #81
In step 38, flash data is input from the external flash OFL, and in step #3139, it is determined whether or not the irradiation angle switching operation has been completed. If the irradiation angle switching has been completed, the process returns.

Here, the display of the flash irradiation range in #S1.37 will be explained using FIG. 23.

As an example, consider a case where a lens with a focal length of 28n+m is used. If the focal length fv that has the same angle of view as the flash irradiation angle θ found in #8134 is 50 m+a, frame F1 is displayed in the shooting screen FRM, and the focal length fv
is 35 mm, frame F2 is displayed. By displaying the flash irradiation range on the shooting screen FRM in this way, the photographer can easily check the flash coverage. The irradiated area can be easily confirmed.

By the way, the narrower the flash irradiation range, the greater the amount of flash light irradiated per unit score, and the larger the flash guide number 〇No. Table 2 shows an example of the relationship between the focal pressure i11[v of the lens and the guide number 〇No.

Table 2 For example, when taking a photograph using a photographic lens with a focal length of 28 mm, suppose that the flash illumination angle θ1 required to illuminate the entire body of the main subject is equal to the angle of view of a lens with a focal length of 85 mm11. , the guide number 〇No. after switching the illumination angle is 32/22=1.45 from Table 2. Therefore, in this case, compared to the case where the entire photographing screen is irradiated, the guide number 〇No. is approximately 1.5 times larger, and the reach distance of the flash light can also be increased approximately 1.5 times.

FIG. 14 shows the switch discrimination routine.

#5150 has a switch SMD for switching exposure control mode
Determine whether or not is ON, and if ON, #515
1, it is determined whether the exposure control mode register is MORll. If MOR=11, set MOR=OO with #S 1.52, and if MOR≠11, set #515
3, MOR=MOR+1 and the process moves to #3155. Here, the exposure mode register MOR is a 2-bit register for selecting four types of exposure control modes, and when it is M○R-00, it is the program AE mode (
When MOR=01, aperture priority AE mode (A mode) is selected; when MOR=10, shutter speed priority AE mode (S mode) is selected; when MOR=11, manual mode (M mode) is selected. Ru.

Thereafter, the process waits for the switch SMD to turn OFF in #3155, and then returns.

If the switch SMD is not ON at $3150, #
5156, drive mode switching switch SDR is O.
Determine whether it is N or not. If switch SDR is ON, drive mode register DRR is set to 1 in #5157.
Determine whether or not, and if DRR=1, #5158
Then, set DRR=O, and if DRR≠1, #5159
Then, DR11 is set to 1. Here, DRR is a 1-bit register for selecting the drive mode, and DRR
When =O, single shot mode (single frame shooting), DRr (=1
When , quick shooting mode (continuous shooting) is selected. After that, drive mode switch SDR is turned OFF in #3161.
Wait until it becomes , and then return.

If switch SDR is not ON in #3156, #
At 5162, it is determined whether the flash mode switching switch SFM is ON. If the switch SFM is ON, the process moves to #3163, and it is determined whether FMR=11 or not. If FMR=11, FMR is set in #S164.
=OO, and if FMR≠11, use #5165 to F
Set MR=FMR+1 and proceed to #3167. Here, FMR is a register for selecting four types of flash modes, and when FMP-=OO, it is forced flash mode, when FMR=01, it is automatic flash mode, and when FMR=10, it is automatic flash mode. For FMR-11, the rear curtain synchronization mode is selected, and for FMR-11, the non-emission mode is selected. Wait until the switch SFM turns OFF at rL#si6'7, and then return.

#S 168 is an up/down switch (S up
y' S 1) Determine whether N) is ON. If neither the up switch S nor the down switch SON are ON, the process returns directly. If either is ON, the IJI''/DOWN subroutine is executed in #5169.

