JP2014095876A - Camera system and light-emitting device, and control method of camera system and light-emitting device - Google Patents

Abstract

Even when a light-emitting device that issues a light emission start instruction to another light-emitting device performs pre-light emission by flash light emission, each light-emitting device can correctly perform photometry at the time of pre-light emission.
A first light emitting device built in or removable from an imaging device controls a light emitting unit according to a pre-light emission instruction from the imaging device and starts pre-light emission to the second light emitting device. A flash is emitted to make it happen. Then, the first light emitting device controls the light emitting unit so as to perform flash light emission for the side groove by the imaging device after a lapse of a predetermined time from the flash light emission. The second light emitting device performs flat light emission for photometry by the imaging device in response to the flash light emission for starting the pre-light emission.
[Selection] Figure 5

Description

  The present invention relates to a camera system having an imaging device and a plurality of light emitting devices, a light emitting device, and a control method thereof.

  Conventionally, as a strobe device that performs pre-flash, the pre-flash is used to measure subject reflected light, the main flash is calculated based on the photometric value, the main flash is calculated using the calculated flash, and the appropriate exposure amount There is known a strobe system that obtains (Patent Document 1).

  There is also a strobe system that performs photometry of subject reflected light by pre-emission using a master strobe device mounted on a camera body and a slave strobe device disposed at a position away from the camera. In the strobe system disclosed in Patent Document 2, a master strobe transmits a light emission start signal based on a plurality of light pulse signals to a slave strobe. Thereafter, when the master strobe starts pre-emission by flat emission, the slave strobe detects it and performs pre-emission by flat emission. By interlocking the master strobe and slave strobe, the subject reflected light can be measured under the pre-flash of both the master strobe and slave strobe.

Japanese Patent Laid-Open No. 10-48713 Japanese Patent No. 3962489

  However, in the configuration of Patent Document 2, it is required that flat light emission is possible in both the master strobe and the slave strobe. That is, in Patent Document 2, when the master strobe does not have a flat light emission function and can only perform flash light emission, the subject reflected light is accurately measured by pre-flashing the master strobe and slave strobe at the same time. It is not possible. This point will be described below.

  The slave strobe light is triggered by the master strobe light. When the master strobe and slave strobe perform pre-flash using flat light emission, it is possible to cause the master strobe and slave strobe to emit light simultaneously for a long time. Therefore, it is possible to perform photometry by starting light emission before the start of photometry by the camera and ending light emission after the end of photometry by the camera. On the other hand, if the master strobe can only perform pre-flash by flash emission, if pre-flash is performed before the start of metering by the camera, the master flash will flash before the start of metering, and all of the intended light intensity will be measured. I can't let you. In addition, even if the master strobe is flashed at the timing of the start of metering, the slave strobe starts to emit flat light during the flash emission by the master strobe. The amount of light cannot be measured. Therefore, when the master strobe can only emit flash light, only one of the master strobe and slave strobe pre-lit subject reflected light can be measured correctly.

  The present invention has been made in view of the above-described problems. Even when a light emitting device that issues a light emission start instruction to another light emitting device performs pre-light emission by flash light emission, each light emitting device can perform a pre-light emission. The purpose is to enable correct photometry.

In order to achieve the above object, a camera system according to an aspect of the present invention has the following arrangement. That is,
A camera system comprising: an imaging device; a first light-emitting device that is built in or removable from the imaging device; and a second light-emitting device that is separate from the imaging device and the first light-emitting device,
The first light emitting device includes:
A first control for controlling the light emitting means to perform flash light emission for starting the pre-light emission in the second light-emitting device in response to a pre-light emission instruction from the imaging device;
A light emission control means for performing a second control for controlling the light emission means so as to perform a flash light emission for photometry by the imaging device after a lapse of a predetermined time from the flash light emission by the first control,
The second light emitting device includes:
In response to the flash emission by the first control, the imaging device performs flat light emission for the photometry.

  According to the present invention, even when a light-emitting device that issues a light emission start instruction to another light-emitting device performs pre-light emission by flash light emission, photometry at the time of pre-light emission of each light-emitting device can be performed correctly.

