JPH0651377A - Zoom strobe and camera with built-in zoom strobe - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a zoom strobe capable of proper exposure during short-distance shooting and a camera having a built-in zoom strobe. A strobe CPU 51 is provided for inputting a current focal length and a current shooting distance of a zoom lens 70, and moving a light emitting portion 61 by a strobe zoom motor 67 according to the input current focal length to control an irradiation angle. Strobe CPU
51, when the input current shooting distance is smaller than a predetermined value, move the light emitting unit 61 to a wider angle side than the irradiation angle corresponding to the current focal length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom strobe for changing an irradiation angle according to a focal length of a photographing lens and a camera incorporating the zoom strobe.

[0002]

2. Description of the Related Art Focal length of photographing lens,
That is, there is known a zoom strobe that changes the irradiation angle according to the angle of view. Since the arc tube of the strobe device is located away from the optical axis of the shooting lens, when the subject is close to the camera, the strobe light irradiation range does not match the shooting range of the shooting lens, and the subject is not irradiated with strobe light. There are cases.

On the other hand, with regard to flash light emission control, a so-called TTL automatic light control system (hereinafter referred to as "TTL system")
In the case of adopting, the amount of incident light (the amount of light received by the film) is measured through the photographing lens after strobe emission, and the strobe emission is stopped when the amount of received light reaches a predetermined value. In the control of this TTL method, the amount of reflected light is relatively small when the shooting distance is relatively long, so the amount of light received is measured after light emission, and there is sufficient time to stop light emission after the amount of light received reaches a predetermined value. Therefore, appropriate exposure becomes possible. However, when the shooting distance is very short, such as during macro shooting, the amount of reflected light becomes so large that the amount of received light reaches a predetermined value in a short time, and the light emission stop control may be delayed and overexposure may occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in stroboscopic photography using a conventional zoom strobe, and provides a zoom strobe and a camera having the zoom strobe built-in, which are capable of proper exposure during short-distance photography. With the goal.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a zoom strobe equipped with an irradiation angle varying device, wherein the focal length information of the photographing lens and the information inputting means for inputting the photographing distance information and the focal length inputted by the information inputting means are used. An irradiation angle control means for driving the irradiation angle changing device is provided, and when the shooting distance input by the information input means is smaller than a predetermined value, the irradiation angle control means has a wider angle side than the irradiation angle corresponding to the focal length. And driving the irradiation angle changing device.

According to a third aspect of the present invention, in a camera with a built-in zoom strobe, the focal length detecting means for detecting the focal length of the photographing lens, and the irradiation angle according to the focal length detected by the focal length detecting means. An irradiation angle control means for driving the changing device and an imaging distance detection means for detecting an imaging distance of the imaging lens are provided, and the irradiation angle control means has an imaging distance detected by the imaging distance detection means smaller than a predetermined value. In some cases, the irradiation angle changing device is driven to the wide angle side.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. 1 is a block diagram showing an embodiment of a control circuit of an AF single-lens reflex camera with a built-in flash to which the present invention is applied, FIG.
FIG. 3 is a block diagram showing an embodiment of a control circuit of a strobe device to which the present invention is applied.

The camera body 10 has a flash control, AF
A CPU 11 that executes general processing relating to camera shooting operations such as control and exposure control;
IPU 13 for setting photographing conditions and the like, display control, and performing predetermined communication with the photographing lens 70, and an AF CCD
The sensor 16 and the DPU 15 that functions as an interface for the photometric IC 17 are provided. Main CPU1
1, IPU 13 and DPU 15 are connected to each other via a bus line, and exchange predetermined data with each other via the bus line.

The main CPU 11 includes a DPU 13 and I
It is a microcomputer that centrally controls the entire system of the PU 15 and this camera. Connected to the main CPU 11
The E ² PROM 12 stores various kinds of data relating to shooting, and these data are read and used by the main CPU 11 at appropriate times.

The DPU 13 is mainly a CCD distance measuring sensor 1.
6 and a photometric IC (sensor) 17 output a distance measuring signal and a photometric signal to the main CPU 11 as an interface and a strobe control function for controlling the light emission of the built-in strobe 19.

