JP4040290B2 - Imaging apparatus and imaging system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a photographing apparatus that performs strobe light emission toward a subject and calculates a light emission amount for obtaining an appropriate exposure before photographing.
[0002]
[Prior art]
Japanese Patent No. 2823248 discloses an imaging system that performs preliminary light emission toward a subject and can determine whether or not the subject is properly exposed prior to the main light emission. In this device, the overexposure amount is calculated and output based on photometric data obtained by preliminary light emission under the set photographing conditions.
[0003]
In addition, in the one described in Japanese Patent Laid-Open No. 9-61909 previously proposed by the applicant, preliminary light emission is performed with respect to the subject with a predetermined light amount prior to the main light emission, and whether or not shooting with an appropriate light amount is possible. indicate.
[0004]
[Problems to be solved by the invention]
However, in the photographing apparatus disclosed in the above-mentioned Japanese Patent No. 2823248, since the strobe is pre-lighted under the same conditions (light quantity) as in photographing, photometry and calculation are performed, so that the subject is far away or the depth of field is deepened. For example, when the aperture is narrowed down, the strobe emits light with a large amount of light, so that the loss of energy is large and it takes time until the charging is completed.
[0005]
Further, in the proposal proposed in the above-mentioned Japanese Patent Laid-Open No. 9-61909, it is possible to determine whether or not dimming is possible in the automatic dimming mode, but when the strobe is in the manual flash mode, the set manual flash amount is set. On the other hand, there is a problem that it cannot be determined whether or not photographing can be performed with an appropriate amount of light.
[0006]
Here, the flash photography using manual flash will be described. FIG. 17 shows an example in which a highly reflective object such as a watch or a jewel is photographed with a flash.
[0007]
In the figure, reference numeral 400 denotes a photographing stand, 401 denotes a subject clock, 402 denotes a light source such as a strobe, and 403 denotes a diffuser such as translucent tracing paper used for softly diffusing the light of the strobe 402.
[0008]
The strobe 402 may be connected to a camera (not shown) with a connection cord, or may be controlled by communication with a wireless strobe control system described in Japanese Patent Laid-Open No. 2000-89306 proposed by the present applicant. Good.
[0009]
For a subject whose surface is metal, such as the watch 401 shown in the figure, or a subject that reflects light without diffusing light, such as glass or jewelry, stable exposure cannot be obtained by so-called automatic light control.
[0010]
This is because when the orientation or position of the subject 401 changes even a little, the reflected light of the light source 402 changes on the surface of the subject 401, so that stable light control cannot be performed.
[0011]
Therefore, when taking a stroboscopic shot of such a subject, it is common practice to place an incident light type strobometer near the subject 401, test light emission with the same amount of light as when shooting, and determine the exposure. is there. Therefore, such shooting is difficult for general users who often have only a camera and a strobe.
[0012]
An object of the present invention is to provide a photographing apparatus capable of easily determining an appropriate light emission amount without using a dedicated strobe meter in a manual light emission mode in which a user sets the light emission amount.
[0013]
Another object of the present invention is to make it possible to control one or a plurality of lighting devices from the camera body side by communication.
[0017]
[Means for Solving the Problems]
  This applicationFirst1In the invention, in the photographing apparatus that emits the illumination means including the light emission amount setting means that enables the selective setting of the light emission amount at the time of photographing, the photometry means that measures the object illuminated by each illumination means;pluralPrior to the main light emission, the lighting means are sequentiallyBy making selective settingsPreliminary light emission at a predetermined light emission amount is set as the photometric result by the photometric means at the time of preliminary light emission.Shooting conditionsBased on, Using multiple lighting meansThe target shooting light quantity at the time of shooting with the main flash is calculated, and the target shooting light quantity is calculated and the main flash quantity as the sum of the flash quantities set by the respective flash quantity setting means in each illumination means is shot.DoAnd a display means for displaying the difference between the target photographing light quantity calculated by the computing means and the set photographing light quantity.
[0018]
  In addition, this application2According to the invention, in the photographing apparatus for emitting a plurality of illumination means including the light emission amount setting means that enables selective setting of the light emission amount at the time of photographing, the photometry means for measuring the object illuminated by each illumination means; , Each lighting means in turn prior to the main flash,By making selective settingsPreliminary light emission at a predetermined light emission amount is set as the photometric result by the photometric means at the time of preliminary light emission.Shooting conditionsAnd based on, Using multiple lighting meansCalculates the target flash output for main flash and calculates the target flash outputWhenFor flash intensity setting meansMore settingsMain light emission of each illuminated meansLight emission at timeA calculation means for calculating a difference from the sum of the amounts, a target light emission amount calculated by the calculation means, and the set main emissionLight emission at timeamountSum ofDisplay means for displaying the difference between them.
[0019]
  That is, the above1And second2In this invention, a target photographing light quantity (for example, an appropriate exposure amount) calculated based on a photometric result of preliminary light emission of a plurality of illumination means such as a strobe and various photographing conditions set such as an aperture, a shutter speed, and a light sensitivity. Or, how much difference is there between the set shooting light amount or the set main flash amount when shooting is performed with the total flash amount (main flash amount) of each illumination means manually set by the photographer with respect to the target flash amount? By displaying in the viewfinder field, etc., the photographer is encouraged to change the setting of the flash output and shooting conditions manually set, so that appropriate exposure can be easily obtained without using a strobe meter during manual flash photography. Making it possible.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 mainly shows an optical configuration of a strobe photographing system including a single-lens reflex camera (imaging device) according to the first embodiment of the present invention and a strobe (illuminating means, illumination device) attached to the camera. Is shown.