FIG. 3 is a diagram illustrating a configuration of a master strobe device and a slave strobe device according to the embodiment. The block diagram which shows the electric circuit structure of the strobe device which concerns on embodiment. 1 is a block diagram showing an electric circuit configuration of an imaging apparatus according to an embodiment. The timing chart explaining the wireless communication and light emission which concern on embodiment. The timing chart explaining the wireless pre light emission which concerns on embodiment. The figure which shows the outline | summary of the strobe system by embodiment. 6 is a flowchart for explaining operations of a master strobe device and a slave strobe device according to the embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1. Configuration of Camera System and Light Emitting Device FIG. 6 is a diagram illustrating a camera system according to the embodiment. A master strobe device 101 that is a first light emitting device is attached to a camera 100 as an imaging device. The master strobe device 101 may be built in the camera 100 or configured to be removable. The camera system includes a slave strobe device 151 that is a second light emitting device separate from the camera 100 and the master strobe device 101, and constitutes a multi-flash strobe camera system. Communication between the camera 100 and the master strobe device 101 is performed via an accessory shoe, for example. In addition, wireless communication by light is possible between the master strobe device 101 and the slave strobe device 151, and communication is performed when the slave strobe device 151 receives light emitted from the master strobe device 101. With reference to FIG. 1, a configuration of a strobe device as a light emitting device that can be connected to the imaging device according to the embodiment will be described.

[Master strobe device 101]
A master strobe device 101 in FIG. 1A is a strobe capable of wireless transmission using light. The master strobe device 101 performs light emission control according to data from the camera 100.

  A xenon tube (discharge tube) 102 serving as a light emitting means converts electric energy into light emission energy. The Fresnel lens 103 and the reflecting plate 104 each condense light emission energy toward the subject efficiently. The clip-on connector 105 is used to mechanically fix the master strobe device 101 to the camera 100, a tripod or the like. The accessory shoe joint pin 106 is electrically connected to the camera 100 or the like, and is used to transmit a light emission instruction and control information between the master strobe device 101 and the camera 100. The glass fiber 107 guides light emitted from the xenon tube 102 to a light receiving element 108 such as a photodiode. The light receiving element 108 directly measures the light amount of the pre-flash and the main flash of the master strobe device 101. The light guide 110 integrated with the reflector 104 reflects the light from the xenon tube 102 and guides it to the glass fiber 107.

[Slave strobe device 151]
The slave strobe device 151 in FIG. 1B is a strobe in which a configuration capable of wireless reception by light and flat light emission by intermittent light emission operation is added to the configuration of the master strobe device 101 in FIG. The slave strobe device 151 can operate both as a master strobe and as a slave strobe. The same reference numerals as those in FIG. 1A are attached to the same configurations as those of the master flash device 101.

  The light receiving element 109 configured by a photodiode or the like monitors the light emitted from the xenon tube 102 in the same manner as the light receiving element 108. By controlling the light emission current of the xenon tube 102 based on the output of the light receiving element 109, the flat light emission control by the intermittent light emission operation is performed. The light guide 111 integrated with the reflector 104 reflects the light from the xenon tube 102 and guides it to the light receiving element 109. The light receiving element 112 receives control information based on an optical signal from the master strobe device 101, and thereby controls pre-light emission and main light emission.

  In the present embodiment, the case where the master flash device 101 has a simple configuration that cannot perform flat light emission and slave operation will be described. However, the present invention is not limited to this. For example, a strobe device capable of flash light emission and flat light emission and capable of operating both a master strobe and a slave strobe operates as the master strobe device 101, and the pre-light emission uses flash light emission without using flat light emission. It also applies when operating.

2. Strobe electrical circuit configuration [Master strobe device]
FIG. 2A is an electric circuit block diagram of the master strobe device 101 of FIG. The booster circuit 202 boosts the voltage of the battery 201 as a power source to several hundred volts. The main capacitor 203 stores electrical energy that is the output of the booster circuit 202. The voltage dividing resistors 204 and 205 divide the voltage of the main capacitor 203 to a predetermined ratio, and are connected to the AD input terminal of the strobe microcomputer 220. The trigger circuit 206 excites the xenon tube 102.

