JP2000321657A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera which executes exposure while preventing the decrease in the light quantity of a subject image to a film with the camera which allows the check of the subject image equal to the subject image taken on a film right after exposure. SOLUTION: This camera has a finder to monitor and display the subject image taken on the film 5 by branching part of the luminous flux (image) formed by a photographic lens system 1 by a pellicle mirror 3 movable upward and down and receiving the light to an image taking element 10 and has phase difference AF control and image monitor function. When the luminous of the subject is low in accordance with the result of metering, the camera makes exposure by preventing the decrease of the light quantity to the film by upwardly moving the pellicle mirror 3 and monitors and displays the picked up subject image just before the exposure during the exposure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver halide film camera having an image pickup device, and more particularly to a camera in which a decrease in the amount of light to a film due to a divergence of a light beam from a photographic lens system to the image pickup device is improved.

[0002]

2. Description of the Related Art Usually, a camera for taking a photograph using a silver halide film (hereinafter, referred to as a film) involves development and printing, so that the photographed photograph cannot be confirmed on the spot. Therefore, an image pickup device such as a CCD is provided in the viewfinder, a part of the light beam of the photographing optical system of the camera is branched and received, and the image pickup device takes an image almost at the same time as the exposure. There is proposed a camera that can store and play back images and check the captured image on the spot.

For example, Japanese Patent Application Laid-Open No. Hei 10-142885 discloses that a light beam passing through a taking lens system is divided into two by a half mirror, one of which is guided to a film and exposed, and the other is guided to an image pickup device such as a CCD. I have an image.

Japanese Patent Laid-Open Publication No. Hei 8-254751 discloses a camera which uses a film and is provided with a normal optical viewfinder. There is disclosed a technique for bringing the down state. The pellicle mirror is normally configured to be in a down state, and when the brightness of the subject is low or cannot be assisted by strobe light, the mirror is raised to prevent a decrease in the exposure amount to the film.

[0005]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No.
In the technique disclosed in Japanese Patent No. 142684, the light beam from the photographing lens system is split by a half mirror in order to capture a subject image to be photographed by the image pickup device, so that the amount of light reaching the film is reduced by half. In this case, the shutter speed becomes slower to obtain an appropriate exposure, and camera shake is likely to occur.

Further, in the technique disclosed in Japanese Patent Application Laid-Open No. Hei 8-254751, the mirror is raised in the same manner as a conventional quick return mirror depending on the photographing conditions, so that a blackout in which the subject image viewed from the optical finder disappears when exposure is performed. appear.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a camera capable of confirming a subject image equivalent to that taken on a film immediately after the photographing, and exposing the film while preventing a decrease in the amount of the subject image on the film. .

[0008]

According to the present invention, there is provided a photographing optical system, and a half mirror for dividing a light beam from the photographing optical system into a light beam to a film surface and a light beam to an image sensor. A camera having an insertion / removal mechanism for inserting / removing the half mirror into / from the light beam from the photographing optical system is provided.

Further, a photographing optical system for forming a subject image on a film surface, an image pickup device for acquiring image data corresponding to the subject image, and a light beam from the photographing optical system for transmitting the light beam to the film surface. Provided is a camera having a light splitting means for splitting a light flux and a light flux to the image pickup device, and an insertion / removal mechanism for inserting and removing the light splitting means in the light flux from the photographing optical system.

[0010] When the camera configured as described above is set to the image confirmation mode, the half mirror is kept in the down state, and the imaging of the image sensor and the exposure of the film are performed. The exposure is carried out by raising the half mirror according to the exposure condition according to (1), the incident light amount on the film 5 is effectively used, and a substantial decrease in ISO sensitivity is prevented.

A first mode (image confirmation mode) or a second mode (normal photographing mode) can be selected. Exposure values suitable for these modes are calculated, and exposure conditions suitable for each mode are calculated. Shoot.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a schematic configuration example in an optical system of a camera according to a first embodiment of the present invention, and will be described.

A camera shown in FIG. 1A has a photographic lens system 1 serving as a photographic optical system for forming an image of a subject (not shown).
A diaphragm 2 for controlling an exposure amount, and a photographing lens system 1
And a pellicle mirror 3 composed of a half mirror that can move up and down to split a light beam (subject image), and a focal plane shutter (hereinafter, referred to as a shutter) provided near the film surface of the film 5
4, a condenser lens 6 provided at a position approximately equivalent to the film surface, a total reflection mirror 7 for totally reflecting the light beam passing through the condenser lens 6, and a re-imaging of the light beam reflected by the total reflection mirror 7 Lens 8, a pupil division LCD 9 comprising a liquid crystal shutter as pupil division means (mask means) for detecting a phase difference, and C
It is composed of an imaging device 10 composed of a CD or the like.

The up / down operation of the pellicle mirror 3 is performed by an insertion / removal mechanism including a mirror drive mechanism 42 controlled by the mirror drive circuit 25. With this operation, the pellicle mirror 3 is inserted into and removed from the optical path of the photographing lens system 1.

FIG. 1B shows a configuration example of an electronic view finder (hereinafter, referred to as a finder). The finder includes an image pickup device 10 and a monitor unit 11 for displaying a subject image serving as a display means. The monitor unit 11 includes a backlight (LED) 12 for illuminating a monitor, and an LCD display. And an eyepiece 14 for forming a monitor image on the photographer's eye 15. The pellicle mirror 3 in the present embodiment transmits about 50% of the light amount to the film surface side in the down state, and reflects about 50% of the light amount to the upper finder side. Of course, it is not limited to this ratio.

FIG. 2 shows three possible states of the pupil division LCD 9 for pupil division. FIG. 2 (a)
Shows a transmission pattern of the pupil division LCD 9 when performing the phase difference autofocus (AF) control. In this case, an elliptical portion on the right side of the pupil division LCD 9 is a transmission region 9a through which a light beam passes, and a hatched portion is a light shielding region 9b. In this pattern, the light beam on the right side of the relay lens 8 is transmitted. FIG. 2B shows a pupil division L for performing AF control in the same manner.
3 shows a transmission pattern of CD9. In this case, the pupil division LCD
The elliptical part on the left side of 9 is a transmission area 9c through which the light beam passes.
The shaded area is the light-shielding area 9d. In this pattern, the light beam on the left side of the relay lens 8 is transmitted. FIG.
(C) shows a transmission pattern of the pupil division LCD 9 when used as an electronic viewfinder. In this case, in order to display the entire screen to be photographed, the entire area is in a transparent state. Note that these transmissive regions are not limited to be arranged on the left and right, but may be arranged vertically.