[0023]
Reference numeral 1 denotes a camera body, and a photographing lens 11 is mounted on the front surface thereof. An optical component, a mechanical component, an electric circuit, and an image sensor such as a film or a CCD are accommodated in the camera body 1 so that a photograph or an image can be taken.
[0024]
Reference numeral 2 denotes a main mirror, which is obliquely installed in the photographing optical path in the viewfinder observation state and retracts out of the photographing optical path in the photographing state. Further, the main mirror 2 is a half mirror, and when it is obliquely arranged in the photographing optical path, approximately half of the light beam from the subject is transmitted to a focus detection optical system described later.
[0025]
Reference numeral 3 denotes a focusing plate disposed on the planned imaging plane of the photographing lenses 12 to 14 constituting the finder optical system, and 4 is a pentaprism for changing the finder optical path.
[0026]
Reference numeral 5 denotes an eyepiece, and the photographer can observe the photographing screen by observing the focus plate 3 from this window.
[0027]
Reference numerals 6 and 7 denote an imaging lens and a photometric sensor for measuring the luminance of the object in the viewfinder observation screen, and the imaging lens 6 conjugates the focus plate 3 and the photometric sensor 7 via the reflected light path in the pentaprism 4. Is related to
[0028]
Reference numeral 8 denotes a focal plane shutter. 9 is a photosensitive member, and an imaging element such as a silver salt film or a CCD is used.
Reference numeral 25 denotes a sub-mirror, which is tilted along with the main mirror 2 in the photographing optical path in the viewfinder observation state and retracts out of the photographing optical path in the photographing state. The sub-mirror 25 bends the light beam transmitted through the oblique main mirror 2 and guides it toward the focus detection unit 26.
[0029]
The focus detection unit 26 includes a secondary imaging mirror 27, a secondary imaging lens 28, a focus detection line sensor 29, and the like. The secondary imaging mirror 27 and the secondary imaging lens 28 constitute a focus detection optical system, and the secondary imaging surface of the photographing lens 11 is formed on the focus detection line sensor 29.
[0030]
The focus detection unit 26 detects the focus adjustment state of the photographic lens 11 by a so-called phase difference detection method, and the detection result is sent to an automatic focus detection device that controls the focus adjustment mechanism of the photographic lens.
[0031]
A mount contact group 10 serves as a communication interface between the camera body 1 and the photographing lens 11. Reference numerals 12 to 14 denote lenses. The first group lens 12 moves back and forth on the optical axis to adjust the focus position of the shooting screen. The second group lens 13 moves back and forth on the optical axis, thereby changing the focal length of the photographing lens 11 and zooming the photographing screen. Reference numeral 14 denotes a fixed three-group lens, and reference numeral 15 denotes an aperture.
[0032]
Reference numeral 16 denotes a focus drive motor that moves the first group lens 12 in the optical axis direction, and moves the first group lens 12 back and forth by an automatic focus adjustment operation. Reference numeral 17 denotes a diaphragm drive motor which drives the diaphragm 15 so as to change the aperture diameter.
[0033]
An external strobe 18 is attached to the camera body 1 and performs light emission control in accordance with a signal from the camera body 1.
[0034]
Reference numeral 19 denotes a xenon tube, which converts current energy into emission energy. Reference numerals 20 and 21 denote a reflector and a Fresnel lens, each of which plays a role of efficiently condensing light emission energy toward a subject.
[0035]
A strobe contact group 22 serves as a communication interface between the camera body 1 and the strobe 18.
[0036]
A glass fiber 30 guides a part of the light emitted from the xenon tube 19 to the first light receiving element 31 such as a photodiode in order to monitor the light emission amount of the xenon tube 19. As a result, the amount of preliminary light emission and main light emission of the strobe 18 can be monitored.
[0037]
Reference numeral 32 denotes a second light receiving element such as a photodiode for monitoring light emitted from the xenon tube 19. By the output of the second light receiving element 32, the light emission current of the xenon tube 19 is limited to control the flat light emission.
[0038]
Reference numerals 20a and 20b denote light guides integrated with the reflective shade 20, which reflects and guides part of the light from the xenon tube 19 to the light receiving element 32 or the fiber 30.
[0039]
Next, the electric circuit configuration of the flash photographing system will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same component as FIG.
[0040]
First, an electric circuit configuration in the camera body 1 will be described. The camera microcomputer (calculation means, control means) 100 operates based on the clock signal generated by the oscillator 101. The camera microcomputer 100 is connected to a focus detection circuit 105, a photometry circuit 106, a shutter control circuit 107, a motor control circuit 108, a switch sense circuit 110, and a liquid crystal display circuit 111. Further, the lens control circuit 112 disposed in the photographing lens 11 performs signal transmission via the mount contact 10, and the strobe microcomputer 200 provided in the strobe 18 transmits signal via the strobe contact group 22. Do.
[0041]
The focus detection circuit 105 performs accumulation control and readout control of the CCD line sensor 29 that is a distance measuring element in accordance with a signal from the camera microcomputer 100, and outputs each pixel information to the camera microcomputer 100. The camera microcomputer 100 A / D converts this information and detects the focus adjustment state by the phase difference detection method. The camera microcomputer 100 performs focus adjustment control of the photographing lens 11 by exchanging signals with the lens microcomputer 112.