The IPU 15 has a display control function of displaying shooting information such as a flash emission mode, an exposure mode, the number of shots, a shutter speed and an aperture value on the LCD panel 21. The strobe flash mode includes a front curtain / rear curtain sync flash mode. Although not shown, these light emission modes are selectively selected by operating a mode switch or the like connected to the IPU 15. CPU1
Although not shown in detail, the built-in flash circuit 19 connected to the DPU 13, the DPU 13, and the IPU 15 includes an arc tube, a charging circuit, a light emission control circuit, and the like.
5. The CPU 11 controls the light emission timing and the DPU 13 controls the automatic light control.

The main CPU 11 includes, as switches, a photometric switch SWS and a release switch SW.
A switch circuit 23 as a switch group including R and various detection switches is connected. Photometric switch SWS
As is well known, the release switch SWR is interlocked with a release button (not shown). When the release button is half pressed, the photometric switch SWS is turned on, and when the release button SWR is fully pressed, the release switch SWR is turned on. Although not shown, the switch circuit 23 is provided with a mechanical charge completion detection switch, a film winding completion detection switch, a shutter rear curtain traveling completion detection switch, etc. These switches are turned on when the operation of various mechanisms of the camera is completed. It is composed. The states of these switches are input to the CPU 11, and the CPU 11 controls various operations based on the states of these switches.

The camera body 10 also has three motors: an AF motor 25 for automatic focus adjustment, a wind motor 29 for winding and rewinding a film, and a mechanical charge motor 31. The AF motor 25 is controlled by the main CPU 11 via the motor driver 27, and the mechanical charge motor 31 and the wind motor 29 are controlled by the main CPU 11 via the motor driver 33. The mechanical charge motor 31 moves (charges) to the standby position against the spring force for moving the front curtain and the rear curtain of the shutter, and moves the diaphragm lever for narrowing the diaphragm to the open position against the spring force (charge). Charging), and further down (charging) the mirror to the observation position against the spring force. Each of the above members is locked by a mechanical locking means (not shown) at the charging completion position.

Further, a release magnet 35, a front curtain shutter (first) magnet 37, a rear curtain shutter (second) magnet 39 and an EE magnet 41 are connected to the main CPU 11 as magnets via magnet drivers. ing. The release magnet 35 releases the mechanical lock of the charged member when energized. On the other hand, the leading-curtain magnet 37 and the trailing-curtain magnet 39 electromagnetically lock the leading and trailing curtains released by the energization of the release magnet 35, instead of the mechanical locking, when energized. When the energization is stopped, the traveling is allowed and the shutter is controlled.

Further, the main CPU 11 is connected to an EE circuit 43 having an EE pulser for generating an EE pulse in conjunction with a narrowing mechanism (not shown). CPU1
The number 1 counts the EE pulse each time the EE pulse is output from the EE circuit 43 that works in conjunction with the aperture mechanism that works in conjunction with the mirror-up operation, and when the value matches the predetermined value calculated in advance, the EE magnet. 41 is energized to lock the narrowing mechanism and stop the narrowing.

As described above, the distance measuring sensor 16 of the phase difference detection system and the photometric IC 17 for detecting the subject brightness are connected to the DPU 13. The distance measuring sensor 16 includes
CCD image sensors have been used in which a large number of pixels are arranged in rows. Each pixel signal sequentially output from (the CCD image sensor of) the distance measuring sensor 16 is converted into pixel data that can be processed by the main CPU 11 in the DPU 13, and then output to the main CPU 11. The main CPU 11 executes a predetermined calculation based on the pixel data from the DPU 13 to calculate the defocus amount, and drives the AF motor 25 based on the calculated defocus amount.

Although not shown, the photometric IC 17 is provided with a photometric light receiving element and a logarithmic compression circuit, and the output signal of the photometric light receiving element that receives the subject light flux is logarithmically compressed by the logarithmic compression circuit and output to the DPU 13. The DPU 13 converts this photometric data into predetermined subject brightness data and outputs it to the main CPU 11. The main CPU 11 A / D-converts the subject brightness data, and calculates the shutter speed and aperture value (EE pulse number) based on the subject brightness Bv data, film sensitivity information, and the like.

The structure relating to the flash emission control is as follows. The main CPU 11 outputs a trigger signal for causing the built-in strobe to emit light to the built-in strobe circuit 19,
A light emitting tube (not shown) provided in the camera emits light. Before the light emission, the DPU 13 has a built-in flash circuit 1
9 receives a light emission preparation completion signal. The light emission preparation completion signal is sent from the DPU 13 to the IPU 1 via the CPU 11.
5, and a predetermined display is made on the LCD panel 21.