FIG. 3 is a block diagram showing a system configuration of the camera according to the present embodiment. This camera is equipped with a CPU 21 for performing sequence control of the entire camera. The CPU 21 includes an image data controller 22
, Aperture drive circuit 23 and focus drive circuit 24
, Mirror drive circuit 25, pupil division LCD drive circuit 26
, Shutter drive circuit 27, shutter charge circuit 2
8, a film drive circuit 29, a photometric circuit 30, and a power switch (SW) 31 for turning on / off a power supply
, An image confirmation mode switch 32, a first release switch (1RSW) 33, and a second release switch (2R
SW) 34 is connected.

The image data controller 22 includes a CP
The image sensor 10 in response to the control signal output from U21
Drive control of the peripheral circuits. First, the timing generation circuit 35 is controlled to transmit a timing signal to the
/ D converter 36. The analog subject signal from the image sensor 10 is amplified by an amplifier (AMP) 37, A / D converted by an A / D converter 36, and input to the image data controller 22 as a subject image (image data). Further, the image data controller 22 temporarily stores the input image data in the image memory 38. The image monitor driver 39 controls the driving of the image monitor 13 and displays the image data fetched from the storage memory 38 as a subject image. This image monitor 13 has C
The backlight 12 controlled by the PU 21 is provided.

The aperture driving circuit 23 includes an aperture driving mechanism 4
By controlling 0, the diaphragm 2 is driven (a diaphragm operation and an opening operation). The focus drive circuit 24 controls the focus drive mechanism 41 to focus the photographing lens system 1. The mirror driving circuit 25 drives the mirror driving mechanism 42 to perform the up / down operation of the pellicle mirror 3.

The pupil division LCD drive circuit 26 drives the pupil division LCD 9 described above. The shutter charge circuit 28 controls the shutter charge mechanism 43 to perform a spring charge in preparation for the operation of the shutter 4. In the present embodiment, the front curtain and the rear curtain of the shutter 4 use an elastic body such as a spring as a driving source. After photographing, the front curtain and the rear curtain have completed traveling, and the driving source is used for the next photographing. It is necessary to charge the spring. The film driving circuit 29 performs film feeding and rewinding of the film 5 by the film driving mechanism 44.

The image confirmation mode SW 32 is a switch for setting a mode in which a subject image photographed on the film 5 is displayed on a monitor immediately after photographing. When the switch is on, an image for displaying the photographed subject image on the image monitor 13 is displayed. In the confirmation mode (first mode) and the OFF state, the mode is switched to the normal mode (second mode) in which no image is displayed. Also one
RSW33 is turned on by the first stroke of the release button,
The 2RSW 34 is turned on by the second stroke of the same release button.

Next, the main flow operation of the camera according to the first embodiment will be described with reference to the flowchart shown in FIG. First, the power SW 31 is turned on and the camera is started. Along with the activation, the image sensor 10 is driven, and the light flux (subject image) formed by the photographing lens system 1 is sequentially taken into the image memory 38 as image data (step S1). The image data is sequentially read from the image memory 38, and the subject image is displayed on the image monitor 13 in which the backlight 12 is turned on while sequentially updating the image in time series (step S2). With such a display method, a moving image is displayed on the image monitor 13.

Then, it is determined whether or not the 1RSW 33 has been turned on (step S3). In this determination,
If the 1RSW 33 remains off (NO), the process returns to step S1, and the image of the subject captured by the image element 10 is continuously displayed on the image monitor 13. However, if it is in the ON state (YES), focus detection is performed (step S4).

Here, a subroutine for focus detection will be described with reference to the flowchart shown in FIG. First, as shown in FIG. 2A, the pupil division LCD 9 has a light-transmitting area formed on the right side and a light-shielded state on the left side (step S31). Then, the image pickup device 10 is driven and the CPU
Image data is loaded into the memory 21 (step S32). next,
As shown in FIG. 2B, the pupil division LCD 9 switches the left side to the translucent area and the right side to the light-shielded state (step S3).
3). Then, the image pickup device 10 is driven, and image data is taken into the CPU 21 (step S34). After these images are taken, the pupil division LCD 9 is set to L as shown in FIG.
Transparent state over the entire area of the CD (step S3
5). Based on the image data respectively taken from the left and right sides of the pupil division LCD 9, the correlation calculation of the phase difference AF is performed by a predetermined algorithm to select the main subject position and
After obtaining the defocus amount at the position of the main subject (step S36), the process returns. In addition, pupil division LCD
The image data from 9 may be fetched first from either the left or right.

Next, the process returns to the main flow of FIG. The photographing lens system 1 is adjusted according to the defocus amount obtained in step S4, and focus driving is performed (step S5). After focusing, the photometric circuit 30 is driven to perform photometry (step S6). Exposure calculation is performed using the obtained photometric result (step S7). Here, the set value of the diaphragm 2 (the amount of narrowing) and the integration time of the image sensor 10 are obtained.

From the result of photometry performed by the photometry circuit 30, the brightness of the subject to be photographed in the image confirmation mode is too low.
If the CPU 21 determines that proper photographing cannot be performed, the CPU 21 forcibly puts the pellicle mirror 3 in the up state or warns the photographer that the setting mode is inappropriate.

As will be described later, in the camera of the present invention,
There are two modes, an image confirmation mode and a normal mode. In the image confirmation mode, the pellicle mirror 3 is exposed while the pellicle mirror 3 is in the down state.
Is exposed in the up state. Here, the pellicle mirror 3
Since the amount of light incident on the film 5 is different between the state in which the image is raised and the state in which the image is lowered, the exposure calculation results are different in these modes. In this exposure calculation, calculation results may be obtained for both modes.
Before the 1RSW 33 is turned on, that is, before the step S2, the operation of the image confirmation mode SW 32 is set to one of the modes. Therefore, it is sufficient to perform the exposure calculation of only one of the selected modes. The calculation need not be performed.