[0042]
The photometry circuit 106 outputs an output from the photometry sensor 7 to the camera microcomputer 100 as a luminance signal of the subject. The photometry circuit 106 outputs a luminance signal in both a steady state where the strobe light is not preliminarily emitted toward the subject and a state where the strobe light is preliminarily emitted, and the camera microcomputer 100 A / D converts the luminance signal. Then, calculation of the aperture value and shutter speed for adjusting exposure for photographing and calculation of the flash emission amount at the time of exposure are performed.
[0043]
The shutter control circuit 107 performs energization control of the shutter front curtain drive magnet MG-1 and the shutter rear curtain drive magnet MG-2 constituting the focal plane shutter 8 in accordance with a signal from the camera microcomputer 100, and travels through the front curtain and the rear curtain. And perform the exposure operation.
[0044]
The motor control circuit 108 controls the motor in accordance with a signal from the camera microcomputer 100 to perform up / down of the main mirror 2 and shutter charge.
[0045]
The film running detection circuit 109 detects whether or not the film has been wound up by one frame when the film is fed in the case of a silver halide camera, and sends a signal to the camera microcomputer 100. Note that this film running detection circuit 109 is not provided in the case of a digital camera that captures an image with an image sensor.
[0046]
SW1 is a switch that is turned on by a first stroke (half-press) operation of a release button (not shown) to start photometry and AF (automatic focus adjustment). SW2 is a switch that is turned on by a second stroke (full press) operation of the release button and starts shutter running, that is, an exposure operation.
[0047]
SWFELK is a switch for independently performing preliminary light emission described later. SW1, SW2, SWFELK and other operation members (not shown) such as a sensitivity setting switch, an aperture setting switch, and a shutter speed setting switch are detected by the switch sense circuit 110 and sent to the camera microcomputer 100. .
[0048]
The liquid crystal display circuit 111 controls the in-viewfinder display 24 and the monitor external display 42 in accordance with signals from the camera microcomputer 100.
[0049]
Next, an electric circuit configuration in the photographing lens 11 will be described. The camera body 1 and the photographing lens 11 are electrically connected to each other via a lens mount contact 10. This lens mount contact 10 is used for serial data communication with a contact L0 that is a power contact for the focus drive motor 16 and the aperture drive motor 17 in the photographing lens 11 and a power contact L1 for the lens microcomputer 112. A clock contact L2, a data transmission contact L3 from the camera body 1 to the photographing lens 11, a data transmission contact L4 from the photographing lens 11 to the camera body 1, a motor ground contact L5 to the motor power supply, a lens It comprises a ground contact L6 for the power supply for the microcomputer 112.
[0050]
The lens microcomputer 112 is connected to the camera microcomputer 100 via these lens mount contacts 10 and operates the first group lens driving motor 16 and the aperture motor 17 in accordance with signals from the camera microcomputer 100 to adjust the focus of the photographing lens 11. And control the aperture. Reference numerals 35 and 36 denote a photodetector and a pulse plate, and the lens microcomputer 112 obtains position information of the first lens group 12 by counting the number of pulses. Thereby, the focus of the photographic lens 11 can be adjusted.
[0051]
Next, the configuration of the strobe 18 will be described with reference to FIG. 201 is a power supply battery. A DC-DC converter 202 boosts the battery voltage to several hundred volts.
[0052]
Reference numeral 203 denotes a main capacitor for accumulating light emission energy. Reference numerals 204 and 205 denote resistors, which divide the voltage of the main capacitor 203 into a predetermined ratio.
[0053]
206 is a coil for limiting the light emission current, 207 is a diode for absorbing the back electromotive voltage generated when light emission is stopped, and 19 is a Xe (xenon) tube. 211 is a trigger generation circuit, and 212 is a light emission control circuit such as an IGBT.
[0054]
A data selector 230 selects D0, D1, and D2 and outputs them to Y by a combination of two inputs Y0 and Y1. Reference numeral 231 denotes a light emission level control comparator for flat light emission, and reference numeral 232 denotes a light emission amount control comparator for flash light emission.
[0055]
A photodiode 32 is a light receiving sensor for flat light emission control, and monitors the light output of the Xe tube 19. A photometric circuit 234 amplifies a minute current flowing through the photodiode 32 and converts the photocurrent into a voltage.
[0056]
Reference numeral 31 denotes a photodiode which is a light receiving sensor for controlling flash emission and monitors the light output of the Xe tube 19. Reference numeral 236 denotes an integral photometry circuit for logarithmically compressing the photocurrent flowing through the photodiode 31 and compressing and integrating the light emission amount of the Xe tube 19.
[0057]
A flash microcomputer 238 controls the operation of the entire flash 18, and a contact group 22 is provided on the hot shoe to communicate with the camera body 1.
[0058]
Reference numeral 240 denotes a liquid crystal display as a display for displaying the operation state of the strobe 18. Reference numeral 241 denotes a wireless selector switch for setting the wireless operation state of the strobe 18. Reference numeral 242 denotes a power switch for switching the power on / off of the strobe 18. Reference numeral 243 denotes an LED for indicating completion of charging of the flash 18, and 244 is a dimming display LED for displaying that the flash 18 has emitted an appropriate amount of light.
[0059]
245 is a motor control circuit, and 246 is a motor for setting the irradiation angle by moving the Xe tube 19 and the reflective shade 20 in accordance with the focal length of the taking lens 1 mounted on the camera body 1.
[0060]
  247 is a backlight lighting switch for illuminating the liquid crystal display 240, 248 is a mode switch for selecting the light emission mode of the strobe 18, and 249 is a parameter associated with the light emission mode (for example, light emission amount during manual light emission). A switch for selection, 250 is an up switch for increasing the parameter, and 251 is a down switch for decreasing the parameter. The outputs of these switches 249 to 251 are input to the strobe microcomputer 238, and the strobe microcomputer 238 sets the light emission amount at the time of manual light emission according to the input from the switches 249 to 251.In addition, Switches 249 to 251 and strobe microcomputer 238LuminescenceSetting means is configured.