The DPU 13 is provided with an integrating circuit (not shown) for integrating the amount of reflected light from the object which has passed through the taking lens and reaches the film surface. After the strobe light is emitted, the integrated value of this integrating circuit is a predetermined value. If it coincides with, the quench signal for stopping the light emission of the arc tube of the built-in strobe 19 is output to the built-in strobe circuit 19. In this embodiment, the light amount integration is performed after the traveling of the shutter front curtain is completed. Further, the main CPU 11 is the DPU 13
The quench signal output from the DPU 13 is monitored, and the quench signal from the DPU 13 is also used for automatic dimming control of the external strobe device.

The IPU 15 causes the LCD 21 to display photographing information such as a strobe light emission mode and dimming light emission. IPU
Reference numeral 15 exchanges shooting information with the main CPU 11, such as a flash emission mode, a shooting mode, the number of shots, a focus state, a shutter speed and an aperture value. IPU15 is
When receiving the light emission preparation signal from the main CPU 11, the built-in flash circuit 19 is caused to start charging.

Further, the main CPU 11 communicates with the strobe CPU 51 mounted on the external zoom strobe 50 through a predetermined contact point of an accessory shoe (not shown), charging completion data, rear curtain / first curtain synchronization. Data or slave tuning data, auto / manual dimming data, T
Communication of predetermined data such as TL photometry mode is executed.
The IPC 15 exchanges information such as the focal length f and the range of usable aperture values with the lens CPU 71 of the taking lens 70, and also exchanges information necessary for various calculations and controls with the main CPU 11. Give and receive.

Next, an embodiment of the circuit configuration of the external zoom strobe 50 will be described with reference to FIG. The external zoom strobe 50 includes a strobe CPU 51 that enables advanced light emission control and a remote control communication circuit 53 that communicates with a remote control communication circuit 45 of the camera body 10. The strobe CPU 51 directly communicates with the main CPU 11 via the contact point group of the accessory shoe when the external zoom strobe 50 is attached to the accessory shoe of the camera body 10, and when not attached, the remote control communication circuit. 45, 5
Communication is carried out via 3. Remote control communication circuits 45, 5
The signal transmission medium between the three is a conductor, an optical fiber, or an electromagnetic wave or an infrared ray.

The slave receiving circuit 55 connected to the strobe CPU 51 includes a light receiving element for receiving another strobe light, and when the light receiving element receives the strobe light, outputs a light receiving signal to the strobe CPU 51. Strobe CPU51
When this light receiving signal is input, the
Perform light emission processing.

The external zoom strobe 50, like the conventional strobe, has a power supply circuit 57 including a battery, a booster circuit 59, a main capacitor C, a light emitting (xenon) tube 61a, a light emitting portion 61 including a reflector 61b, and a light emitting portion. A control circuit 63 is provided. Flash mode, dimming mode,
The strobe zoom mode, focal length, corresponding irradiation angle, etc. are displayed on the LCD panel 69 provided on the outer surface of the main body of the external zoom strobe 50.

The light emitting portion 61 is formed so as to be movable toward and away from the condenser lens 61c, and the irradiation angle is changed (strobe zooming) by this contact and separation movement. Strobe CPU51
Has a function as an information input unit and an irradiation angle control unit, and drives the zoom motor 67 via the motor drive circuit 65 based on the focal length information and the shooting distance information input from the camera 10 to perform a predetermined operation. Zoom in. The position (irradiation angle) of the light emitting unit 61 is detected by the strobe CPU 51 via a position detection member (not shown). Other known mechanisms can be used as the irradiation angle varying device. For example, changing the opening angle of the reflector,
A known mechanism such as one that moves the condenser lens can be applied.

FIG. 3 shows a more detailed structure of the zoom lens 70. The zoom lens 70 is a power zoom lens equipped with a zoom motor, and has a zoom optical system including a focusing lens group and a zooming lens group (not shown).