As shown in FIG. 15, this UP/DOWN subroutine first determines in #5180 whether LMENr;'1. If LMENF=1, the shooting semi-sieve switch S
Since 1 is ON, the up/down switch (S u
p/S DN) will be used to set the contrast l-C2 stages, the program moves to #5192, executes the previously explained CV determination subroutine, and returns. On the other hand, if LMENF=0, the switch Sl is OFF, so the up/down switch (S LIP/S
DN) will be used to set the aperture value AV or shutter speed TV, and the process advances to #5181. $318
1, in order to know the controllable range of the aperture, lens data (maximum aperture value, open aperture value) is obtained from the lens circuit LEC.
Enter. Then, in #5182, it is determined whether the exposure control mode is manual mode (M mode).

In M mode, use #5183 to set the aperture setting switch sA.
It is determined whether or not v is turned on, and if it is turned on, the aperture value AV is set to a predetermined value (for example, 0.5EV) in #5184.
), and according to the lens data (maximum aperture value, maximum aperture value) input in #5181, #31
In step 85, the aperture value AV is limited, and the process moves to #5191.

If the aperture setting switch SAv is not turned on in #3183, the shutter speed TV is set to the specified rli in #3186.
(for example, IEV), and use #5187 to limit the shutter speed TV (for example, 5EV≦TV≦12).
EV) and move to #5191. M in #5182
If not, enter A mode (aperture priority A) in #5188.
E mode), and if it is A mode, #
The process moves to S1:84 to set the aperture value AV. ＃S
], If it is not A mode at 88, it is determined whether it is S mode (shutter speed priority AE mode) at #5189, and if it is S mode, the process moves to #5186 and the shutter speed TV is set. . #If the S mode is not selected in S18'9, the exposure control mode is P mode (Program A).
E mode), so the aperture value AV and shutter speed T
Proceed to #5191 without making any settings for V.

In addition, when in P mode, switch S up (S DN>
If is ON, set the shutter speed TV! (for example, by 0.5EV) and the aperture value A.
V may be decreased (increased) by the same value.

In this way, by operating the switches SUP, 5I)N, it becomes possible to perform the so-called program shift I. After the above, the process waits for the up/down switch (S up/S DN) to turn off in #5191, and then returns.

Next, the operation of the internal flash microcomputer Cr'UF in the external flash OFL will be explained. When the flash main switch FMS of the external flash OFL changes from OFF to ON, the pulse generator PG is activated as described above.
interrupt pin INT.

An interrupt occurs. When an interrupt to the interrupt terminal INTF occurs, the flash microcomputer CPUP executes the interrupt process INTl shown in FIG. 16. In this interrupt processing,
First, interrupts are enabled in #F1, and it is determined in #F2 whether or not the flash main switch FMS is ON.

If the flash main switch FMS is ON, #F
3 determines whether charging of the main capacitor MC is completed, and if charging is not completed, starts charging with #F4,
If charging is complete, stop charging with #F5 and press #
Return to F1. #F2 flash main switch FMS
If is OFF, charging is stopped at #F6, and the standby state is entered to wait for the next interrupt to occur at #F7.

Also, the flash selection signal CS from the camera body side
When F_L becomes the "'Low" level, the flash microcomputer CPUF executes the interrupt process INT2 shown in FIG. 17. In this interrupt processing INT2.

First, interrupts are disabled in #F10, and it is determined in #F11 whether or not the flash main switch FMS is ON. If the flash main switch FMS is OFF,
#F12 stops charging the main capacitor MC, and #F
13 enables interrupts, and #F14 causes a standby letter. If the flash main switch EMS is ON, it is determined in #F15 whether the signal is transmitted from the flash to the camera body or from the camera body to the flash. If the signal 1 is received from the flash to the camera body, it is determined in #F16 whether or not charging of the main capacitor MC has been completed. If charging is complete, #F17
Set the third bit b2 of the flash data FLD to 1,
If charging is not completed, set the third bit b2 of the flash data FLD to 0 in #F18, and set the third bit b2 of the flash data FLD to 0 in #F19.
to move to. Here, the flash data FLD is 3 bits b2. This data consists of bb and bb. #F
At step 19, it is determined whether or not the motor M3 for switching the illumination angle is being driven. If the motor is being driven, the second bit N+1'r1 of the flash data FLD is set in #F20, and if the motor is not being driven, the flash data FL is set in #F21.
The second bit b1 of D is set to 0, and the process moves to #F22. In #F22, it is determined whether the bounce switch FBS is ON or the off-camera switch FO8 is ON. If the bounce switch FBS is ON or the off-camera switch 10S is ON, the first bit b of the flash data FLD is set in #F23. is set to 1, and if the bounce switch FBS is OFF and the off-camera switch FO8 is OFF, the first pin l-b of the flash data FLD is set to 0 in #F24, and the process moves to #F25. Flash data FLD obtained as above
is output to the camera body side with #F25, and waits for the flash select I/signal C9FL to become "High" level in #F36. When the signal C3FL becomes ""High" level, enable interrupts in #F37. and return.