Next, it is determined whether or not the 2RSW 34 has been turned on (step S8). In this judgment, 2
If RSW 34 is off (NO), 1RSW 33
It is determined whether or not remains in the ON state (step S9). 1
If the RSW 33 remains on (YES), it is considered that there is an intention to take an image, and the system waits until the 2RSW 34 is turned on. During this time, the image sensor 10 is driven to perform image data processing as in steps S1 and S2. Are sequentially taken into the image memory 38 (step S10). Then, the image data is sequentially read from the image memory 38, and a subject image to be a moving image is displayed on the image monitor 13 (step S11).

In step S8, 2RS
If W34 is turned on (YES), the aperture driving mechanism 4
Aperture 2 is narrowed by 0 (step S12). Thereafter, it is determined whether or not the image confirmation mode has been set (step S13). In this determination, the image confirmation mode S
If W32 is in the ON state, that is, if the image confirmation mode is set (YES), the image is exposed as it is (step S).
15). In the image checking mode, the photographing on the film 5 and the image capturing with the image sensor 10 are performed at the same time.
The pellicle mirror 3 needs to be photographed in a down state.

However, when the image confirmation mode SW 32 is in the off state, that is, in the normal mode, (N
O) Only film shooting is performed, and after raising the pellicle mirror 3 (step S14), exposure (exposure) in step S15 is performed. When the pellicle mirror 3 is down, the amount of light incident on the film 5 is reduced by half. Therefore, in the normal mode, the pellicle mirror 3 is raised, and the amount of light incident on the film 5 is effectively used to substantially reduce ISO.
Prevents reduction in sensitivity.

Here, the exposure operation in step 15 will be described with reference to the flowchart shown in FIG. First, the running of the front curtain of the shutter 4 is started (step S41). It is determined whether or not the image confirmation mode SW 32 is set to the image confirmation mode (step S42).

If it is determined that the image confirmation mode is set (YES), the film exposure timer is reset and started according to the result of the exposure calculation in step S7 (step S43). Next, shutter 4
Is driven, and whether or not the front curtain has been fully opened is detected by a front curtain full-open detection unit (not shown) attached near the front curtain (step S44). However, as another embodiment, a count corresponding to the front curtain running time is set in the timer without using the front curtain full-open detection unit, the end of the count is determined to be the front curtain running completion, and the process proceeds to the next step. You may be able to do it.

In step S44, when a detection signal indicating that the front curtain has been fully opened is obtained (YES), the image sensor 1
The integration of 0 is started (step S45). At the same time, the image sensor integration timer of the image sensor 4 is reset and started (step S46). As the set time of this timer, the result calculated by the exposure calculation in the confirmation mode in step S7 is used.

If the exposure amount is insufficient, a strobe light is emitted using a strobe light emitting circuit (not shown) (step S47). Thereafter, it is determined whether or not the time of the started film exposure timer has expired (step S48). If the time has elapsed (YES), the rear curtain is started (step S49). Step S4 above
It is determined whether or not the time of the image sensor integration timer started in step 6 has elapsed (step S50). If the time has elapsed (YES), the integration of the image sensor 10 is terminated (step S51).

In the determination in step S48,
If the film exposure timer has not expired (N
O), it is determined whether or not the time of the image sensor integration timer has expired (step S52). Here, if the time of the image sensor integration timer has not expired (NO), the process returns to step S48, and it is determined again whether or not the time of the film exposure timer has expired. This is to look at both the film exposure timer and the imaging element integration timer, and decides whether to end integration of the imaging element 10 or start the rear curtain according to the time that has elapsed first.

If the time of the image sensor integration timer has expired (YES), the integration of the image sensor 10 is terminated (step S53). Thereafter, it is determined whether or not the time of the film exposure timer has expired (step S54), and the second curtain is started (step S55).

If the integration of the image sensor 10 is completed in step S51 or the trailing curtain is started in step S55, the image data captured and A / D converted by the image sensor 10 is temporarily stored in the image memory 38. It is stored (step S56). Then, it is determined whether or not the rear curtain has completed traveling by a rear curtain traveling completion detection unit (not shown) attached near the rear curtain of the shutter 4 (step S57).

On the other hand, if it is determined in step S42 that the image confirmation mode is not set and the normal mode is set (NO), the film exposure timer is reset according to the result of the exposure calculation in the normal mode in step S7. Start (step S5
8). Next, the front curtain of the shutter 4 is run, and a front curtain full-open detection unit (not shown) attached near the shutter 4 detects whether the front curtain has been fully opened (step S59). For this detection, a predetermined count may be set in the timer instead of the full-curtain detection section, as described above, and used instead.

If a detection signal indicating that the front curtain has been fully opened is obtained in step S59 (YES), the strobe light 90 is emitted using the strobe light emitting circuit 91 in some cases (step S60). Thereafter, it is determined whether or not the time of the started film exposure timer has expired (step S61). If the time has elapsed (YES), the rear curtain is started (step S6).
2), the process proceeds to step S57, and if the traveling is completed, the process returns.

Next, the process returns to the main flow of FIG. After performing the exposure in step S15, it is determined again whether or not the image confirmation mode SW 32 has been set to the image confirmation mode (step S16). The pellicle mirror 3 that has been moved up is moved down (step S17). Then, the diaphragm drive mechanism 40 opens the diaphragm 2 (step S18), and winds the photographed film 5 (step S19).

Next, it is determined whether or not the image confirmation mode SW 32 has been set to the image confirmation mode (step S2).
0), if the image confirmation mode has been set (YE
S), the image data at the time of shooting is read from the storage memory 38 and displayed on the image monitor 13 (step S21).

The image is displayed on the image monitor 13 and a 5-second timer is operated (step S22).
With the expiration of the timer (step S23),
The displayed subject image at the time of shooting is erased, and the process returns to step S1 to switch to and display moving images sequentially captured from the image sensor 10.

In the present embodiment, the image is displayed immediately after the film has been taken and wound up on the film 5. However, the present invention is not limited to this, and the image can be displayed by operating the operation part at any time. Good.

As described above, according to the present embodiment, an image confirming mode in which a film photographed image can be confirmed and a normal mode in which normal film photographing cannot be confirmed can be selected according to the luminance of a subject to be photographed. Therefore, even when the brightness of the subject is low, it is possible to prevent the subject image from being darkened and the occurrence of camera shake without substantially lowering the film sensitivity (ISO).