[0061]
Reference numeral 252 denotes a zoom switch for manually setting the emission irradiation angle, and reference numerals 253, 254, and 255 denote encoders for detecting the emission irradiation angle (that is, the positions of the Xe tube 19 and the reflection shade 20).
[0062]
Reference numeral 256 denotes a photodiode for receiving control information from the camera body 1 in the wireless slave mode, and reference numeral 257 denotes a light receiving circuit that amplifies the photocurrent flowing through the photodiode 256 and converts it into a voltage.
[0063]
Next, each terminal of the flash microcomputer 238 will be described. CNT is a control output terminal for controlling charging of the DC / DC converter 2, LCDS is a wiring group for displaying and lighting the liquid crystal 240, COM 1 is a control output terminal corresponding to the ground potential of the switch 241, and NORM is an operation state of the strobe 18. Is an input terminal that is selected in the normal shooting state (not in the wireless mode), MASTER is connected to the camera body 1 using the wireless master mode, that is, the hot shoe contact group 22 in the operation state of the strobe, and controls the operation of the wireless slave strobe. This is an input terminal that is selected when it is in a controlled state.
[0064]
In SLAVE, the strobe 18 is in the wireless slave mode, that is, the strobe 18 is installed at a position away from the camera body 1, and the light-emission control light signal from the master strobe is received by the light receiving element 256 to control the light emission of the strobe 18. This is an input terminal that is selected when it is in a state.
[0065]
COM2 is a control output terminal corresponding to the ground potential of the switch 242, OFF is an input terminal that is selected when the strobe 18 is turned off, ON is an input terminal that is selected when the strobe 18 is turned on, and SE is a time when the strobe 18 is at a predetermined time. This input terminal is selected when the power is turned off after elapse.
[0066]
CLK is an input terminal for a synchronous clock for serial communication with the camera body 1, DO is a serial output terminal for transferring serial data from the strobe 18 to the camera body 1 in synchronization with the synchronous clock, and DI is a synchronous clock. It is a serial data input terminal for transferring serial data from the camera body 1 to the strobe 18 in synchronization.
[0067]
M0 and M1 are output terminals for controlling the motor driver 245, ZOOM0, ZOOM1 and ZOOM2 are input terminals for inputting the encoders 253, 254 and 255 indicating the zoom position, and COM0 corresponds to a ground potential of the zoom encoder or the like. A control output terminal, ZOOM is an input terminal of the zoom position setting switch 252 described above, DOWN is an input terminal of the light emission parameter decrease switch 251, and UP is an input terminal of the light emission parameter increase switch 250.
[0068]
SEL / SET is the input terminal of the data selection switch 249, MODE is the input terminal of the light emission mode selection switch 248, LIGHT is the input terminal of the illumination switch 247, and YIN is for detecting the output state of the data selector 230. Input terminal.
[0069]
INT is an integration control output terminal of the photometric integration circuit 236, AD0 is an A / D conversion input terminal for reading an integral voltage indicating the light emission amount of the photometry integration circuit 236, and DA0 outputs a comparator voltage of the comparators 231 and 232 This is a D / A output terminal.
[0070]
Y0 and Y1 are output terminals in the selected state of the data selector 230, and TRIG is an output terminal of the light emission trigger.
[0071]
FIG. 4 shows an external configuration of the strobe 18. Each switch, display, and the like are denoted by the same reference numerals as those in FIG. Reference numeral 258 denotes a light receiving window of the above-described photodiode 256, in which the photodiode 256 is disposed.
[0072]
Next, the operation of the flash photographing system will be described with reference to the flowchart of FIG.
[0073]
When the power switch 242 of the strobe 18 is turned on, the strobe microcomputer 238 starts operation. When the setting switch 248 is operated, the strobe 18 is set to the manual light emission mode.
[0074]
Next, when the up switch 250 or the down switch 251 is operated, the flash microcomputer 238 sets the light emission amount of manual light emission. The setting state of the strobe 18 is displayed on a display 240 provided on the back of the strobe 18.
[0075]
Here, FIG. 6 is a display example of the display 240 when the manual light emission mode is set, 301 is a display member of the set mode (manual M in the figure), 302 is an irradiation angle of the strobe 18. And a display member 303 for displaying the set light emission amount.
[0076]
[# 100]
When the switch SWFELK of the camera body 1 shown in FIG. 2 is turned on, the camera microcomputer 100 measures the luminance BVa of the subject with the steady light by the photometric sensor 7.
[0077]
[# 101]
The camera microcomputer 100 determines an exposure value (BVs) from a measured subject luminance value BVa by a known algorithm. Then, a shutter speed value (TV) and an aperture value (AV) are determined according to the set shooting mode of the camera.
[0078]
[# 102]
Next, the camera microcomputer 100 commands the flash microcomputer 238 to perform preliminary light emission by serial communication through the communication terminals S0, S1, and S2. The flash microcomputer 238 receives this preliminary light emission command and performs a preliminary light emission operation with a predetermined light amount.
[0079]
The preliminary light emission operation will be described below.