The focusing lens group includes an AF mechanism 75.
Driven by. The driving force of the AF motor 25 is transmitted to the AF mechanism 75 via the AF joints 77a and 77b. The zooming lens group is driven by a PZ (power zoom) mechanism 85, and the PZ mechanism 85 is driven by a zoom motor 83 controlled by a lens CPU 71 via a motor drive IC 81. Absolute position of zooming lens group and focusing lens group, that is, focal length and shooting distance (focused subject distance)
The zoom code plates 89 each have a known configuration.
And the distance code plate 91 detects. The zoom operation switch 93 is an operation switch for performing power zooming at a predetermined zooming speed in the tele direction and the wide direction, respectively.

The lens CPU 71 is an interface 7
2 and the main CP via the IPU15 of the camera body
It is connected to U11 and executes predetermined data communication with the main CPU 11 by bidirectional communication. Lens CPU7
The data transmitted from 1 to the main CPU 11 are the maximum aperture value, the maximum aperture value, the current focal length detected by the zoom code plate 89, and the current shooting distance detected by the distance code plate 91.

The above camera body 10 and zoom lens 7
The flash photography process using the 0 and the external zoom strobe 50 will be described with reference to FIGS. 4 to 7. First, the processing in the camera body 10 at the time of shooting will be described in more detail with reference to the flowchart shown in FIG. This processing is executed by the main CPU 11. When a main switch (not shown) is turned on and power supply to the main CPU 11 and the like is started, the main CPU 11 executes this flowchart.

When this flow chart is entered, first in step (hereinafter "S") 101, the initialization of the hard surface and the initialization of the soft surface are executed. Next, in order to alternately execute AF processing and photometric calculation processing,
Start the 100ms timer and release switch SW
A 4 ms timer for periodically checking the state of R is started (S103, S105). Note that these timers are hard timers.

After starting these timers, it is checked whether or not the automatic focusing mode (AF) is set, and the AF
Otherwise, jump to S117 (S107, S11
7). At the time of AF, it is checked whether or not the CCD integration of the distance measuring sensor 16 is completed under the condition that the photometry switch SWS is turned on. If the integration is completed, the integration data is input from the DPU 13 and a predetermined value is obtained. AF calculation is performed, the AF motor 25 is driven based on the calculation result, the process proceeds to S117, and if the CCD integration is not completed, the process directly proceeds to S117 (S107, S109, S11).
1, S113, S115, S117, or S107,
S109, S111, S117).

In S117, it is checked whether or not the 4 ms timer is counting up, and if it is counting up, the 4 ms timer is reset and the release switch S
The WR is checked (S117, S119). If the release switch SWR is turned on, the release process is executed (S121 to S123). Then, the wind process is executed and the process returns to S103 (S121 to S1.
25).

The details of this release process are known processes and will not be described in detail, but the main CPU 11 causes the mirror up, the aperture and the shutter curtain to travel.
When the front curtain is synchronized, a light emission trigger signal is output to the external zoom strobe 50 to make the external zoom strobe 50 emit light when the traveling of the front curtain is completed. Further, during TTL light control, the DPU 13 measures the subject light amount received via the zoom lens 50 by the photometric IC 17 after the shutter front curtain is opened. When the amount of received light reaches a predetermined appropriate amount, the DPU 13 outputs a light emission stop signal to the external zoom strobe 50 to stop light emission.

When the 4 ms timer is not counting up, or when the release switch SWR is not turned on even when counting up, the process proceeds to S127 (S117, S127 or S117 to S121, S1.
27).

In S127, it is checked whether or not the 100 ms timer has counted up, and if it has not counted up, the process returns to S107. If the 100ms timer is counting up, reset the 100ms timer (S
117, S127, S129). If the flash emission mode, exposure mode information, shutter speed, and aperture value are manually set from the IPU 15, those information are input, and the external zoom strobe 50 inputs charging completion data, front curtain / rear curtain synchronization data. Input data such as, auto / manual dimming data, TTL dimming data,
Current focal length data, current shooting distance data, controllable aperture value data, etc. are input from the zoom lens 70 (lens CPU 71) (S131).

Next, from the DPU 13, the photometric IC 17
Enter the photometric data (subject brightness Bv) detected by
D conversion, subject brightness Bv and film sensitivity Sv
A shutter speed, an aperture value, etc. are calculated based on the data and the like (S133, S135). Then, these data are output to the IPU 15, and as the flash information set on the camera side, data such as the focal length, the shooting distance, the second curtain / first curtain synchronization mode, the aperture value, and the exposure mode of the camera are externally zoomed. Output to strobe 50 and zoom lens 70
Output predetermined data to and return to S107 (S135,
S137). The processes of S103 to S137 are repeated while the main switch is on.