On the other hand, if the signal is transmitted from the camera body to the flash in #F15, data from the camera body is input in #F26. The data includes focal length "V" data for switching the irradiation angle and flash flag FLF.
, external flash priority flag 0UTF, etc.

At #F27, the flash select signal C5FL is 'Hi'
Wait for the signal C3FL to become “Hi” level.
g l+" level, the flash flag FLF is determined at #F28. If FLF=O, flash photography is not performed, so flash emission is prohibited at #F31, and the process proceeds to #F32.

If FLF=1 in #F28, flag 0U in #F29
Determine TF. If 0UTF=O, the external flash OFL will not emit light, so the process proceeds to #F31. 0tJ
If TF=1, the external flash OFL is caused to emit light, so light emission is permitted in #F30, and the process proceeds to #F32.

At #F32, subsequent interrupts are enabled, and the process advances to #F33. #F33 is the motor M for switching the irradiation angle.

to drive. #F34 has a coated plate ZP for irradiation angle detection
The signal from C is input and the motor M is driven until the irradiation angle corresponds to the focal length "V". When the irradiation angle switching is completed, the motor M is stopped at #F35 and the process returns.

Most importantly, the flags and registers used in the above embodiment are summarized in Tables 3 and 4, respectively.

(Left below) Thirdly, in the embodiments described above in Table 4, the internal flash IFL was fired in the rear curtain sync mode, but even in the rear curtain sync mode, the external flash OFL was not used. For this purpose, the above embodiment may be modified as follows.

First, we will explain the hardware changes. First, delete the synchro switch SX. And the microcomputer CPUl
A signal line dedicated to the light emission start signal 5XON is provided from 3.
This is connected to terminals P and 3 of the microcomputer CPUF in the external flash via the connection terminal TM1.

Next, changes to the software I/ware will be explained. First, in the flowchart of FIG. 6, step #S22 (OU
T F = O) and proceed from #S21 to #S12. Then, in #5118 of FIG. 11, the subroutine of "light emission routine J (FIG. 12) is called. If 0UTF=1 in #5128, the light emission routine outputs the light emission start signal 5XON to the external flash OFL. Change to

Alternatively, only the software may be changed as follows.

First, in #5136 (Fig. 13), the flash emission mode is also set to the external flash OFL as flash data.
Output to. Then, in #5118 (Fig. 11), the flag 0UTF is determined, and if 0UTF=1, the light emission start signal S T A RT (different from S Change to output to external flash OFL via. Then, after #F26 (Fig. 17), the microcomputer CPUF in the flash outputs the light emission start signal S T
A step of determining whether AR,T is issued is provided.

If the signal 5TART is issued, a signal is sent to the flash dimming control circuit FLCC to cause the flash to emit light regardless of whether light emission is permitted or not, and to return. When the signal 5TA11.7 is not issued, the process proceeds to #F27. Then, a step is provided between #F29 and #F30 to determine whether the light emission mode is the rear curtain synchronization mode,
If it is the rear curtain synchronization mode, the process advances to #F31 and changes are made to prohibit flash emission.

It is also possible to change the hardware as shown in FIG.