[0080]
<Preliminary light emission operation>
The strobe microcomputer 238 sets a predetermined voltage at the DA0 terminal in accordance with a predetermined light emission level instructed from the camera body 1. Next, Hi and Lo are output to SEL1 and SEL0, and the input D2 is selected. At this time, since the Xe tube 19 has not yet emitted light, the photocurrent of the light receiving element 32 hardly flows, the output of the monitor circuit 234 input to the inverting input terminal of the comparator 231 is not generated, and the output of the comparator 231 is Hi. Therefore, the light emission control circuit 212 is turned on.
[0081]
Next, when a trigger signal is output from the TRIG terminal, the trigger circuit 211 excites the Xe tube 19 that has generated a high voltage to start light emission.
[0082]
On the other hand, the stroboscopic microcomputer 238 instructs the integration circuit 236 to start integration, and the integration circuit 232 starts integration of the output of the monitor circuit 236, that is, the logarithmically compressed photoelectric output of the light receiving element 31 for light intensity integration. Start a timer that counts time.
[0083]
When the preliminary light emission is started, the photocurrent from the light emission level control light receiving element 32 for flat light emission increases, and the output of the monitor circuit 234 increases. When the output of the monitor circuit 234 becomes higher than a predetermined comparator voltage set to the non-inverting input of the comparator 205, the output of the comparator 231 is inverted to Lo, and the light emission control circuit 212 changes the light emission current of the Xe tube 19 Cut off. As a result, the discharge loop is interrupted, but a recirculation loop is formed by the diode 209 and the coil 206, and the light emission current gradually decreases after the overshoot due to the delay of the circuit is settled.
[0084]
As the light emission current decreases, the light emission level decreases, so the photocurrent of the light receiving element 32 decreases and the output of the monitor circuit 234 also decreases. When the voltage drops below a predetermined comparator level, the output of the comparator 231 is inverted again to Hi, the light emission control circuit 212 is turned on again, a discharge loop of the Xe tube 19 is formed, and the light emission current increases to increase the light emission level. Will also increase.
[0085]
As described above, the comparator 231 repeats the increase and decrease of the light emission level in a short cycle around the predetermined comparator voltage set to DA0, and as a result, the flat light that continues the light emission at the desired substantially constant light emission level. Light emission is controlled.
[0086]
When a predetermined light emission time elapses due to the above-described timer count, the flash microcomputer 238 sets the SEL1 and SEL0 terminals to Lo and Lo. As a result, the input of the data selector 206 is selected as D0, that is, the Lo level input, the output is forced to the Lo level, and the light emission control circuit 212 interrupts the discharge loop of the Xe tube 19. Thereby, preliminary light emission (flat light emission) is completed.
[0087]
At the end of light emission, the flash microcomputer 238 reads the output of the integration circuit 236 integrating the preliminary light emission amount from the A / D input terminal AD0 and performs A / D conversion, and uses the integrated value, that is, the light emission amount at the time of preliminary light emission as a digital value. read.
[0088]
[# 103]
The subject reflected light due to the preliminary light emission is received by the photometric sensor 7 of the camera body 1 through the photographing lens 11. The light receiving current of the photometric sensor 7 is read by the camera microcomputer 100 via the photometric circuit 108, whereby the subject brightness BVf by the strobe reflected light is measured.
[0089]
[# 104]
The camera microcomputer 100 extracts the luminance value of only the reflected light due to the preliminary light emission according to the following equation (1) by subtracting the subject luminance BVa obtained by the natural light obtained from # 100 from the subject luminance BVf during the preliminary light emission.
[0090]
dF = LN2 (2 ^ BVf-2 ^ BVa) (1)
[# 105]
Next, the relative ratio γ of the main light emission that is appropriate for the preliminary light emission is obtained from the following equation (2) from the luminance value df of only the reflected light by the preliminary light emission obtained in # 104.
[0091]
γ = LN2 (2 ^ BVs-2 ^ BVa) -dF (2)
[# 106]
Next, the camera microcomputer 100 acquires the apex value GV of the set manual light emission amount from the strobe 18. This GV value is determined in the strobe 18 as follows.
[0092]
For example, if the set flash amount is 1/64 of full flash,
GV = LN2 (1/64) =-6
Therefore, when the light emission amount PV of the preliminary light emission is 1/32 of the full light emission, the light amount difference DV between the preliminary light emission and the set manual light emission amount is
DV = GV-PV (3)
(Where PV is the apex value of the preliminary light emission amount, and GV is the apex value of the manual light emission amount).
[0093]
[# 106]
Next, the difference between γ obtained by the above-described equation (2) and DV obtained by the equation (3) is calculated.
[0094]
Dif = γ−DV
That is, this Dif is a difference from the target photographing light amount (appropriate exposure amount) in strobe photographing.
[0095]
[# 107]
The camera microcomputer 100 displays the difference Dif from the target photographing light quantity obtained in # 106 on the in-finder display 24 of the camera body 1. FIG. 7 shows an example of this display.
[0096]
That is, the display next to the viewfinder shows the exposure amount (exposure) under the current shooting conditions (aperture, light sensitivity of the film, strobe emission amount, etc.) with respect to the appropriate exposure amount (appropriate light amount level) indicated by the center mark in the vertical direction. Level) difference is displayed. Thereby, the photographer can recognize the excess or deficiency of the exposure amount when photographing is performed under the current photographing condition with respect to the appropriate exposure amount.
[0097]
FIG. 8 shows a display example on the display 240 on the back of the strobe. Similar to the display in the viewfinder, the exposure level indicator 304 displays the difference in exposure amount under the current shooting conditions with respect to the appropriate exposure amount indicated by the scale in the center in the left-right direction. Reference numeral 305 denotes a distance (4 m in the figure) at which an appropriate amount of light can be obtained under the current shooting conditions.
