JP2000010158A - Flashing control system and housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain appropriate exposure even in the case of photographing in a state where a flash is separated from a camera by executing preliminary light emission by a 1st flash light emitting device installed in such that a distance from a light emitting surface to an object is the same substantially as a distance to film arranged in the camera. SOLUTION: The preliminary light emission is performed by using the flash 301 incorporated in the housing 300 whose position may be nearly fixed with respect to the camera 100. Thus, the flash for the preliminary light emission is arranged at a distance where the distance from the flash to the object is regarded as equal to the distance from the object to the film surface, which is the requisite condition of a control program for TTL light control incorporated in a camera for on-load photography. Even in the case of photographing with the housing, the program (algorithm) for the TTL light control is utilized, so that control for TTL light control is executing in underwater photography equally to the on-load photography.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash control system for a camera and a camera housing, and more particularly to a flash control system and a flash control system suitable for performing TTL dimming with pre-flash in water. The present invention relates to a housing suitable for use in a housing.

[0002]

2. Description of the Related Art As a conventional TTL light control method, a so-called TTL light control method is known as a control method for performing automatic light control using a single-lens reflex camera and a flash light emitter (hereinafter referred to as a flash). ing. In this method, a light beam emitted from a flash and reflected from a subject is measured in real time through a photographing lens, and the flash emission is stopped when the amount of light emission reaches an appropriate amount. Since this method measures the light flux passing through the taking lens, it is particularly excellent in that there is no shift (parallax) between the area to be photographed and the area to be measured and that the photographer can freely set the aperture value. ing.

However, this method has a disadvantage in that a measurement error occurs due to the distribution and reflectivity of the object, and this causes an exposure error in photographing because the flash light reflected from the object is measured and controlled.

Accordingly, Japanese Patent Application Laid-Open No. 4-371 by the present applicant has been proposed.
In Japanese Patent No. 933, the light control element is divided into multiple parts, preliminary light emission is performed prior to the main exposure for photographing, the distribution state and the reflectance of the subject are obtained from the amount of received light, and the result of A technique has been disclosed in which a proper exposure is obtained by adjusting a light control area and a flash light emission level regardless of the distribution state and reflectance of a subject (hereinafter, this is referred to as a TTL multi-light control method).

Further, Japanese Patent Application Laid-Open No.
No. 6922 discloses that in a TTL multi-dimming system,
As shown in FIG. 9, there is disclosed a technique in which preliminary light emission is performed by a flash 32 built in a camera 31 and main light emission is performed by a flash 33 externally connected.

[0006] On the other hand, for the dimming method using the underwater camera, see Nikonos R manufactured by our company.
A TTL dimming method using S is known. This enables the TTL dimming method described above to be performed. However, in a case where a plurality of flashes are used in underwater photography with an underwater camera, accessories that flexibly fix the position of the flash with respect to the camera are used in order to enable illumination at various angles depending on the shooting location. Was.

[0007]

In the TTL multi-dimming system, the distribution and reflectance of the object are mainly determined from the relationship between the amount of light emitted during the preliminary light emission, the amount of light reflected from the object at the time of the preliminary light emission, and the object distance. Is calculated. Therefore, there is a condition that the distance between the flash that performs preliminary light emission and the subject must be substantially the same as the distance between the camera that captures the image and the subject. That is, the flash and camera must be in almost the same place. If the flash that performs preliminary light emission is located far away from the camera, an error occurs in the amount of reflected light from the subject received by the camera, and the distribution and reflectance of the subject cannot be calculated correctly. It is.

[0008] However, in some cases, there is a case where the flash is taken away from the camera. For example, in the case of underwater photographing or the like, a flash is arranged at the tip of an arm connected to the camera, and the photographer can freely set the light distribution by the flash light. In such a case, the difference in distance between the camera and the flash causes an error in the calculation as described above, and thus there has been a problem that it is difficult to obtain an appropriate exposure with the conventional TTL light control method.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flash control system and a housing capable of obtaining a proper exposure without causing an exposure error even in the above case.

[0010]

In order to achieve the above object, a flash control system according to the present invention comprises: a connection portion to which a plurality of flash light emitters can be connected; a first flash light emitter connected to a camera body; 2 flash light emitters, wherein the first flash light emitter is installed so that the distance from the light emitting surface to the subject is substantially the same as the distance from the film disposed in the camera. Preliminary light emission that emits light in advance,
The second flash light-emitting device performs main light emission at the time of photographing exposure.