Next, the strobe zoom operation and the light emission operation of the external zoom strobe 50 will be described with reference to FIGS.
This will be described with reference to the flowchart shown in FIG. This operation is performed by the flash C mounted on the external zoom flash 50.
It is executed by the PU 51. The external zoom strobe 50 is assumed to be attached to the accessory shoe of the camera body 10.

When the power of the external zoom strobe 50 is turned on, the strobe CPU 51 executes this main routine. First, the initialization of the hardware side such as the level of each port and the initialization of the software side are executed, and the 5-minute timer is activated (S301, S303).
The 5-minute timer is a timer for turning off the power to save power when there is no operation for 5 minutes after the power is turned on.

Next, the power supply circuit 57 and the booster circuit 59 are turned on to start charging the main capacitor C, and each switch state is input (S305, S307, S307). These switches are a dimming mode such as TTL / manual dimming, a changeover switch for switching auto / manual zooming, and the like. The flash CPU 51 selects a mode or the like according to these switch states.

Then, it is checked whether or not there is communication from the camera, and when there is no communication and the 5-minute timer has not timed out, the process returns to S305. If there is no communication and the 5-minute timer has timed up, the power is turned off. Then, the process is terminated (S309, S311, S305 or S309, S311, S313). The communication with the camera is the communication in S131 and S137, and the main C
It is executed by the PU 11 every 100 ms.

If there is communication from the camera within 5 minutes, the 5-minute timer is reset and the communication mode with the camera is checked (S317, S325). Communication mode 1 is communication from the camera to the strobe, and communication mode 2 is communication from the strobe to the camera. In communication in the communication mode 1, predetermined data (focal length f, zoom mode, light emission mode, dimming mode, etc.) is input from the camera (S31).
9). Next, in the zoom mode, the irradiation angle corresponding to the focal length f (angle of view) of the photographing lens is calculated based on the input camera data, and the light emitting unit is zoomed based on the calculation result (S321, S323). . Does nothing if not in zooming mode. Then, the corresponding focal length f etc. are displayed on the external LCD panel 69 and S30 is displayed.
Return to 5.

Next, S305 to S309, S315, S
After 317 and S325, the processing of communication mode 2 in S327 is executed. In S327, the charging completion data, the trailing curtain
Data such as front curtain synchronization data or slave synchronization data, auto / manual dimming data, and TTL metering data is output to the camera. Then, a predetermined display is performed on the external LCD panel 69, and the process returns to S305.

When the communication mode is neither mode 1 nor mode 2, S305 to S309, S315, S3
After S17 and S325, the process proceeds to S331. In S331,
Prepare for light emission operation. Then, it is checked whether or not the light emission trigger signal is input (S333). When the light emission trigger signal is not input, it is checked whether there is communication from the camera, and when there is communication, S315.
Return to (S335, S315), and if there is no communication but the 5-minute timer has not timed up, return to S333 (S335, S337, S333), there is no communication and 5
When the minute timer is up, the power is turned off to end the processing (S335, S337, S33).
9).

When a light emission trigger signal is input, a light emission trigger signal is output to the light emission control circuit 63 to cause the light emitting tube 61a to emit light (S333, S341). Here, the main CPU 11 on the camera side outputs a light emission stop signal to the external strobe device 50 when detecting that the quench signal has been output from the DPU 13 in the light emission processing on the strobe side, as described above. When this flash stop signal is input, the flash CPU 51 stops the flash control circuit 63 from flashing,
That is, the dimming bit that causes the LCD panel 69 to perform dimming is set to "1", but if there is no dimming, the dimming bit is set to "0" and the LCD panel 69 After a predetermined display on the screen, the process returns to S305 (S34
3, S345, S329 or S343, S347, S
329).

Next, the strobe zoom process in S323 will be described with reference to the subroutine shown in FIG. First, the current focal length information of the power zoom lens 50 input from the body 10 is read out, and zoom position data corresponding to this focal length is set (S401, S).
403). Then, the current shooting distance information of the power zoom lens input from the body 10 is read and it is checked whether this shooting distance is smaller than a specified value (S40).
5, S407). If it is larger than the specified value, the arc tube 61 is moved to the zoom position set in S403 and the process returns (S407. S411).