[0098]
[# 108]
If SW2 (release SW) is on, the process proceeds to # 109, and if it is off, the process returns to # 105.
[0099]
In other words, once the preliminary flash is performed, the current setting displayed in the viewfinder or on the back of the flash is changed by the photographer changing the aperture or changing the manual flash output unless the subject distance is changed. Since the difference between the exposure amount and the appropriate light amount is updated, the photographer can set an appropriate strobe light amount or aperture value while viewing this display.
[0100]
Regarding the determination of the exposure by the preliminary light emission, when photographing a reflective object such as a watch or a jewel as described with reference to FIG. 17, the exposure is not determined by the subject itself, but a standard reflection with a reflectance of 18% in advance. More stable exposure can be obtained by photometry using a plate.
[0101]
[# 109]
When SW2 is turned on, the release sequence is started. If the shutter speed is equal to or lower than the tuning speed, the process branches to # 110.
[0102]
[# 110]
When the shutter speed is equal to or lower than the synchronization speed, the camera microcomputer 100 transmits a flash emission mode to the flash microcomputer 238.
[0103]
[# 111]
When the shutter speed is faster than the synchronization speed, the camera microcomputer 100 transmits the FP light emission mode and the FP light emission time to the flash microcomputer 238. This FP emission time is the shutter speed plus the curtain speed.
[0104]
[# 112]
At the same time as the main mirror 2 is flipped up and retracted from the photographing optical path, the camera microcomputer 100 instructs the lens microcomputer 112 to narrow down the diaphragm 36.
[0105]
[# 113]
Wait until the main mirror 2 is completely retracted from the photographing optical path.
[0106]
[# 114]
When the main mirror 2 fully jumps up, the camera microcomputer 100 energizes the front curtain drive magnet MG-1, and starts the opening operation of the focal plane shutter 8.
[0107]
[# 115]
If the light emission mode is the FP light emission mode, the process proceeds to # 117. If the light emission mode is the flash light emission mode, the process proceeds to # 116.
[0108]
[# 116]
In the flash emission mode, the process waits until the front curtain of the focal plane shutter 8 is completely opened and an X contact (not shown) is turned on. When this is turned on, the process proceeds to # 117.
[0109]
[# 117]
The camera microcomputer 100 performs main light emission control according to the light emission mode. That is, in the FP light emission mode, FP light emission control is performed on the strobe 18 and in the flash light emission mode, flash light emission control is performed.
[0110]
<Flash emission control>
When the shutter speed of the camera is equal to or lower than the flash synchronization speed, flash emission control is performed. Here, the camera microcomputer 100 first outputs a control voltage corresponding to the set manual light emission amount to the DA0 terminal of the flash microcomputer 238. This voltage is a voltage obtained by adding a control voltage corresponding to a light amount difference between preliminary light emission and main light emission to the output voltage of the integration circuit 236 described at the time of preliminary light emission, that is, the integrated voltage.
[0111]
For example, if the integral light emission is the same 1/32 when the integrated voltage when the pre-light emission is 1/32 of the full light emission amount is V1, the light emission may be stopped when the same integrated voltage is reached. Therefore, V 1 is set as the comparator voltage of the comparator 232.
[0112]
Similarly, when the main light emission amount is 1/16, the light emission may be stopped when the integrated voltage is increased by one stage relative to the preliminary light emission. The corresponding voltages are added and set as the comparator voltage of the comparator 323.
[0113]
Next, the camera microcomputer 100 outputs [0, 1] to the Y1 and Y0 terminals of the flash microcomputer 238, and selects the flash light emission control comparator 232 connected to the D1 input of the data selector 230.
[0114]
At this time, since the Xe tube 19 has not yet emitted light, almost no photocurrent flows through the photodiode 31. For this reason, the output of the integrating circuit 236 is not generated, and the negative input voltage of the comparator 232 is lower in potential than the positive input terminal. Accordingly, the output voltage of the comparator 232 is at a high level, and the light emission control circuit 212 is turned on.
[0115]
At the same time, the flash microcomputer 238 outputs a Hi signal from the TRIG terminal for a predetermined time. Thereby, the trigger circuit 211 generates a high trigger voltage. When a high voltage is applied to the trigger electrode of the Xe tube 18, the Xe tube 19 starts to emit light.
[0116]
When the Xe tube 19 starts to emit light, a high current flows through the photodiode 31, the output of the integration circuit 236 increases, and when the voltage reaches a predetermined voltage set at the + input terminal of the comparator 232, the comparator 232 is inverted, The output voltage becomes low level, and the light emission control circuit 212 is cut off, so that light emission is stopped.
[0117]
At this point, the Xe tube 19 generates a predetermined amount of light emission and stops light emission, and a desired light amount necessary for flash photography can be obtained.
[0118]
<FP (flat) light emission control>
When the shutter speed of the camera is faster than the flash synchronization speed, FP light emission control is performed.
[0119]
The camera microcomputer 100 outputs a control voltage corresponding to the set manual FP light emission amount to the DA0 terminal of the flash microcomputer 238. That is, a voltage obtained by adding a control voltage corresponding to a light amount difference between the preliminary light emission and the main light emission to the voltage set as the comparator voltage of the comparator 231 at the time of the preliminary light emission.
[0120]
For example, if the control voltage when the preliminary light emission is 1/32 of the full light emission is V1, and the main light emission is the same 1/32 light emission, the FP light emission control may be performed with the same control voltage. V1 is set as the comparator voltage of the comparator 232.