The flash control system according to the present invention is arranged at a position where a distance from the light emitting surface to the subject is substantially equal to a distance between the film surface in the camera and the subject,
A first flash unit connected to the housing or the camera body, a second flash unit used for connection to the housing or the camera body, and a flash connection unit connectable to the plurality of flash units; The first flash unit may be made to perform preliminary light emission for emitting light prior to photographing, and the second flash unit may be made to perform only main light emission at the time of photographing exposure.

The first flash emitter of the flash control system of the present invention may be built in the housing, may be housed in the housing connected to the camera body, or may be outside the housing. May be fixed.

In order to achieve the above object, a housing according to the present invention comprises a first housing fixed at a position where a distance from a light emitting surface to an object is substantially equal to a distance between a film surface in the camera and the object. It comprises a flash light emitter and a connection part for connecting to the camera body.

It is preferable that the housing has a connecting portion for connecting to the second flash unit. Further, it is preferable that the first flash unit includes a terminal to which power is supplied from the camera. It is preferable that the camera restrict the power supply current value until the camera confirms the mounting of the flash emitter.

(Function) According to the present invention, in the case of underwater photographing, the first flash light emitting device that performs the preliminary light emission satisfying the predetermined condition is provided, so that the second flash light emitting device is installed away from the camera. Also enables accurate dimming control,
Thus, TTL multi-dimming can be performed even in underwater photography.

At this time, TTL multi-dimming can be performed by using a camera having no built-in flash by providing the first flash unit for performing preliminary light emission in the housing.

[0017]

1 to 8 show a first embodiment of the present invention, which will be described below with reference to these drawings. FIG. 1 shows an appearance of the camera system of the first embodiment. FIG. 2 is a diagram schematically showing a main part of the camera. FIG. 3 is a block diagram showing a schematic configuration of the flash control system of the camera.

The camera according to the first embodiment includes a camera 100,
It is composed of an underwater housing 300 that houses the taking lens 200 and the camera 100, and an underwater flash 400 that is detachably attached to the housing 300. The camera 100 is a camera to which a photographic lens 200 is connected and land photography can be performed without the housing 300. Such a camera 100 and a lens 200
It is stored in the housing 300. When the camera 100 is housed in the housing 300, the hot shoe 100 a provided on the camera 100 is connected to the connection terminal 300 c from the housing 300, so that the camera 100
0 and the housing 300 are electrically connected.

FIGS. 6A and 6B show the shape of the flash contact portion between the camera 100 and the housing 300. FIG.
As shown in FIG. 6A, a flash contact portion 300c having the same shape as a normal external flash is provided in the housing 300, and a camera 100 as shown in FIG.
Is set in the housing 300 (shown by a dotted line in FIG. 6A), and is connected to the hot shoe 100a for the flash contact of the camera 100. Thus, the camera 100 and the first flash 301 are electrically connected without cable connection. Although the connection line between the external flash connection terminal 300b and the first flash 301 is omitted in FIG. 6A, the connection line is housed inside the thick portion in the main body of the housing 300. They are connected by wiring. The electric circuit of the first flash 301 is also built in the thick part of the housing 300.

As described above, the contacts of the camera 100 and the housing 300 are connected, and the camera 100 is connected to the housing 3.
When the housing 300 is housed inside and the back cover 300d is closed, the housing 300 has a waterproof structure. Also, the housing 30
0 denotes a built-in first flash 301 and an external underwater flash (hereinafter referred to as a second flash) 400
Are provided with a connection terminal 300b and a support arm 300a. Although not described in detail, the support arm 300a has a positioning mechanism, and supports the second flash 400 so that the position of the second flash 400 can be freely changed to some extent with respect to the camera 100.

FIG. 2 shows the camera 100 in the housing 300.
FIG. 2 schematically shows the main components of the first embodiment, particularly the optical system, in a state in which is stored. FIG.
Fig. 2 functionally shows main components of the first embodiment.