In order to give a phase difference to image data formed by the photographing lens system 1 in front of the image pickup device 10,
By arranging the pupil division LCD, it is possible to perform phase difference AF control using the imaging device arranged in the viewfinder, and the processing speed is faster than the contrast control, and the area of the light receiving surface of the imaging device is reduced. Do not increase.

Further, there is no need to separately provide a light detection sensor for AF, a wide AF detection area is secured at low cost, and accurate AF control can be realized.

When the above-described in-focus detection subroutine shown in FIG. 6 is executed, image data obtained from the photographing lens system 1 at this time is simply taken in by the image pickup device and displayed on the image monitor 13 so that the image is distorted. appear. FIG. 7 schematically shows the optical path when the state in which the subject image is formed by the lens is focused on the image disorder, with reference to FIG.

In FIG. 7A, for the sake of convenience, the upper half of the pupil division LCD 9 is shown as being transparent and the lower half is shown as being light-shielded, but in the embodiment, the right half is transparent as shown in FIG. Then, the left half is replaced with light shielding.
The transmitted light beam has an elliptical shape, but for simplicity of description, half of the light beam is shown as transmitted and light-shielded. The image formed by the photographing lens system 1 is incident on the relay lens 8 via a focal point (a surface optically equivalent to the film surface: the position where the condenser lens 6 is disposed). The light transmitted through the upper half of the pupil-divided LCD 9 from the relay lens 8 is transmitted from the optical axis O of the subject image. Pass. The position of the principal ray is the ray 102.

Conversely, as shown in FIG. 7 (b), when the imaged light beam passes through the lower half of the pupil division LCD 9, it is transmitted among the light rays emitted from the optical axis position O of the subject image. The light beam passes between the optical axis O and the light beam 101 'at the maximum angle, and the position of the chief ray is the light beam 102'. Therefore, light emitted from the same position of the subject image is incident on the optical axis position of the image sensor 10. Similarly, in the case of light rays emitted from positions other than the optical axis of the subject image, the image sensor 1
An image is formed at the same position other than the 0 optical axis.

Therefore, in the in-focus state as shown in FIGS. 7A and 7B, since the image data incident from both the left and right sides of the relay lens 8 match, these image data are sequentially displayed on the image monitor. Even if the image is displayed on the screen 13, no image disturbance occurs. However, as shown in FIGS. 7C and 7D,
When the image is out of focus (out-of-focus state), for example, when the image is focused behind the image sensor, that is, when it is a so-called back focus, in FIGS.
103 '. Therefore, each ray emitted from the optical axis position O of the subject image and passing through the left and right of the relay lens 8 does not form an image on the optical axis position of the image sensor 10,
The light is shifted left and right on the light receiving surface of the image sensor 10.

Therefore, when the image data is sequentially displayed on the image monitor in the out-of-focus state, the image is shaken on the image monitor 13 to make it hard to see.

As a countermeasure against this, when focus detection is being performed, that is, when light is being shielded, the display of the image data read from the image memory 38 immediately before the light is shielded is maintained on the image monitor 13 so that the light shielding ends. By switching to the image data stored later, the display image temporarily becomes a still image, but it is possible to prevent the display image from flickering or becoming dark.

In the technique described in Japanese Patent Application Laid-Open No. Hei 8-254751, if the pellicle mirror moves up and down during photographing, blackout occurs in which the subject image disappears from the optical finder during exposure. In particular, blackout cannot be avoided with such a configuration.
Also in the present embodiment, the same occurs when the normal mode is selected and the pellicle mirror 3 is moved up and down.

Therefore, in this embodiment, when the normal mode has been set when the setting of the image checking mode is checked in step 13, the pellicle mirror 3
The image of the subject formed by the photographing lens system 1 is displayed and maintained on the image monitor 13 immediately before the image is raised, and the display is switched to the image of the subject captured after the pellicle mirror 3 is lowered. With such a process, the execution period of the exposure calculation and the up-down period of the mirror are both extremely short, so that even if the subject image displayed during this period is a still image, it can be accepted without any particular discomfort. Blackouts that could not be avoided with technology can be avoided.

Next, FIG. 8 shows a schematic configuration example of a camera according to a second embodiment of the present invention and will be described. This camera has, as an optical system configuration, a photographing lens system 51 that forms a subject image from the incident direction of a light beam, a diaphragm and a diaphragm mechanism 52 disposed in the photographing lens system 51, and an up / down mechanism. Half mirror (first half mirror) 5
3 and a main mirror (second half mirror) 5 that can be moved up and down with a half mirror at a substantially central portion.
4, a fall plane shutter (hereinafter, referred to as a shutter) 55, and a film 56. further,
The subject image split by the main mirror 54 enters an optical finder 57. This optical finder 57 is
It is composed of a focusing plate 58, a pentaprism 59, and a finder eyepiece optical system 60.

The photographing lens system 51 includes a combination of a positive (convex) lens 51a and a negative (concave) lens 51b. Of course, a zoom function may be provided. Also, as in the above-described embodiment, a C for capturing a subject image equivalent to a subject image photographed on a film as image data.
The imaging device 62 includes a CD or the like. Part of the subject image reflected by the half mirror 53 is formed by an imaging lens system 61.
Incident on the image sensor 62 through Note that a prism, a beam splitter, or the like may be used instead of the half mirror 53. A sub-mirror 63 is attached to the center rear portion of the main mirror 54, and the sub-mirror 6
A separator optical system 62 that divides the light beam reflected by 4 into two and a line sensor 65 that receives them are arranged. The sub-mirror 63, the separator optical system 64, the line sensor 65, and the like constitute a focus detection device using a known phase difference method.

This camera has an electric circuit configuration as follows:
Zoom / focus drive circuit 6 for driving the photographing lens system 51
6, an aperture driving circuit 6 for driving the aperture and the aperture mechanism 52
7 and an image sensor driving circuit 68 for driving the image sensor 62
A mirror driving circuit 69 for driving the half mirror 53 and the main mirror 54 up and down, a line sensor driving circuit 70 for driving the line sensor 65,
A shutter drive circuit 71 for driving the shutter 55, a film drive circuit 72 for driving a film feeding mechanism (not shown) for winding and rewinding the film 56, and predetermined information in a magnetic recording layer provided in the film 56. A magnetic head 73 for recording, a magnetic head driving circuit 74 for driving the magnetic head 73, a strobe circuit 75 serving as auxiliary light, a power SW 76 for supplying power,
The camera is provided with a first release switch (1RSW) 77, a second release switch (2RSW) 78, and a non-volatile memory 79 that is detachably attached to the camera body and stores rewritable electronic images and the like.