[0121]
Similarly, when the main light emission amount is 1/16, the control voltage may be larger by one stage than the preliminary light emission. Therefore, a voltage corresponding to one stage is added to the integrated voltage at the time of preliminary light emission, and the comparator. This is set as the comparator voltage 231.
[0122]
Next, the camera microcomputer 100 outputs [1, 0] to the Y1, Y0 terminals of the flash microcomputer 238, and selects the flash light emission control comparator 231 connected to the D1 input of the data selector 230. Thereafter, FP light emission is performed in the same operation as the preliminary light emission operation described above, and when a predetermined time instructed from the camera microcomputer 100 has elapsed, the Y1 and Y0 terminals of the camera microcomputer 238 are set to [0, 0]. The light emission process ends.
[0123]
[# 118]
When a predetermined shutter opening time has elapsed, the camera microcomputer 100 energizes the rear curtain drive magnet MG-2, closes the rear curtain of the shutter 8, and ends the exposure. If the light emission mode of # 117 is FP light emission, light emission continues until the rear curtain is completely closed.
[0124]
[# 119]
When a series of photographing sequences is completed, the main mirror 2 is lowered and photographing is finished.
[0125]
As described above, according to the present embodiment, the appropriate exposure amount in manual flash photography is calculated based on the photometry result of the subject by preliminary light emission and the photographing conditions including the set flash emission quantity, and this appropriate exposure is calculated. Since it is possible to check before and after the exposure amount when shooting with the flash amount manually set for the flash amount before shooting, manual flash shooting with an appropriate flash amount is possible without using a strobe meter Become.
[0126]
(Second Embodiment)
9 and 10 show a configuration of a flash photographing system according to the second embodiment of the present invention. In the present embodiment, there are a plurality of strobes set to the manual light emission mode, and an appropriate exposure amount can be determined even when the strobe light is emitted with different amounts.
[0127]
FIG. 9 shows an example of shooting using two strobes, a master strobe MS mounted on the camera body 1 and another slave strobe SSB installed at a position away from the camera body 1. Yes.
[0128]
The master strobe MS itself illuminates the subject and also generates a light signal by minute light emission to control the slave strobe SSB. Hereinafter, such a mode is referred to as a master light emission mode. As a group B strobe, the slave strobe SSB receives the control information of the master strobe MS and controls the light emission mode and the light emission amount.
[0129]
Further, in FIG. 10, the master strobe MS mounted on the camera body 1 transmits only the control signal for slave strobe control, and the slave strobe SSA and the slave strobe SSB receive the control information of the master strobe MS to receive the flash mode, Control the amount of light emission. Hereinafter, such a mode is referred to as a control-only mode.
[0130]
Slave strobes SSA and SSB are slave strobes set in group A and group B, respectively.
[0131]
In both examples shown in FIGS. 9 and 10, the master strobe MS can directly set the light emission amounts of the group A strobe and the group B strobe by transmitting optical information.
[0132]
This wireless system based on optical information is the same as that proposed by the present applicant in Japanese Patent Laid-Open No. 2000-89306.
[0133]
Specifically, in a strobe shooting system including a camera body 1 having a master strobe MS and slave strobes SSA and SSB arranged at positions away from the camera body 1, the camera body 1 is controlled according to a control shutter speed. The flash light emission mode and the flat light emission mode are selected, and the strobe control information including the light emission mode is transmitted to the slave strobes SSA and SSB by optical communication by light emission of the master strobe MS. On the other hand, the slave strobes SSA and SSB flash in the flash emission mode or the flat emission mode in accordance with the received flash control information.
[0134]
As a result, the camera body 1 (master strobe MS) can instruct the strobe control information including information for selecting flash light emission and flat light emission to the slave strobe lights SSA and SSB wirelessly according to the shutter synchronization speed. The strobes SSA and SSB can emit light by selecting flash light emission and flat light emission in accordance with strobe control information from the camera body 1. Therefore, even in the wireless mode, it is possible to realize a flash photographing system in which the flash is synchronized with all shutter speeds.
[0135]
The hardware configurations of the strobes MS, SSA, and SSB are the same as those in the first embodiment, and a description thereof will be omitted.
[0136]
Next, operations of the camera microcomputer 100 and the strobe microcomputer 238 will be described. FIG. 11 is a flowchart showing the operation of the camera microcomputer 100 and the flash microcomputer 238. FIG. 12 is a timing chart when flashing is performed when the shutter speed of the camera is equal to or less than the synchronization time. FIG. It is a timing chart at the time of performing FP light emission when a shutter speed is faster than the synchronization time.
[0137]
12 and 13, A) to C) are signals for serial communication between the camera body and the strobe. A) is a synchronous clock signal for serial communication from the camera body 1 to the strobe, B) is a data output signal from the camera body 1 to the strobe, and C) is a data output signal from the strobe to the camera body 1. .
[0138]
D) shows the operation of the main mirror 2, E) shows the operation of the shutter front curtain, F) shows the operation of the shutter rear curtain, G) shows the conduction of the X contact of the camera, and the Lo level is Indicates the conduction state.
[0139]
H) and I) are wireless optical communication signals to the slave strobe generated by the master strobe MS causing the Xe tube 19 to intermittently emit light, and H) does not cause the master strobe MS to emit light that contributes to shooting. The light emission of the Xe tube 19 in the control-only mode in which light is emitted only for controlling the operation of the slave strobe is shown. I) shows light emission of the Xe tube 19 in the master light emission mode in which the master strobe MS also emits light that contributes to photographing.
[0140]
J) shows the light emission of the slave strobe SSA set to group A as shown in FIG. 10, and K) shows the light emission of the slave strobe SSB set to group B.