As shown in FIG. 2, the housing 300
The camera 100 on which the taking lens 200 is mounted is housed.
The taking lens 200 includes a taking optical system 201, an aperture 210,
A lens CPU 226 (disclosed in FIG. 3)
Has a mechanism that opens and closes in response to a signal from the camera body. As shown in FIG. 3, the CPU 226 is connected to the MPU 25 of the camera 100, and outputs lens information stored in a memory in response to a request from the camera. The camera 100 includes a quick return mirror 102, a finder optical system, a photometric unit 101, a light control unit 115, a shutter 111, and an electric circuit (not shown in FIG. 2) including the MPU 25 shown in FIG. Form an optical system.
The film surface 112 of the film mounted on the camera 100 is disposed on the right side of the shutter 111 on the paper surface. The finder optical system includes a diffusion clean 103 that diffuses the light reflected by the quick return mirror 102, a condenser lens 104 that forms an image of the light from the diffusion screen 103, and a pentaprism that secures an optical path length and guides the light to the eyepiece 106. 105 and an eyepiece 106. The photometric unit 101 includes a photometric prism 107, a photometric lens 108, and a photometric element 109, and uses a part of the light guided to the finder optical system to measure the luminance of the subject when not illuminated by the flash. Photometric element 10
9 is divided into a plurality of areas B1 to B5 as shown in FIG. Further, the camera 100 has a hot shoe unit 100a having a connection terminal for connecting a flash above the finder unit. MPU25
Will be described later.

The photographing lens 200 has an optical system 201. In the state shown in FIG. 2, the light beam that has passed through the optical system 201 is bent by the quick return mirror 102 of the camera 100 and forms an image on the diffusion screen 103 once. After that, the light reaches the photographer's eyes through the condenser lens 104, the pentaprism 105, and the eyepiece 106. On the other hand, a part of the light beam diffused by the diffusion screen 103 is condensed by the condenser lens 104, the pentaprism 105, the photometry prism 107, and the photometry lens 1.
08, the image is re-imaged on the photometric element 109 for stationary light. At the time of photographing, the aperture 210 of the photographing lens 200 is stopped down to a predetermined value, and at the same time, the quick return mirror 102 of the camera 100 is flipped up. First, at the time of preliminary light emission, the first flash 301 emits flash light, and a photographing light flux including light reflected by the subject is formed on the shutter 111. The imaged light is reflected by the shutter curtain surface 111, and the reflected light is re-imaged on the light control element 114 through the light control lens 113, and the light is measured. Then, during the main light emission that operates following the preliminary appearance, the shutter 111 is opened, the second flash 400 emits flash light, and a photographing light beam including light reflected by the subject out of the flash light enters the film surface 112, and the exposure is performed. I do. Further film surface 11
The light reflected by 2 is re-imaged on the light control element 114 through the light control lens 113 and measured. Note that the photographing optical system 201 is shown by one lens for convenience of description, but usually, an optical system composed of a plurality of groups using a plurality of lenses is used. It also has a lens that can move in the optical axis direction for alignment. Such a photographic lens 200 includes a mechanism that moves and focuses in response to a request from a camera or an operation of an operator. In addition, depending on the type of photographing lens, there is a photographing lens provided with a zoom mechanism that can change the photographing magnification and a shake correction mechanism that reduces camera shake, and the present invention can be applied to any of these photographing lenses.

FIG. 7 shows the camera 100 and the first flash 3.
FIG. 11 is a diagram showing an electrical connection state between the first flash device and a second flash. Hot shoe 100a of camera 100
Are provided with a contact for communication between the camera and the flash and a contact for power supply to the flash, in addition to the GND and X contacts. Although a large current is supplied from the power supply contact for flash emission, there is a danger of short-circuiting to GND when the flash is not connected because the hot shoe is exposed. Therefore, the camera 100 first checks the attachment of the second flash 400 until the connection terminal 330 b
A current limit is provided at the power supply contact to the camera so that only a current sufficient for communication between the camera and the first and second flashes is supplied to the flash side. After the attachment of the second flash is confirmed, the current limit is released, the electric power required for light emission is supplied to the housing 300, and the energy required for causing the first flash to emit light is charged. If the second flash 400 is not connected and a cap is connected for waterproofing, the external flash terminal 30
Power supply to 0b is prohibited. Contact point 100a of camera 100
The contact 300c of the first flash 301 is connected without a cable as shown in FIG. By this connection, power supply from the camera 100 side, communication between the camera and the first and second flashes, flash light emission control of the first and second flashes, and the like are performed. G is connected from the first flash 301 to the second flash 400 by the contact cable 300b.
The ND, the X contact, and the STOP contact for instructing stop of flash emission are connected, and flash emission control of the second flash is performed.