Further, a signal processing circuit 80 for performing image processing including digitization of an analog video signal detected by the imaging element 62, an image memory 81 for storing processed image data, and displaying these as a subject image. And an image monitor 82 composed of a liquid crystal (LCD). These circuits are connected by a data bus line 83.
It is connected to the CPU 84 that controls each circuit, and transmits and receives data and control signals. Also in this embodiment, the CPU 84 is provided with an image confirmation mode switch 85 for setting a mode in which a subject image equivalent to the photographed image is displayed on the image monitor 82 after film photographing.

Next, the photographing operation of the camera of this embodiment will be described with reference to the flowchart shown in FIG.

Next, an exposure calculation is performed using the photometric value output from the image sensor 68 (step S74), and exposure conditions (shutter speed, aperture value, imaging time, etc.) are calculated.

In this embodiment, as in the first embodiment, the CPU 84 determines from the photometry result that the brightness of the subject to be photographed is too low in the image confirmation mode to perform proper photographing. In this case, the half mirror 53 may be forcibly brought into the up state, or a warning that the setting mode is inappropriate may be given to the photographer.

Next, a subject image equivalent to that taken on the film 56 from the image pickup device 51 is taken (step S75).
The subject image is temporarily stored in the video memory 81 from the image sensor 51, read out from the video memory 81, and displayed on the image monitor 82. The displayed subject image is sequentially updated with the subject image newly incident on the photographing lens system 51 (step S76).

Then, it is determined whether or not the 2RSW 78 has been turned on (step S77). In this judgment, 2R
If the SW 78 has not been turned on (NO), the process returns to step S75, and the subject image displayed on the image monitor 82 is updated. Therefore, it is displayed here as a moving image. When the 2RSW 78 is turned on (YE
S), it is determined whether or not the image confirmation mode has been selected (step S78).

If it is determined that the image confirming mode has been set (YES), the diaphragm driving circuit 67 controls the diaphragm 52.
Are narrowed down (step S79). Thereafter, the main mirror 54 is raised (step S80), and the shutter 55 is driven to expose the film 56 and
8 are simultaneously performed (step S81).
When the exposure and the capture of the image are completed, the main mirror 43 is lowered (step S82).

On the other hand, if it is determined in step S78 that the image confirmation mode has not been set (NO) and the mode is the normal mode, the aperture 52 is narrowed down (step S83), and then the main mirror 54 is moved. An up state is set (step S84). Subsequently, the half mirror 53 is brought down (step S85). Thus, there is no component other than the shutter 55 on the optical path from the taking lens system 51 to the film 56.

Then, exposure is performed, and the subject image is
6 is exposed (step S86). After this exposure,
The main mirror 54 is lowered (step S87),
The half mirror 53 is raised (Step S88).

At the time of this exposure, since the half mirror 53 is in the down state, no image can be taken in from the image sensor 62. Therefore, when blackout is avoided in the present embodiment, the display of the subject image captured immediately before the half mirror 53 goes down is displayed on the image monitor 82.
And switching to the subject image captured after the half mirror 53 is raised. After the photographing in the image confirmation mode up to the step S82 or the photographing in the normal mode during the step S88, the aperture 52 is returned from the narrowed state to the open state (step S89). Then, the photographed film 56
Is wound up (step S90). Next, it is determined whether or not the image confirmation mode has been set (step S9).
1). If the image confirmation mode has been set (YE
S), the image data at the time of shooting is read out from the image memory 81 and displayed on the image monitor 82 (step S92), and the process returns. In the case of the normal mode (NO), the process returns without displaying.

Next, FIG. 10 shows a schematic configuration example of an optical system of a camera according to a third embodiment of the present invention, and will be described. The camera of the present embodiment is provided with a camera shake preventing mechanism for preventing camera shake at the time of shooting in the camera of the above-described first embodiment. The same reference numerals are given to the same components other than the above, and the description is omitted.

As shown in FIG. 10, a blur preventing lens 86 is arranged behind the photographing lens system 1, and a blur preventing mechanism 87 for parallel eccentricity of the lens is provided. Also, a strobe 90 used as an auxiliary light when the subject has low brightness.
And a strobe light emitting circuit 91.

In this blur prevention method, the light flux formed by the photographing lens system 1 is moved (parallel eccentric) by moving the blur prevention lens 86 in a direction perpendicular to the photographing lens optical axis, thereby forming an object image formed on the film surface. This is to correct the displacement. For this blur prevention method, for example, a general method disclosed in detail in JP-A-8-286225 is used.

FIG. 11 is a block diagram showing the system configuration of the camera of this embodiment. This camera has a configuration in which a shake preventing mechanism system is added to the camera of the first embodiment shown in FIG. 3 described above. Here, the characteristic portions of the present embodiment will be described. The same reference numerals as those in FIG. 3 denote the same parts, and a detailed description thereof will be omitted.

In the present embodiment, in addition to the configuration of the first embodiment, a part of the lens of the photographing lens system 1 is used, or a blur is provided behind the photographing lens system 1 to prevent blurring. An anti-shake lens 86, an anti-shake mechanism 87 for moving (parallel eccentricity) the anti-shake lens 86, an anti-shake drive circuit 88 for driving and controlling the anti-shake mechanism 87 according to instructions from the CPU 21, A shake prevention mode switch 89 for setting is provided.

When the shake prevention mode switch 89 is turned on, the mode is switched from the normal mode to the shake prevention mode. When set to the blur prevention mode, a subject image (image data signal) obtained from the image sensor 10 during exposure to film.
, The blur of the formed subject image is detected, and the blur prevention mechanism 87 is controlled to perform blur prevention. In the present embodiment, if the normal shooting mode is set, the flash 90
Is designed to automatically emit light at low brightness, but it is designed to perform flash emission shooting (slow synchro shooting) with a slow shutter speed if the anti-shake mode is set.