If it is smaller than the specified value, the zoom position data set in S403 is corrected to the wide angle side in order to widen the irradiation angle (S407, S409). Then, based on the zoom position data corrected to the wide angle side, the movable light emitting unit 61 is driven and the process returns (S411). By this processing, the irradiation angle is expanded and the shooting range in close-up shooting can be covered.

As described above, when stroboscopic photography is performed using the camera body 10, the zoom lens 70 and the external zoom strobe 50, the external zoom strobe 50 will operate in accordance with the focal length of the zoom lens 70 at a normal photographing distance. Zoom in. In addition, in short-distance shooting, zooming is performed so that it is wider than the irradiation angle according to the focal length, so vignetting of strobe light due to parallax between the shooting range and the irradiation range is eliminated. Further, since the reflected light per unit area from the subject due to the strobe light is weakened, the guide number is substantially reduced, the control range of the TTL light emission control in close-up photography is widened, and overexposure can be prevented.

Zooming to the wide-angle side during short-distance shooting may be performed up to the position where the widest irradiation angle is obtained, or when stepwise zooming control is performed, zooming for one or several steps may be performed. Accordingly, a configuration may be adopted in which zooming is performed in stages toward the wide irradiation angle side. Further, although the present invention has been described with reference to the embodiment applied to a zoom strobe that is attached to and detached from a single-lens reflex camera, the present invention can also be applied to a lens shutter type camera and a single-lens reflex camera having a built-in zoom strobe. In the case of a lens shutter type camera, the main CPU 11 is caused to perform the processing executed by the flash CPU 51.

[0049]

As described above, according to the present invention, the zoom strobe that zooms in accordance with the focal length of the taking lens is located on the wide-angle side of the irradiation angle corresponding to the focal length when the taking distance is smaller than a prescribed value. Since it zooms, the irradiation range is expanded and the shooting range can be sufficiently covered. Further, since the strobe reflection light per unit area from the subject becomes weak, the range of light amount control in close-up photography is widened.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a control circuit of a single-lens reflex camera to which the present invention has been applied.

FIG. 2 is a block diagram showing an embodiment of a control circuit of an external zoom strobe to which the present invention is applied.

FIG. 3 is a block diagram showing a configuration of a main part of a power zoom lens mounted on a single-lens reflex camera to which the present invention has been applied.

FIG. 4 is a flowchart showing a main routine regarding a main operation of the same-eye reflex camera.

[Figure 5]

FIG. 6 is a flowchart showing a main routine relating to a main operation of an external zoom strobe.

FIG. 7 is a flowchart showing a subroutine regarding power zoom processing of the external zoom strobe.

[Explanation of symbols]

 10 Camera body 11 Main CPU 13 DPU 15 IPU 19 Built-in flash circuit 50 External zoom flash 51 Flash electronic CPU 61 Light emitting part 63 Flash control circuit 67 Flash zoom motor 70 Zoom lens 71 Lens CPU 89 Zoom code plate 91 Distance code plate

Claims (3)

[Claims] 1. A zoom strobe having an irradiation angle varying device, comprising: information input means for inputting focal length information and photographing distance information of a photographing lens; and the irradiation according to the focal length inputted by the information input means. And an irradiation angle control means for driving the angle changing device, wherein the irradiation angle control means is wider than the irradiation angle corresponding to the focal length when the photographing distance input by the information input means is smaller than a predetermined value. A zoom strobe characterized by driving an irradiation angle changing device to the side. 2. The zoom strobe according to claim 1 is detachably formed on an accessory shoe of a camera, and the information input means is provided with the focal point and the photographing distance via a contact group provided on the accessory shoe. Zoom strobe characterized by inputting. 3. A camera having a built-in strobe having an irradiation angle varying device, the focal length detecting means for detecting a focal length of a photographing lens, and the irradiation according to the focal length detected by the focal length detecting means. An irradiation angle control means for driving the angle changing device and a photographing distance detection means for detecting a photographing distance of the photographing lens are provided, and the irradiation angle control means is such that the photographing distance detected by the photographing distance detecting means is smaller than a predetermined value. A camera with a built-in zoom strobe, characterized in that when it is small, the irradiation angle changing device is driven to the wide-angle side.