Although the system of the first embodiment is configured to perform preliminary light emission by the first flash and main light emission by the second flash, both the first and second flashes are made to emit light during the main light emission. You may do it. When the second flash is not attached, the first flash may emit light in both preliminary light emission and main light emission.

A conventional external flash usually has its own power supply, and the system of the first embodiment supplies power only to the first flash 301 in the housing 300. As shown by a dotted line, power may be supplied to the second flash via the first flash.

As shown in FIG. 3, the camera 100 includes a microprocessor (MICRO PROSESSING).
UNIT (hereinafter referred to as MPU) 25. All operations including flash control in the camera 100 are controlled by a program of the MPU 25 provided in the camera. FIG. 3 shows each block of the program of the MPU 25 which is functionally expressed mainly with respect to a portion related to the present invention, a mechanism other than the program, and a connection state with the outside of the camera 100.

In the camera 100, when a power switch (not shown) is turned on and the release switch 23 is half-pressed, the program of the MPU 25 is started. The first flash 301 is an MP in the camera 100.
It is connected to U25 and performs preliminary light emission in response to a signal from the light emission control unit 17 in the MPU 25. Further, the second flash 400 performs main light emission according to a signal transmitted from the light emission control unit in the MPU 25 via the first flash 301.

The photometric unit 101 includes a prism 1 shown in FIG.
As shown in FIG. 4, the photometric element 9 can divide almost the entire surface of the object into five parts to perform photometry and output photometric values B1 to B5. ing. As shown in FIG.
Is connected to the MPU 25, and calculates the photometric value of each area measured by the photometric unit 101 for the light intensity calculation unit 20 in the MPU 25.
And an exposure calculation unit. The exposure calculation unit 21 in the MPU 25 calculates a steady light exposure value using the photometric value from the photometric unit 101. The method of calculating the constant light exposure value is well known in many documents and is not directly related to the present invention, so that the description is omitted. The exposure controller 22 controls the exposure value calculated by the exposure calculator 21 and the film sensitivity setting unit 2
A combination of a controllable aperture value and a shutter value is calculated from the film sensitivity value set in step 4, and in response to the full depression of the release switch 23, the aperture 210 and the shutter 111 are controlled by the respective values and the film 112 is controlled. Exposure to The film sensitivity setting unit reads a mark provided on the film container and automatically sets the sensitivity. Although not shown, the film sensitivity setting unit is provided in the camera 100. Details are also omitted here.

The light control section 115 includes a light control lens 113 and a light control element 114 disposed below the camera 100 as shown in FIG. 2, and reflects reflected light of a photographing light beam incident on the film surface 112. Then, an image is formed on the light control element 114 via the light control lens 113. Details of the light control lens 113 and the light control element 114 are shown in FIG. FIG. 5 is a diagram illustrating a divided state of the light control unit 114 in comparison with an object scene.

The light control lens 113 includes three light control lenses 13a to 13c and a slit plate 15 disposed on the front surface thereof.
And each slit S1 of the slit plate 15
ＳS5 pass through the corresponding dimming lenses 13a〜1
An image is formed via 3c and projected on the dimming element 114.
As shown in FIG. 4, the dimming element 114 has five S1 to S5.
It is divided into regions, and the amplification gain of the photocurrent can be set for each region, and the amount of light received during flash emission can be output independently. The control of the light emission amount is performed by outputting a stop signal and stopping the flash light when the sum of the photocurrents amplified by the amplification gains set for the respective regions reaches a predetermined value.
Note that the divided shapes of S1 to S5 are substantially the same as the divided shapes of B1 to B5 of the photometric unit 9 shown in FIG. Although there are a plurality of types of cameras having different division shapes and the number of divisions, the present invention can be implemented with any of these cameras.