Note that the amplifier 37 for amplifying the analog subject signal of the image sensor 10 in the present embodiment is a first amplifier.
Unlike the case of the first embodiment, the amplification factor A can be controlled by a control signal from the CPU 21. This is because, when performing anti-shake imaging, it is necessary to read out an analog subject signal from the image sensor 10 at a fast cycle, and therefore, it is necessary to set the integration control level of the image sensor 10 to a low level. Therefore, it is necessary to increase the amplification factor A of the amplifier 37. That is, when displaying a subject image on the image monitor 13 before shooting, the level of integration control is increased, and in shooting in the blur prevention mode, the level of integration control is lowered and the amplification factor A of the amplifier 32 is increased.

Next, the main flow of the camera of this embodiment will be described with reference to the flowchart shown in FIG. Here, in the photographing operation of the present embodiment, in the case of an operation equivalent to the photographing operation in the above-described first embodiment, the same step numbers are attached, the description thereof is omitted, and only the characteristic portions will be described.

First, the power switch 31 is turned on to activate the camera. With the activation, the image sensor 10 is driven,
The luminous flux (subject image) formed by the photographing lens system 1 is sequentially taken into the image memory 38 as image data (step S1). Thereafter, the same operation is performed from step S2 to step S12, focus detection, photometry, and exposure calculation are performed when the 1RSW is turned on, and the aperture 2 is stopped down when the 2RSW is turned on.

Next, it is determined from the ON / OFF state of the shake prevention mode switch 89 whether or not the shake prevention mode has been set (step S101). Here, if the blur prevention mode is set (YES), exposure is performed while the pellicle mirror 3 is in the down state (step S102). However, if the blur prevention mode is not set, that is, if the camera is in the normal shooting mode (NO), the pellicle mirror 3 is set to the up state (step S14), and exposure is performed (step S103). The pellicle mirror 3 that has been raised is lowered (step S17).

After the photographing in each mode is completed, the diaphragm 2 is opened by the diaphragm driving mechanism 40 (step S).
18) Wind the photographed film 5 (step S)
19), returning to step S1, and repeating the main flow.

Referring to the flowchart shown in FIG.
The exposure in the blur prevention mode according to the third embodiment will be described. First, in performing anti-shake photographing by setting the anti-shake mode, the amplification factor (gain) of the amplifier 36 is set from a normal low magnification to a high magnification in order to obtain image data from the image sensor 10 at a fast cycle ( Step S
111). Next, the first curtain of the shutter 4 is started (Step S112), and the integration of the image sensor 10 is started (Step S113). The time of the interval timer is set (step S114) and started (step S115). The set time corresponds to the integration time of the charge of the image sensor 10 when performing the blur prevention shooting. The interval timer uses a hardware counter inside the CPU 21 and counts in parallel with the sequence control by software.

After the set time has passed, the interval timer generates an interrupt permission signal to the software (step S116). After this interrupt permission signal is generated, the exposure timer of the film is reset and started (step S117). Whether or not the front curtain has been fully opened is detected by a front curtain full-open detection unit (not shown) attached near the front curtain of the traveling shutter 4 (step S118).

However, as another embodiment, a count corresponding to the leading-curtain running time is set in the timer without using the leading-curtain fully-open detecting unit, and the end of the count is determined to be the leading-curtain running completion. You may make it progress to a step.

Thereafter, it is determined whether or not the started film exposure timer has timed out (step S).
119), if the time is up (YES), the second curtain is started (step S120). It is determined whether or not the trailing curtain that has started has completed traveling (step S12).
1). If the running of the rear curtain has been completed (YES), the interrupt processing of the interval timer interrupt is prohibited (step S122), and the interval timer is stopped (step S123). Then, the amplification factor (gain) of the amplifier 36 is returned from the high magnification to the normal low magnification (step S124), and the process returns.

Next, the interrupt processing by the interval timer in step S122 in FIG. 13 will be described with reference to the flowchart shown in FIG. First, when the rear curtain of the shutter 4 is completed, the interval
Inhibit the timer interrupt processing (step S13)
12). Then, the charge obtained by the image sensor 10 is transferred (step S132), and the A / D conversion of the analog subject signal is performed simultaneously with the charge transfer. A / D
The converted image data is temporarily stored in the image memory 38.

Next, the newly obtained image data is compared with the previously obtained image data, and the relative movement amount of the subject (a vector amount on coordinates, etc.) within the screen is calculated (step S134). ). Here, the obtained moving amount of the subject corresponds to the blur amount of the subject image. Then, the moving direction and the moving amount of the blur preventing lens 86 are calculated and obtained from the obtained moving amount of the subject image. Based on the calculation results, under the control of the blur prevention drive circuit 88, the blur prevention mechanism is driven to move the blur prevention lens 86 so as to cancel the blur, so that the blur of the subject image is eliminated. The blur correction is performed (step S135).

Then, the integration of the image pickup device 10 is started (step S135). An interval timer is started (step S136). After the set time of the interval timer elapses, an interrupt permission signal is generated for the software (step S1).
37), return.

Next, with reference to a flow chart shown in FIG. 15, a description will be given of a normal photographing mode in which blur prevention is not performed in the present embodiment.

First, the running of the front curtain of the shutter 4 is started (step S141). If the normal photographing mode has been set, the exposure timer of the film is reset and started according to the result of the exposure calculation in step S74 (step S142). Next, the front curtain of the shutter 4 is run, and whether or not the front curtain has been fully opened is detected by a front curtain full-open detection unit (not shown) attached near the shutter 4 (step S143). As described above, this detection may be performed by setting a predetermined count in a timer instead of the front curtain full-open detection unit.

Then, the strobe light 90 set to automatic light emission in accordance with the luminance of the subject is caused to emit light (step S14).
4). However, when the luminance of the subject is large, the light may not be emitted. Thereafter, it is determined whether or not the time of the started film exposure timer has expired (step S145). If the time has elapsed (YES), the trailing curtain is started (step S146), and then the trailing curtain runs. It is determined whether or not has been completed (step S147),
If the traveling is completed (YES), the routine returns.

As described above, according to the embodiment, the camera using the silver halide film is provided with the image sensor in the viewfinder so that the photographed image of the photographed photograph can be immediately confirmed on the spot. In a camera equipped with a display monitor, the pellicle mirror (half mirror) arranged in front of the film is shot down with the pellicle mirror (half mirror) down according to the brightness of the subject, and the pellicle mirror is shot in an image check mode in which the shot image can be checked. Can be selected to shoot in the normal mode in which the image is raised and the shooting is performed. When calculating the exposure condition of the subject, calculation is performed for each of the image confirmation mode and the normal mode, and appropriate exposure can be performed for each.