  The light receiving element 108 is a photodiode that is a light receiving sensor for controlling flash emission, and monitors the light output of the xenon tube 102. The photometric integration circuit 208 logarithmically compresses the photocurrent flowing through the light receiving element 108, compresses and integrates the light emission amount of the xenon tube 102, and inputs it to the comparator 212 for controlling the light emission amount during flash emission. The light emission control circuit 207 performs light emission control such as the light emission amount of the xenon tube 102 based on the output of the comparator 212. The stroboscopic microcomputer 220 is a microcomputer that controls the operation of the stroboscope, and incorporates a program for performing light emission processing, adjustment values for performing various controls, an AD converter, and the like. Further, the flash microcomputer 220 performs light emission control processing such as first control processing and second control processing described later.

[Slave flash unit]
FIG. 2B is an electric circuit block diagram of the slave strobe device 151 of FIG. The same components as those in FIG. 2A are denoted by the same reference numerals. The data selector 221 selects D0, D1, and D2 according to a combination of two inputs Y0 and Y1, and outputs it to Y. The light emission control circuit 207 inputs the output (Y) of the data selector 221 and performs light emission control of the xenon tube 102. Note that Y0 and Y1 of the data selector 221 are connected to the flash microcomputer 220, and the output of the data selector 221 can be switched. That is, the stroboscopic microcomputer 220 can select the output of the above-described comparator 212 during flash emission and the output of the comparator 213 described later during flat emission as the output Y of the data selector 221.

  The light receiving element 109 is a photodiode which is a light receiving sensor for flat light emission control, and monitors the light output of the xenon tube 102. The photometry circuit 209 amplifies a minute current flowing through the light receiving element 109, converts the photocurrent into a voltage, and inputs the voltage to a comparator 213 for controlling emission light intensity of flat light emission. The light receiving element 112 is a photodiode that is a means for receiving an optical signal, receives the optical signal of the master strobe, amplifies the photocurrent flowing through the light receiving element 112, and inputs it to the light receiving circuit 214 that converts it into a voltage. Take control.

3. Electrical Circuit Configuration of Camera 100 FIG. 3 is an electrical circuit block diagram of the camera 100 to which the strobe device can be attached. The camera microcomputer 301 is a main microcomputer that controls the camera 100, and performs power supply control, switch control, lens control, photometry, distance measurement control, shutter control, and the like. The camera microcomputer 301 includes a power supply circuit 302, a switch array 304 including two switches (referred to as SW1 and SW2) of a release button, a strobe connection shoe switch, an oscillation circuit 305, a focus detection circuit 310, a photometry circuit 311, An LCD drive circuit 312 and the like are connected. The camera microcomputer 301 is connected to a shutter control circuit 320, a motor control circuit 321, an image processing engine 330, and the like.

  The camera microcomputer 301 is driven by the clock generated by the oscillation circuit 305 and performs accurate time management by counting this clock. The camera microcomputer 301 controls the timing in the operation sequence of the entire camera and the timing in the communication sequence with an external strobe or remote controller.

  The focus detection circuit 310 performs accumulation control and readout control of the distance measuring sensor according to the signal of the camera microcomputer 301 and outputs each pixel information to the camera microcomputer 301. The camera microcomputer 301 performs AD conversion on this information and performs focus detection by a known phase difference detection method. The camera microcomputer 301 performs focus adjustment of the photographing lens by exchanging signals with the microcomputer in the lens body 350 based on the focus detection information.

  The photometry circuit 311 outputs an output from the photometry sensor 315 to the camera microcomputer 301 as a luminance signal of the subject. The photometry circuit 311 outputs a luminance signal in both a steady state in which strobe light is not pre-flashed toward the subject and a pre-flash state in which pre-flash is emitted. The camera microcomputer 301 converts the luminance signal from analog to digital, calculates the aperture value for adjusting the exposure of the image, calculates the shutter speed, and calculates the main flash emission amount during exposure. The shutter control circuit 320 controls the two shutter drive magnets constituting the focal plane shutter according to the signal from the camera microcomputer 301, travels the shutter curtain, and performs the exposure operation.