The operation of the photometric unit 101 and the light adjusting unit 115 will be described. At the time of preliminary light emission, after the gain setting unit 26 in the MPU 25 sets the same gain in each of the five regions based on the aperture value information from the exposure control unit 22, the aperture 210 is stopped down and the shutter 111 is still When in the closed state, the first flash 301 emits light until the amount of reflected light received from the shutter 111 reaches a predetermined value. When the light emission amount reaches a predetermined value, a stop signal is output to the light emission control unit 17 to stop the light emission. Then, the light reception amount calculation unit 18 reads the light reception amount of each region during the preliminary light emission from the light control unit 115 and the light emission amount in the preliminary light emission from the light emission control unit, and outputs the information to the region selection unit 19. . The area selection unit 19 reads out focus distance information of the photographing lens 200 from an in-lens MPU (microprocessor unit) 226 mounted in the photographing lens 200, performs an arithmetic operation based on the information, and performs processing in S1 to S5. To select an area to be used at the time of main light emission. The light intensity calculation section 20 calculates a light adjustment correction amount at the time of main light emission based on the area selection information of the area selection section 19 and the luminance information from the photometry section 9, and outputs the information to the gain setting section 26. At the time of the main light emission, after the gain setting unit 26 sets the gain of the light control unit 115 again for each area, the second flash is fired in synchronization with the full opening of the shutter 111, and the stop from the light control unit 115 is stopped. Light emission is performed until a signal is output.

Next, the operation of the system according to the first embodiment will be described. FIG. 8 is a flowchart showing a program of the microprocessor 25. When the release switch 23 of the camera is half-pressed, the power of the camera 100 is turned on, and this program is executed. First, in step S101, communication is performed with the in-lens MPU 226 provided in the photographing lens, and information such as the focus distance, the open F value, the focal length, and the exit pupil position of the photographing lens 200 is read. Next, in step S102, the flash 30
1 and 400 to read information such as whether or not a flash is mounted and whether or not the flash is capable of preliminary light emission. In step S103, the film sensitivity set manually or automatically is read from the film sensitivity setting unit 24. In step S104, the photometry unit 109 performs the steady-state photometry, and performs correction based on the lens information read in step S101 to obtain luminance information B1 to B5. In step S105, a steady light exposure calculation is performed, and an appropriate exposure value BVan is calculated.
Then, the aperture value and the shutter value at the time of shooting are calculated from BVans and the film sensitivity value. In step S106, it is determined whether or not the release switch 23 has been fully pressed.
07, otherwise jumping to step S114. In step S107, the quick return mirror 102 is flipped up, and the aperture 210 is moved to step S105.
The aperture value is narrowed down to the aperture value obtained in. Step S1
08, preliminary light emission is performed by the method described above, and S1 to S
5 is calculated. In step S109, a dimming area to be used at the time of main light emission is selected based on the obtained light receiving value information, aperture value, focus distance, and the like. In step S110, a dimming correction amount is calculated based on the steady light luminance values B1 to B5.
The method of selecting the dimming area and calculating the dimming correction amount is described in detail in Japanese Patent Application Laid-Open No. Hei 4-371933 by the present applicant, and the description thereof is omitted here.
Next, in step S111, the shutter 111 is fully opened, and in step S112, main light emission control is performed based on the light control area and the light control correction amount obtained above. In step S113, the shutter 111, the aperture 210, and the quick return mirror 102 are returned to the positions before photographing. Step S114
Then, it is determined whether or not a predetermined time has elapsed after the half-press timer is activated, and if within the predetermined time, the process returns to step S101 to repeat the same processing, and if the timer has expired, the processing ends.

As described above, the camera of the first embodiment is built in the housing 300 so that its position can be
, A flash 301 is provided at a substantially constant position, and preliminary light emission is performed using the flash 301. As a result, the TT built as a land-based camera
The pre-flash can be placed at a distance that allows the distance from the flash to the subject, which is the condition of the L dimming control program, to be equal to the distance from the subject to the film surface. A light program (algorithm) can be used. Therefore, even in underwater photography, TTL dimming control equivalent to that on land can be performed.

The housing 300 is provided with the land camera 1.
Built-in flash 301 when using 00 for underwater photography
Since no power supply is provided, the size of the housing can be reduced. In addition, since only one power supply is required by supplying power from the camera 100 to the first flash, if the power supply is provided on the housing side, the power supply capacity of both the camera and the housing must be taken into consideration. In the case of the example, only the camera battery needs to be considered. However, since a power supply terminal and power supply control are required to supply power from the camera, it may be provided on the housing side. Also, if a power supply is provided in the housing, it is possible to supply only a camera with sufficient power for photographing with more camera-side power than in the case of power supply from the camera.

A system according to the second embodiment will be described with reference to FIG. The camera according to the second embodiment is a camera in which a photographic lens 200 is attached to a camera body 100 and a commercially available land-based flash 302 is attached to a housing 310, and a second flash and two flashes are provided. Are connected. The second flashes 400 and 401 each include a contact cable 300
b, and the respective support arms 300a can independently change the positional relationship with the camera 100, thereby making it possible to devise how the shadow of the subject is projected by the flash. First flash 302, second
Each of the flashes 400 and 401 has a power supply, and only the signal line is connected.