Also, since an image sensor and an image memory are provided and the image is constantly updated to a new object image, the image of the object immediately before exposure is stored in this image memory, and this object image is displayed during the exposure period. In advance, by rewriting the subject image formed after the mirror is lowered, it is possible to eliminate blackout in which the subject image disappears momentarily from the finder at the time of exposure caused by raising the pellicle mirror in the normal mode.

In order to give a phase difference to the image data captured by the taking lens system in front of the image sensor, the pupil division LC
D, a rotatable light-shielding plate, a fly-eye lens in which a number of convex lens rows are arranged, or a relay lens divided into a plurality of convex portions, thereby using an image sensor arranged in a finder. As a result, the phase difference AF control can be performed, the processing speed is faster than the conventional contrast control, and it can be realized without increasing the area of the light receiving surface of the image sensor. There is no need to separately provide a light detection sensor, a wide AF detection area is secured at low cost, and accurate AF control can be realized.

Further, a movable half mirror is provided in front of a pellicle mirror of a camera having an optical finder, and a subject image is branched and irradiated to an image pickup device.
It has the functions of both a conventional optical viewfinder camera and an electronic viewfinder camera, so even if you take a picture as before, you can check the same subject image immediately after taking a picture. . Further, even when shooting is performed in a normal shooting mode, shooting can be performed without blackout in the electronic viewfinder.

Further, a blur prevention system is provided. During the exposure period, the image data newly obtained by the image pickup device is compared with the image data obtained last time, and the relative movement amount of the subject within the screen is calculated. (A vector amount on the coordinates, etc.) is obtained by calculation, and the blur amount of the subject image is detected to realize the blur prevention.

Although the above embodiment has been described, the present invention includes the following invention.

(1) A photographing optical system for forming a subject image on a film surface, an image pickup device for acquiring image data corresponding to the subject image, and a light beam from the photographing optical system onto the film surface A camera comprising: a light splitting unit that splits the light beam into the light beam and the light beam to the image pickup device; and an insertion / removal mechanism that inserts / removes the light beam into / from the light beam from the imaging optical system. This corresponds to the first embodiment and the second embodiment. As an effect of this, by inserting the spectroscopic means into the light beam of the photographing optical system, it is possible to display and confirm a subject image equivalent to a subject image to be film-photographed by the imaging device immediately after photographing. Further, by retracting the spectroscopic means from the light beam into the photographing optical system, it is possible to prevent a decrease in the amount of light incident on the film, thereby preventing a substantial decrease in ISO sensitivity.

(2) Input means for selectively inputting a first mode in which imaging by the image sensor and filming on film are performed simultaneously, and a second mode in which imaging by film is performed without imaging by the image sensor. When the first mode is selected and input by the input unit, the insertion / removal mechanism inserts the spectroscopic unit into the light beam from the photographing optical system, and the second mode is input by the input unit. The camera according to the above item (1), wherein when is selected, the spectroscopic unit is separated from the light beam from the photographing optical system to enable photographing. This corresponds to the first embodiment and the second embodiment. As an effect of this, an image confirmation mode or a normal mode can be set by operating a selection means (image confirmation mode switch) for inserting and removing the spectroscopic means into and out of the light beam of the photographing optical system. , A subject image equivalent to the subject image photographed by the film using the image sensor can be displayed and confirmed immediately after photographing. Further, by retracting the spectroscopic means from the light beam into the photographing optical system, it is possible to prevent a decrease in the amount of light incident on the film, thereby preventing a substantial decrease in ISO sensitivity.

(3) The apparatus according to the above item (1), further comprising a photometer for measuring the brightness of the subject, wherein the insertion / removal mechanism controls the insertion / removal operation of the spectral unit based on an output value of the photometer. camera. This corresponds to the first embodiment and the second embodiment. If it is determined from the result of photometry performed by the photometry circuit that the brightness of the subject to be photographed is too low in the image confirmation mode and proper photographing cannot be performed, the pellicle mirror or half mirror is forcibly brought up, The photographer is warned that the setting mode is inappropriate.

(4) The above-mentioned insertion / removal mechanism enables the photographing in a state where the spectral means is inserted into the light beam from the photographing optical system when the subject luminance is larger than a predetermined value. The camera according to. This corresponds to the first embodiment and the second embodiment. As an effect of this, photographing is performed in the image confirmation mode, and a subject image equivalent to the photographed subject image can be confirmed immediately after photographing.

(5) The above-mentioned insertion / removal mechanism makes it possible, when the subject luminance is smaller than a predetermined value, to take a picture in a state where the spectral means is separated from the light beam from the photographing optical system. The camera according to. This corresponds to the first embodiment and the second embodiment. In the image check mode, when the brightness of the subject to be shot is too low to perform proper shooting, the pellicle mirror or half mirror is raised and normal shooting (normal mode) is performed to reduce the amount of light in the subject image. And camera shake prevention.

(6) photometric means for measuring the brightness of the subject;
Exposure value calculation means for calculating an exposure value based on the output of the photometric means, and a first mode in which imaging by the image sensor and shooting on film are performed simultaneously, or only shooting on film without imaging by the image sensor. Selecting means for selecting one of the second modes, wherein the exposure value calculating means calculates the exposure value for each of the first and second modes, respectively. camera. This corresponds to the first embodiment and the second embodiment. As an effect of this, it is possible to select the first mode (image confirmation mode) or the second mode (normal mode) by operating the selection means (image confirmation mode switch), and the exposure value calculation means is suitable for these modes. The exposure values to be calculated are calculated. These exposure values may be calculated for both modes at the same time, or only the exposure values for the selected mode may be calculated. By this exposure value calculation, shooting can be performed under exposure conditions suitable for each mode.

(7) The camera according to (6), wherein the exposure value is an aperture value, and the aperture value for the first mode is larger than the aperture value for the second mode.

This corresponds to the first embodiment and the second embodiment. As an effect of this, a shooting condition with aperture priority is set.

(8) The above exposure value is the shutter time,
The camera according to (6), wherein the shutter speed for the first mode is longer than the shutter speed for the second mode.

This corresponds to the first embodiment and the second embodiment. As an effect of this, a shooting condition in which the shutter speed is prioritized is obtained.