When the flag 0UTF is set, the microcomputer cp
From the un terminal P Ill to the NAND circuit NAND1 “
l (i g b ” level is output, and in the second curtain synchronization mode, from the terminal pH to the N Or (circuit N0RI (displayed in negative logic), and the AND circuit ANDI “Tl1
g1-level is output. Synchro switch SX is N
It is connected to the OR circuit circuit OR1. The release switch S2 is connected to an AND circuit AND1 via a one-shot circuit S1.

When the switch S2 is turned off, the one-shot circuit O81 outputs a high-level one-shot pulse with a predetermined time width.The outputs of the NOR circuit N0R1 and the AND circuit ANDI are both input to the OR circuit OR1,
The output of the R circuit OR1 is input to the NAND circuit NAND1. The output of the NAND circuit NAND is the terminal TMI
Light emission start signal 5XON to external flash ○FL via
is entered as .

During normal flash photography using an external flash OFL, the terminal P10 outputs the Higl+'' level, and the terminal P11 outputs the I L oIII11 level, so when the ninth act has finished running, switch SX is output.
turns ON, the output of the NAND circuit NAND1 becomes 'L'.
ow” level. Therefore, jsuri5XON is input to the external flash OFL, and the external flash OFL
fires a flash. Note that the terminal P1. From l L
Since the oIIIT level is being output, even if the switch S2 is turned OFF after shooting and the one-shot circuit ○S1 outputs a pulse at the 'I (igI+') level, the AND circuit AND1 will be at the 'Low level. Therefore, the signal SX○N will not be output again.

When in rear curtain synchronization mode using an external flash ○FL, 'High+' is output from both terminals P1° and Pz.
A level signal is being output. Therefore, even if the synchro switch SX is turned on, the NOR circuit OR,
1 does not output the "'Higb" level, and no light emission start signal is output. When the photographing is completed and the switch S2 is turned off, the one-shot circuit O3I outputs a 'trigb' level shot pulse. Since the 'High' level is output from the terminal P, the AND circuit AND1 outputs a 'fine shot pulse' of the 'trigb' level. 'Higb' level is output, and 'Higb' level is output from OR circuit OR1.Terminal P
,. 〜゛)Ihigh'' level is output, so
When the output of the OR circuit ORI reaches the "Ilibi 11'° level," the NAND circuit NAND1 outputs the "Low" level, and this output is input to the external flash OFL as the light emission start signal 5XON.Then, the external flash OFL emits light.

When the external flash OFL is not used, that is, when the flag 0tJTF=O, the terminal PIo becomes “Low”.
Since the level is output, the NAND circuit NAND1
continues to output “High” level.

Therefore, even if the switch SX is turned ON or the switch S2 is turned OFF, the light emission start signal 5XON is
is not output. Therefore, the external flash 0FT- does not emit light.

By configuring a circuit that outputs the light emission start signal 5XON in this way, the external flash OFL only needs to emit flash light when the light emission start signal 5XON is input, regardless of the flash mode. Therefore, even if a conventionally known normal flash device is used instead of a dedicated flash device, flash photography similar to the flash photography device of the present invention (such as rear-curtain synchronization or switching between internal flash and external flash) can be used. )It can be performed.

In addition, if TTL direct metering is performed using the flash dimming control circuit FCC and an appropriate exposure amount is obtained before switch S2 is turned OFF in rear curtain synchronization mode, the flash will flash even if switch S2 is ON. It is also possible to run the shutter trailing curtain without emitting light. By doing this, it is possible to obtain proper exposure even when shooting in rear-curtain synchronization mode under relatively bright conditions. In this case, the flash may be emitted in response to the start of the movement of the shutter trailing curtain, and the effect of the flash may be reflected in the photograph.

In addition, in the above implementation ρI, the exposure values for the peripheral area and the central area are determined by combining the exposure correction amount ΔS■ and the CV value.
It was designed to be freely configurable.

However, the invention is not limited to this, and either the central part or the peripheral part may always be properly exposed.

In order to ensure that the center area is always properly exposed, delete the exposure compensation amount setting circuit EMC and set Δ in the control program.
It is sufficient to set S■=0. Then, as shown by the broken line in FIG. 21(a), it is sufficient to fix the mark EVT at the center of the scale.Generally, the main subject is often located at the center of the shooting screen, so By ensuring that the main subject is always properly exposed, the main subject can always be properly exposed, which is particularly convenient for beginners and other people who are inexperienced with photography.