  The motor control circuit 321 controls the motor 322 in accordance with a signal from the camera microcomputer 301 to perform up / down of the main mirror and charge of the shutter. The switch SW1 included in the release button is turned on by the first stroke of the release button, and serves as a switch for starting photometry and AF. The switch SW2 is turned on by the second stroke of the release button, and becomes a switch for starting an exposure operation. The camera microcomputer 301 detects signals from SW1, SW2 and other camera operation members (not shown).

  The LCD drive circuit 312 controls the display on the monitor LCD 317 together with the display on the LCD 316 in the viewfinder in accordance with a signal from the camera microcomputer 301. The image processing engine 330 is a processor that mainly performs digital image processing, and controls the imaging sensor 340 and controls image processing, image display, image recording, and the like by a program stored in the FROM 331.

  When there is an imaging control request from the camera microcomputer 301, the image processing engine 330 performs accumulation control and readout control of the imaging sensor 340 via the timing generator (TG) 341. The image signal read from the image sensor 340 is converted from analog to digital by the AD converter 342, input to the image processing engine 330, and temporarily stored in the DRAM 332.

  The image signal temporarily stored in the DRAM 332 is read again by the image processing engine 330, and image processing such as known color interpolation processing, white balance processing, and gamma processing is performed, and finally converted into digital image data such as JPEG. Is done. When the digital image data is generated, it is temporarily stored again in the DRAM 332, displayed on the TFT display device 334 as a quick review, and further recorded on the recording medium 333.

  When the camera 100 is connected to an external device such as a PC via the external interface 335, the image data is recorded on the recording medium 333 and transmitted to the external device.

4). Wireless flash timing chart <Explanation of wireless communication and flash operation>
Next, wireless communication for transmitting light emission information from the master strobe device 101 to the slave strobe device 151, and the sequence of pre-light emission and main light emission will be described with reference to the timing chart of FIG.

  4A shows a synchronous clock signal for serial communication from the camera 100 to the master strobe device 101. FIG. (B) is a data output signal from the camera 100 to the master strobe device 101, and (C) is a data output signal from the master strobe device 101 to the camera 100. These signals are exchanged between the camera 100 and the master flash device 101 via the accessory shoe joint pin 106, respectively. (D) shows a wireless optical communication signal to the slave strobe device 151 generated by the master strobe device 101 causing the xenon tube 102 to emit light intermittently in pulses, and the pre-flash and main light emission of the master strobe device 101 itself. Yes. Further, (E) shows light emission of the slave strobe device 151.

[T0] The camera 100 performs predetermined serial communication using a synchronous clock (CLK signal) via the master strobe device 101 and the accessory shoe joint pin 106, and instructs wireless pre-flash.
[T1] The master strobe device 101 causes the xenon tube 102 to emit a pulse and transmits the wireless optical communication signal Data1 to the slave strobe device 151. Data1 is configured by compressing information such as channel identification signal, light emission mode (pre-light emission, main light emission, manual light emission, etc.), operation mode (flash light emission, flat light emission, etc.), light emission time in flat light emission, light emission amount, etc. Is. The master strobe device 101 drops the DO communication line of the shoe contact to a low level during the above-described wireless transmission.
[T2] When the wireless transmission is completed, the master strobe device 101 returns the DO terminal to high. Since the DO terminal has returned to high, the camera 100 recognizes that wireless transmission from the master strobe device 101 to the slave strobe device 151 has ended.