(9) The pupil dividing means arranged in the light beam from the spectroscopic means to the image sensor, and the photographing based on the output when the light beam split by the pupil dividing means is received by the image sensor. The camera according to the above (1), further comprising a focus state detecting means for detecting a focus state of the optical system.

This corresponds to the first embodiment and the second embodiment. As this effect, phase difference AF of a wide area by the image sensor is realized.

(10) The in-focus state detecting means detects the in-focus state of the photographing optical system based on a phase difference between at least two output signals in the light receiving element region. Camera.

This corresponds to the first embodiment and the second embodiment. As this effect, phase difference AF of a wide area by the image sensor is realized.

(11) The camera according to the above item (9), wherein the pupil dividing means is a mask means for selectively setting a part of the light beam of the imaging optical system to a light transmitting state or a light shielding state. This corresponds to the first embodiment and the second embodiment. This mask means comprises a liquid crystal display device (liquid crystal shutter: pupil division LCD), and selectively transmits or blocks a light beam to a part of the light receiving surface of the image sensor in order to cause the image sensor to detect a phase difference. Or As this effect, phase difference AF of a wide area by the image sensor is realized.

(12) The camera according to the above (11), wherein the mask means comprises a liquid crystal display device. This corresponds to the first embodiment and the second embodiment. The liquid crystal display device
The operation can be controlled electrically and the operation can be performed at high speed.

(13) Display means for displaying the subject image based on the image data acquired by the image pickup device, a first mode for displaying the subject image at the time of shooting with a film, and displaying the image on the display means after shooting. Input means for selecting and inputting a second mode not to be displayed, wherein the insertion / removal mechanism switches the spectroscopic means to a light beam from the photographing optical system when the first mode is selectively input by the input means. When the second mode is selected and input by the input means, the photographing can be performed in a state of being inserted into the camera, and the spectroscopic means can be photographed in a state of being separated from the light beam from the photographing optical system. Camera according to item 1). This corresponds to the first embodiment and the second embodiment. As an effect of this, by inserting the spectroscopic means into the light beam of the photographing optical system, it is possible to display and confirm a subject image equivalent to a subject image to be film-photographed by the imaging device immediately after photographing. In addition, by retracting the spectroscopic means from the light beam to the above-mentioned photographing optical system, it is possible to prevent a decrease in the amount of light incident on the film, and to substantially reduce
Prevents a decrease in SO sensitivity.

(14) Detecting means for detecting the camera shake state, shake preventing means for preventing image shake on the film surface during exposure based on the output from the detecting means, and driving the shake preventing means The first mode and the second
Input means for selecting and inputting the mode of the first mode, wherein the insertion / removal mechanism inserts the spectral means into the light beam from the photographing optical system when the first mode is selectively input by the input means. (1) The photographing can be carried out in a state where the photographing is performed, and when the second mode is selectively inputted by the input means, the spectroscopic means can be photographed while being separated from the light beam from the photographing optical system. The camera according to. The third embodiment corresponds to the third embodiment. As an effect, during the exposure period, the image data newly obtained by the image sensor is compared with the image data obtained last time, and the relative movement amount of the subject within the screen (vector amount on coordinates, etc.) is calculated. , The blur amount of the subject image is detected, and blur prevention is realized.

(15) The detecting means detects the camera shake state based on the output of the image sensor.
The camera according to item 4). The third embodiment corresponds to the third embodiment. As an effect of this, the subject image shot on film is displayed,
An image sensor used also for the phase difference AF can be used as a blur prevention detecting unit.

[0114]

As described in detail above, according to the present invention, it is possible to confirm a subject image equivalent to that taken by film immediately after photographing, and to prevent a decrease in the amount of light of the subject image on the film and expose the camera. Can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration example of an optical system of a camera according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of three possible transmission and light blocking states of the pupil division LCD shown in FIG.

FIG. 3 is a block diagram illustrating a system configuration of the camera according to the first embodiment.

FIG. 4 is a flowchart for explaining a main flow operation of the camera in the first embodiment.

FIG. 5 is a flowchart for describing a focus detection subroutine in a main flow of the first embodiment.

FIG. 6 is a flowchart for describing a subroutine of an exposure operation in a main flow of the first embodiment.

FIG. 7 is a diagram schematically illustrating an optical path when a state in which a subject image is formed by a lens is focused in the first embodiment.

FIG. 8 is a diagram illustrating a schematic configuration example of an optical system of a camera according to a second embodiment of the present invention.

FIG. 9 is a flowchart illustrating a main flow operation of the camera according to the second embodiment.

FIG. 10 is a diagram illustrating a schematic configuration example of an optical system of a camera according to a third embodiment of the present invention.

FIG. 11 is a block diagram illustrating a system configuration of a camera according to a third embodiment.

FIG. 12 is a flowchart illustrating a main flow operation of the camera according to the third embodiment.

FIG. 13 is a flowchart for explaining a subroutine of an exposure operation with blur prevention in a main flow of the third embodiment.

FIG. 14 is a flowchart for explaining an interval timer interrupt in the main flow of the third embodiment.

FIG. 15 is a flowchart for describing a subroutine of an exposure operation without blur prevention in a main flow of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Photography lens system 2 ... Aperture 3 ... Pellicle mirror 4 ... Fall plane shutter (shutter) 5 ... Silver halide film (film) 6 ... Condenser lens 7 ... Total reflection mirror 8 ... Relay lens 9 ... Pupil split LCD 10 ... Image sensor

Claims (3)

[Claims] A photographing optical system; a half mirror for dividing a light beam from the photographing optical system into a light beam to a film surface and a light beam to an image sensor; And an insertion / removal mechanism. 2. An imaging optical system for forming an image of a subject on a film surface, an imaging device for acquiring image data corresponding to the image of the subject, and a light beam from the imaging optical system to the film surface. A camera comprising: a spectroscopic unit that divides a light beam into a light beam and a light beam to the image pickup device; and an insertion / removal mechanism that inserts / removes the spectroscopic unit into / from a light beam from the imaging optical system. 3. A selecting means for selecting a first mode in which imaging by an image sensor and shooting on film are performed simultaneously, and a second mode in which only image shooting on film without imaging by the image sensor is performed. 3. The camera according to claim 2, wherein the insertion / removal mechanism controls the insertion / removal operation of the spectral unit based on an output of the selection unit.