The operation of the second embodiment is almost the same as that of the first embodiment except that the second flash has two lamps and that the first flash is not built in the housing. According to the second embodiment, since the land flash can be used as the first flash, TTL dimming control can be performed using the housing under exactly the same conditions as those for land shooting using the land camera.

In the second embodiment, the external flash 302 is used as the first flash. However, the same applies to a small flash incorporated in a land camera.
Note that, in the above two embodiments, the description has been given of a case where the underwater photographing housing is attached to the ordinary land-based camera, but the present invention is also applicable to an underwater camera having the same function. Can be.

In this case, the camera body 100 and the housing 300 are integrated, and the first flash 301 may be externally or internally provided. Of course, in the case of external attachment, the hot shoe portion needs to be waterproofed. The second flash 400 is supported by the underwater camera main body or an arm detachably attached to the underwater camera main body, and the electric connection may be made to the camera main body via a contact as in the present embodiment.

The present invention can be applied not only to the case of using an underwater housing but also to the case of using another housing such as a case where a heat insulating housing is used in a cold region.

[0041]

As described above in detail, according to the flash control system and the housing of the present invention, the flash for performing the preliminary light emission is fixed at a position having a predetermined relationship with the camera, and is provided separately from the flash for performing the main light emission. Even when the main light emission flash is away from the camera, accurate light control can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a system according to a first embodiment.

FIG. 2 is a schematic diagram illustrating an optical system of the system according to the first embodiment.

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

FIG. 4 is a diagram illustrating a divided shape of a photometric unit of the camera according to the first embodiment.

FIG. 5 is a diagram illustrating a divided shape of a light control unit of the camera according to the first embodiment.

FIG. 6 is a diagram illustrating a shape of a flash contact portion of the housing according to the first embodiment.

FIG. 7 is a diagram showing a connection state of a flash contact of the system of the first embodiment.

FIG. 8 is a flowchart illustrating an algorithm according to the first embodiment.

FIG. 9 is a schematic diagram illustrating a configuration of a system according to a second embodiment.

[Explanation of symbols]

 300 Underwater housing 301 First flash (first flash unit) 400 Second flash (second flash unit) 100 Camera 100a Hot shoe 101 Photometer 107 Photometric prism 108 Photometric lens 109 Photometric element 112 Film surface 113 Dimming Lens for light control 114 Light control element 115 Light control unit 25 Microprocessor 17 Light emission control unit 18 Light reception amount calculation unit 19 Area selection unit 20 Light control amount calculation unit 21 Exposure calculation unit 22 Exposure control unit 23 Release switch 24 Film sensitivity setting unit 26 Gain Setting unit 29 Connection cable 200 Photo lens 201 Optical system 210 Aperture 226 In-lens MPU

Claims (6)

[Claims] 1. A connecting portion connectable to a plurality of flash light emitters,
A first flash emitter connected to the camera body; and a second flash emitter, wherein the first flash emitter has a distance from a light emitting surface to a subject to a film disposed in the camera. And a second flash unit that performs main emission at the time of photographing exposure. The flash control of the underwater camera is performed. system. 2. A flash control system for performing underwater photography using a camera body, a housing for accommodating the camera body, and a plurality of flash light emitters, wherein a distance from a light emitting surface to a subject is a film in the camera. A first flash unit disposed at a position substantially equal to the distance between the surface and the subject and connected to the housing or the camera body, and a second flash unit used by connecting to the housing or the camera body; A flash connection unit to which the plurality of flash light emitters can be connected; the first flash light emitter performs preliminary light emission to emit light prior to photographing;
A flash control system for a camera, characterized in that the flash unit emits only main light at the time of exposure. 3. A camera housing for housing a camera body, wherein a first flash is fixed at a position of the housing where a distance from a light emitting surface to an object is substantially equal to a distance between a film surface in the camera and the object. A camera housing comprising a light emitter and a connection part for connecting to the camera body. 4. The camera housing according to claim 1, wherein said housing has a connection portion for connecting to a second flash unit. 5. The housing according to claim 3, wherein said first flash unit has a terminal to which power is supplied from a camera. 6. The flash control system according to claim 1, wherein the camera sets a limit on the power supply current value until the camera confirms the mounting of the flash light emitter.