  [T3] The camera 100 instructs the master strobe device 101 to start pre-emission by lowering the CLK signal line to a low level. The master strobe device 101 detects that the CLK communication line has fallen and starts pre-flash processing. Meanwhile, the master strobe device 101 drops the DO terminal to a low level. On the other hand, the slave strobe device 151 receives the wireless optical communication signal Data1 from the master strobe device 101 and decodes information such as a channel code, a light emission mode, a light emission time, and a light emission amount. Then, the slave flash device 151 performs pre-flash with the received light amount and flash time in synchronization with the pre-flash of the master flash device 101 described above. Detailed contents of these pre-light emission processes between t3 and t4 will be described later.

[T4] When the pre-flash is finished, the master flash device 101 returns the DO terminal to high and notifies the camera 100 of the end of the pre-flash.
[T5] The camera 100, which has recognized the end of the pre-flash, flashes in accordance with whether or not the main flash can be dimmed by serial communication via the accessory shoe joint pin 106 to the master flash device 101 and the set shutter speed of the camera 100. Send the actual flash output of.

[T6] The master strobe device 101 causes the xenon tube 102 to emit light in pulses and transmits a wireless optical communication signal Data2 including information such as the light emission amount. The master strobe device 101 drops the DO communication line to a low level during the above-described wireless transmission.
[T7] When the transmission of the wireless optical communication signal Data2 is completed, the master strobe device 101 returns the DO terminal to high and notifies the camera 100 of the completion of wireless transmission.

[T8] The camera 100 drops the CLK terminal to a low level and transmits a light emission instruction to the master flash device 101. The master strobe device 101 detects the falling edge of the CLK terminal and performs light emission (main light emission) instructed from the camera 100. Meanwhile, the master strobe device 101 drops the DO terminal to a low level. On the other hand, the slave strobe device 151 receives light emitted from the master strobe device 101 by the light receiving element 112 and detects the rising light, and performs flat main light emission based on the light emission time and light emission intensity instructed from the master strobe device 101. Thus, the main flash of the slave flash device 151 is synchronized with the main flash of the master flash device 101.
[T9] When the light emission operation is finished, the master strobe device 101 returns the DO terminal to high.

<Details of pre-flash operation>
[Description of pre-flash]
FIG. 5 is a diagram for explaining the pre-emission according to the present embodiment in detail. FIG. 7 is a flowchart for explaining the operation in the pre-flash operation of the master strobe device 101 and the slave strobe device 151. Hereinafter, the pre-emission shown in FIG. 4 will be described in more detail with reference to FIGS. 5 and 7 together with a photometric sequence when there are a plurality of cameras.

  (A), (D), and (E) of FIG. 5 respectively show in detail the operation timing at the time of pre-light emission of (A), (D), and (E) illustrated in FIG. Further, (F) is a signal for the photometry circuit 311 of the camera 100 to control the photometry of the photometry sensor 315, and shows the timing for measuring the pre-emission subject reflected light by the strobe. Although not shown in FIG. 5, steady-state light metering is also performed other than when the flash is fired, and by calculating the difference between this and the strobe light, the camera 100 has an appropriate exposure at the time of shooting. The light emission amount is transmitted to the master flash device 101 before the main light emission.

  The master strobe device 101 in this embodiment is a strobe device that does not have a flat light emission function and can only emit flash light. For this reason, if the pre-flash is performed at the same timing as when the master flash device 101 has a flat flash function, that is, the pre-flash 1 timing, the master flash device 101 ends the light emission before the camera 100 performs photometry. Further, if light emission is performed at the timing of pre-emission 2 in order to measure pre-emission of the master flash device 101, photometry is started from the beginning of the rise of the emission waveform of the slave flash device 151, and appropriate photometry cannot be performed.

  Therefore, the master flash device 101 according to the present embodiment performs pre-light emission twice, such as pre-light emission 1 and pre-light emission 2. FIG. 5A illustrates the case of the camera A having a relatively long length (T1 to T2) from the pre-flash instruction until the photometry circuit 311 starts photometry, for example, a wait time of 200 μsec. FIG. 5B illustrates the case of the camera B having a relatively short length from the pre-flash instruction until the photometry circuit 311 starts photometry (T1 to T2), for example, a wait time of 100 μsec. Yes.