In order to ensure that the peripheral area is always properly exposed, the exposure compensation amount setting circuit EMC is deleted and the calculation in step #575 (Fig. 9) of the control program is changed to A V F = B V
All you have to do is change it to AM+SVTVx. As a result, the peripheral area is properly exposed to only natural light. Then, as shown by the broken line in FIG. 21(b), mark E
It is sufficient to fix the VAM at the center of the scale.

Here, we will consider the amount of light required to properly expose the peripheral area.

Since the peripheral area is properly exposed, in order to bring the contrast between the peripheral area and the center to CV, the central area only needs to be underexposed by CV compared to the appropriate exposure. Therefore, the amount of light required at the center is 2TVX+AVF-CV.Therefore, the amount of flash light required is 2TVX, 4-
AVF-CV BVS+SV, and the proportion of flash light in the light amount in the center is: 1-2BVs+, 5V-(TVX+AVF-CV)-1
−2°V−ΔBV′,′AV F=BVAM15V−TVX.

ΔB V ” B V AM B V 5. This is the same formula as explained in the previous example. In other words, the contrast is relative and has no relation to its absolute value. In addition, in the above example, when the light is on front, the proportion of the flash light is reduced to 1/2.
By doing the above, I was able to reflect the flash effect as much as possible in the photo. However, step #S
72, #373 (Figure 9) may be deleted so that the CV value can be freely set regardless of the luminance distribution of the subject (however, as mentioned above, C≦ΔBV) .

In addition, various modifications as described below can be made when implementing the present invention. for example,
By pre-flashing the flash and measuring the amount of incident light when the flash light is added to natural light, it is possible to freely set the amount of flash light that will give the subject an appropriate exposure, thereby determining the exposure value of the subject under flash irradiation. It is also possible to control the difference in the exposure value of the background due to natural light.Also, by providing a manual setting member for the irradiation range on the external flash OFL, you can freely set the areas that are illuminated by the flash and the areas that are not illuminated. In addition, it is also possible to make it possible to adjust the exposure value level difference in the image area.Furthermore, data regarding the flash irradiation range set on the flash side can be input from the flash to the camera, and the data can be input to the camera's viewfinder. The irradiation range of the flash may be displayed within the range. Furthermore, the metering range for the center and periphery of the shooting screen may be automatically switched based on the data regarding the flash's irradiation range.Furthermore, the exposure value setting means may be set not on the camera side but on the flash. It may be provided on the side so that data regarding the step in the exposure value set on the flash side is inputted from the flash to the camera, or even if the step in the exposure value is fixed, it will not be oval. Note that the present invention can also be applied to a camera with a built-in zoom flash. What's more, the flash irradiation range and the metering range for the center of the shooting screen are automatically set according to the shooting magnification, and the flash is dimmed to achieve the set (or fixed) exposure value steps. The amount may be controlled.

In the above embodiment, the irradiation range of the flash light was changed depending on the photographing magnification regardless of whether the camera was backlit or frontlit. By the way, when flash light is emitted in front light, the field of view is usually very dark and the aperture aperture is set large.

Therefore, the flash light reaches relatively far. On the other hand, when the subject is backlit, the field of view is usually bright, so the aperture aperture is set small. Therefore, when the light is backlit, the distance that the flash light reaches is relatively short.

Considering the above, narrowing the irradiation range of the flash light and increasing the guide number is very meaningful when the light is backlit, but it is meaningless when the light is front-lit. If the irradiation range is narrowed when the brightness is low, only the subject in the center will be exposed, and the subjects in the periphery may not be exposed at all. Therefore, the irradiation range of the flash light may be changed depending on the photographing magnification only when the subject is backlit. To make this modification, in the illumination angle calculation routine (Fig. 13), a step is provided to determine the backlight flags R and LF before step #3131, and when R, LF = 1, the process proceeds to #5131. Then, when RLF=o, just return as is.