  First, prior to the start of pre-flash, as shown at t0 to t1 in FIG. 4, the master flash device 101 receives a pre-flash instruction and the like through communication with the camera 100 (S701). The master strobe device 101 determines various drive parameters for pre-flash based on the received pre-flash instruction (S702). For example, as shown in FIGS. 5A and 5B, when the photometry timing differs depending on the type of camera, pre-emission 1 is performed according to the photometry timing of the camera in order to perform pre-emission 2 in accordance with the photometry timing of the camera. And the time interval of pre-emission 2 is determined.

As a method for optimizing the timing of the pre-light emission 2 according to the photometric timing of each of a plurality of types of cameras, for example, the following method can be cited.
The master strobe device 101 holds a table holding the timing of pre-flash 2 (for example, the time interval from pre-flash 1 to pre-flash 2) for each type of camera. Then, the master strobe device 101 discriminates the type of the camera by communication or the like in S701, acquires the timing corresponding to the discriminated type from the table, and determines the timing of the pre-flash 2. The type of camera can be determined by acquiring the camera ID in S701, for example.
The master strobe device 101 holds a table holding photometric timing information including the time from the pre-flash instruction to the start of photometry for each camera type. Then, the master strobe device 101 acquires photometry timing information corresponding to the camera type determined by the communication in S701 or the like from the table, and determines the timing of the pre-flash 2.
The communication content in S701 includes the timing of the pre-light emission 2 or the photometry timing information. The master flash device 101 determines the timing of the pre-flash 2 by referring to the timing of the pre-flash 2 acquired by the communication in S701 or the photometry timing information.

  The master strobe device 101 also determines a flat light emission period, a light amount, and the like of the slave strobe device 151 as drive parameters for pre-light emission. Then, as shown at t1 to t2 in FIG. 4, the master strobe device 101 notifies the slave strobe device 151 of the drive parameters used in the slave strobe device 151 by the light emission of the xenon tube 102 (S703). The slave strobe device 151 receives these pre-flash instructions, drive parameters, and the like from the master strobe device 101 (S711).

  The operation when the master strobe device 101 is connected to the camera A will be described below with reference to FIG.

  [T1] The camera 100 pulls down the CLK signal line to instruct the start of pre-flash. The master strobe device 101 detects that the CLK communication line has fallen, that is, an instruction to start pre-emission, controls the xenon tube 102 (first control process), and performs pre-emission 1 (S704, S705). ). This is light emission as a trigger for causing the slave strobe device 151 to emit light, whereby the slave strobe device 151 starts pre-light emission by flat light emission (S712, S713).

[T2] The photometry circuit 311 of the camera lowers the output signal VD to start photometry, and starts photometry.
[T3] The master strobe device 101 controls the xenon tube 102 (second control processing) while the photometric circuit 311 of the camera 100 performs photometry with the output signal VD set to low level, and performs pre-flash 2. Do. This is pre-emission performed in order to cause the camera 100 to measure subject reflected light. Based on the pre-emission photometric result, the camera 100 calculates the amount of light necessary for the main emission. In order to realize pre-light emission at such timing, pre-light emission 2 is executed after a predetermined time has elapsed from pre-light emission 1 (S706, S707). Note that the predetermined time used in S706 is set by the timing of the pre-light emission 2 determined in S702.

  [T4] The photometry circuit 311 of the camera returns the output signal VD to the original, and ends photometry. Incidentally, the pre-flash 2 of the master strobe device 101 is finished before the output signal VD returns. Further, the slave flash device 151 ends the pre-flash when the flat flash period set in S711 has elapsed (S714, S715).

  FIG. 5B illustrates the case of the camera B in which the length from the pre-flash instruction until the operation of the photometry circuit 311 starts (T1 to T2) is 100 μsec. The operation is the same as in FIG. However, the camera 100 shown in FIG. 5 (b) has a shorter time from the pre-flash instruction to the start of photometry than the camera of FIG. 5 (a). The interval of 2 is also set short.

  Further, as shown in FIGS. 5A and 5B, the photometry time (indicated by T2 to T4) of the photometry circuit 311 may differ depending on the type of the camera 100, and the pre-light emission 2 When the amount of light is large, there may be a situation in which the light emission is not yet finished at the end of photometry. Further, due to the characteristics of the photometry circuit 311, there may be a situation where photometry cannot be performed when the amount of pre-emission light is large. Therefore, in addition to controlling the photometry timing of the pre-light emission 2, the light emission amount of the pre-light emission 2 may be controlled.

  As described above, in the camera system according to the present embodiment, the master strobe device 101 performs pre-flash while the camera 100 performs photometry and the slave strobe device 151 performs flat light emission for a predetermined period. It is guaranteed to perform the flashing.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (8)

A camera system comprising: an imaging device; a first light-emitting device that is built in or removable from the imaging device; and a second light-emitting device that is separate from the imaging device and the first light-emitting device,
The first light emitting device includes:
A first control for controlling the light emitting means to perform flash light emission for starting the pre-light emission in the second light-emitting device in response to a pre-light emission instruction from the imaging device;
A light emission control means for performing a second control for controlling the light emission means so as to perform a flash light emission for photometry by the imaging device after a lapse of a predetermined time from the flash light emission by the first control,
The second light emitting device includes:
A camera system that performs flat light emission for photometry by the imaging device in response to flash light emission by the first control.   The predetermined time in the second control is set so that flash light emission is executed while the second light emitting device is executing flat light emission within a period during which the imaging device performs the photometry. The camera system according to claim 1, wherein: The first light emitting device is detachable from a plurality of types of imaging devices,
Holding means for holding a time interval from flash emission by the first control to flash emission by the second control in correspondence with the type of detachable imaging device;
Discriminating means for discriminating the type of the imaging device by communication with the mounted imaging device;
The said light emission control means sets the time interval currently hold | maintained according to the kind of imaging device discriminate | determined by the said discrimination means from the said holding means as the said predetermined time. The camera system described. The first light emitting device is detachable from a plurality of types of imaging devices,
Corresponding to the type of detachable imaging device, holding means for holding photometric timing information including the time from the pre-flash instruction to the start of photometry,
Discriminating means for discriminating the type of the imaging device by communication with the mounted imaging device;
The light emission control means determines the predetermined time from the holding means based on photometric timing information held corresponding to the type of the imaging device determined by the determination means. Or the camera system of 2. The first light emitting device includes:
Further comprising an acquisition means for acquiring photometric timing information including a time from the pre-flash instruction to the start of photometry through communication with the imaging device,
3. The camera system according to claim 1, wherein the light emission control unit determines the predetermined time based on photometric timing information acquired by the acquisition unit. A light-emitting device that can be built into or removed from the imaging device,
A first control for controlling the light emitting means to perform flash emission for starting a separate light emitting device in response to a pre-light emission instruction from the imaging device;
And a second control for controlling the light emitting means to perform flash light emission for light metering by the imaging device after a lapse of a predetermined time from the flash light emission by the first control. A light emitting device characterized. A control method for a camera system, comprising: an imaging device; a first light emitting device that is built in or removable from the imaging device; and a second light emitting device that is separate from the imaging device and the first light emitting device. And
The first control for controlling the light emitting means so that the first light emitting device performs flash light emission for starting the pre-light emission to the second light emitting device in response to the pre-light emission instruction from the imaging device. Process,
A second control step in which the first light emitting device controls the light emitting means so as to perform flash light emission for photometry by the imaging device after a lapse of a predetermined time from the flash light emission in the first control step; ,
The second light-emitting device includes a step of performing flat light emission for the photometry by the imaging device in response to flash light emission by the first control step. A method for controlling a light-emitting device that is built in or removable from an imaging device,
A first control step in which the first control means controls the light emitting means so as to perform flash light emission for causing the separate light emitting device to start pre-light emission in response to a pre-light emission instruction from the imaging device; ,
And a second control step in which a second control means performs a flash emission for photometry by the imaging device after a predetermined time has elapsed since the flash emission in the first control step. Method.

Images