Furthermore, in the forced flash mode, the photographer intends to reflect the effect of flash light on the photograph. Therefore, in the forced flash mode, it is desirable to make the flash light reach as far as possible. Therefore, in the above modification, the irradiation range of the flash light may be changed in accordance with the photographing magnification even in the forced light emission mode. To modify in this way, in the above modification, when RLF=O, the flash mode register F
Check MR, if F MR = 00, step #
5131, and if FMR≠00, just return.

When transformed in this way, when the brightness is low (j [light)], by setting the automatic flash mode (FMR = 01), everything within the shooting range and within the reach of the flash light will be exposed to the flash light. can do. By setting the forced light emission mode (FMR=00), it is possible to irradiate only the main subject with flash light and expose only the main subject.

Furthermore, in the above embodiment, the flash that was charged first among the internal flash FL and the external flash OFL was emitted, but the present invention can also be applied when two external flashes are used. can. It can also be applied to cameras with two built-in flashes. or,
If three or more flashes are used (regardless of whether they are built-in or external), the flash that has completed charging the earliest may be set to emit light.

[Effects of the Invention] According to the present invention, in a flash photographing device that illuminates the center of the photographic screen, the exposure value between the central portion of the photographic screen that is irradiated with flash light and the peripheral portion of the photographic screen that is not irradiated with flash light is determined. Since you can freely set the level difference, you can set the exposure value for the center of the shooting screen to be under or over compared to the periphery. Therefore, by positioning the main subject in the center of the shooting screen, the main subject illuminated by the flash light can be expressed as being bright or dark against the background, and by making it possible to display the degree of illumination. This has the effect of allowing the photographer to take photographs that accurately represent the fallen country.

Note that if the setting means for setting the step difference in exposure value is also used as the setting means for setting the aperture value and/or shutter speed, the number of parts can be reduced and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of the present invention, FIG. 2 is a circuit diagram of a camera system as an embodiment of the present invention, FIG. 3 is a circuit diagram of an external flash used in the same, and FIGS. Figure 17 is a flowchart showing the same operation as above;
The figure shows the change over time in the charging voltage of the internal flash used in the same as above, Figure 19 is an explanatory diagram to explain the amount of dimming of the flash used in the same as above, and Figure 20 (a) and (b) respectively show backlighting. Figure 21 is a diagram showing a display example of the finder display section used in the above, and Figure 22121 is a diagram showing the relationship between the difference in exposure value between the peripheral and central areas and the ratio of flash light intensity at 1110 and 1110 light hours. FIG. 23 is a diagram showing a display example of the flash irradiation range on the infinder display section of the same as above, and FIG. 24 is a circuit diagram of a main part of an example of a part of the present invention. It is. 1 is a first photometry means, 2 is a second photometry means, 3 is a setting means, and 4 is a calculation means.

Claims (6)

[Claims] (1) A flash photography device that illuminates the center of the shooting screen, including a first photometer that measures the brightness at the center of the screen, and a second photometer that measures the brightness at the periphery of the screen. a setting means for setting an exposure value difference between the central part and the peripheral part of the photographing screen when the flash is irradiated;
and a calculation means for determining an exposure control value and a flash control value based on the photometry output of the second photometry means and the difference in set exposure values. (2) The calculation means includes film sensitivity input means for inputting the film sensitivity, and exposure control value calculation means for calculating the exposure control value based on the film sensitivity, the brightness of the peripheral area, and the step of the set exposure value. The flash photography device according to claim 1, comprising: (3) The calculation means includes flash control value calculation means for calculating the flash control value based on the brightness of the central part, the brightness of the peripheral part, and the step of the set exposure value. Or the flash photographing device according to 2. (4) The flash photographing device according to claim 3, wherein the flash control value calculating means calculates a correction amount of the flash light control amount. (5) The flash photographing device according to any one of claims 1 to 4, further comprising display means for displaying a step difference in set exposure values. (6) The flash photographing device according to any one of claims 1 to 5, wherein the setting means also serves as means for setting an aperture value or a shutter speed.