[0141]
In FIG. 11, when the power switch 242 of the master strobe MS is turned on, the strobe microcomputer 238 starts its operation. When the setting switch 208 is operated, the master flash MS is set to the manual light emission mode. Further, the amount of manual light emission is set by operating the up switch 250 or the down switch 251. The setting state of the strobe is displayed on the display 240 on the back of the strobe. Further, the light emission amounts of the slave strobe SSA and the slave strobe SSB can be set on the master strobe MS side, and each set light emission amount is displayed on the display 240.
[0142]
14A is a display example of the liquid crystal display 240 of the master strobe MS, and FIG. 14B is a display example of the liquid crystal display 240 of the slave strobe SS (A, B). In addition, the same code | symbol is attached | subjected to the same display member as FIG.
[0143]
In FIG. 14A, 303 is the manual light emission amount of the group A strobe. In the system of FIG. 9, the light emission amount of the master strobe MS directly connected to the camera body 1, and in the system of FIG. 10, the light emission amount of the group A slave strobe SSA.
[0144]
Reference numeral 310 denotes a manual light emission amount of the group B strobe. In this example, the manual light emission amount of the slave strobe SSB is shown.
[0145]
311 is an icon indicating a wireless state. In the master mode in which the strobe is on the master side and controls other strobes, the transmission state is visually indicated by showing an outward arrow with respect to the strobe. Indicates.
[0146]
Reference numeral 312 denotes a channel number display member for preventing interference, and reference numeral 313 denotes a display member indicating that the master strobe MS is in the ratio mode (multiple light quantity ratio setting mode). Reference numeral 314 denotes a display member that indicates that the light quantity ratio is A: B, that is, a mode in which two groups A and B are controlled.
[0147]
On the other hand, in FIG. 14B, when the slave strobe is in the slave mode controlled by the control signal from the master strobe MS, the icon 311 indicating the wireless state indicates an inward arrow with respect to the strobe. Indicates that it is in a receiving state. An icon 315 indicates that the strobe is set to the slave mode, and indicates that the strobe is set to the group B of the slave mode together with the display member 314.
[0148]
In the strobe, the master mode and the slave mode can be arbitrarily set by switching the switch 241 on the back of the strobe.
[0149]
[# 200]
When the switch SWFELK of the camera body 1 shown in FIG. 2 is turned on, the camera microcomputer 100 first measures the luminance BVa of the subject with the photometric sensor 7.
[0150]
[# 201]
The camera microcomputer 100 determines an exposure value (BVs) by a known algorithm based on the measured subject luminance value BVa. Then, the shutter speed value (TV) and aperture value (AV) are determined in accordance with the set shooting mode of the camera.
[0151]
[# 202]
Next, the camera microcomputer 100 instructs the strobe (master strobe MS) to perform preliminary light emission of the group A strobe by serial communication through the communication terminals S0, S1, and S2 (time t0 in FIGS. 12 and 13).
[0152]
The strobe microcomputer 238 of the master strobe MS receives this preliminary emission command and performs the preliminary emission operation of the group A strobe. That is, the Xe tube 19 is caused to emit light in a pulse manner at time t1 and t2, and information for the slave strobe to perform preliminary light emission is transmitted as an optical pulse to the slave strobe (FIGS. 12 and 13 (1) and ( 2)). Since this applicant has proposed this communication in Japanese Patent Application Laid-Open No. 2000-89306, detailed description thereof will be omitted.
[0153]
If there is an external slave strobe SSA, the slave strobe SSA receives this 2-byte light pulse and decodes the light emission amount and the light emission time for performing preliminary light emission.
[0154]
Next, at time t4, the group A strobe performs preliminary light emission. In this case, when the master flash MS is set to the master flash mode, the master flash MS also performs preliminary flash ((4) in FIGS. 12 and 13), and the master flash MS is set to the control-only mode. Emits a light pulse for the slave strobe SSA to start preliminary light emission ((3) in FIGS. 12 and 13).
[0155]
On the other hand, the slave strobe detects the start of this light pulse (3) or the FP preliminary light emission (4) of the master strobe, and starts the preliminary light emission itself ((5) in FIGS. 12 and 13).
[0156]
[# 203]
Reflected light from the subject due to preliminary light emission of the group A strobe is received by the photometric sensor 7 of the camera body 1 through the photographing lens 11. The camera microcomputer 100 reads the light receiving current of the photometric sensor 7 through the photometric circuit 108 and measures the subject brightness BVf by the strobe reflected light.
[0157]
[# 204]
The camera microcomputer 100 uses the following equation (4) to subtract the subject brightness BVa by natural light obtained in # 200 from the subject brightness BVf at the time of preliminary light emission, so that the brightness value of only the reflected light of the preliminary light emission by the group A strobe light is obtained. Extract dFA.
[0158]
dFA = LN2 (2 ^ BVf-2 ^ BVa) (4)
[# 205]
Next, using the following equation (5), the relative ratio γA of the main light emission of the group A that is appropriate for the preliminary light emission is obtained from the luminance value dFA of only the reflected light of the preliminary light emission.
[0159]
γA = LN2 (2 ^ BVs-2 ^ BVa) -dFA (5)
[# 206]
Next, the camera microcomputer 100 instructs the strobe to perform preliminary light emission of the group B strobe (time t6 in FIGS. 12 and 13).
[0160]
The strobe microcomputer 238 of the master strobe receives the preliminary emission command and performs the preliminary emission operation of the group B strobe. That is, at time t7 and t8, the Xe tube 19 is caused to emit light in pulses, and information for the slave strobe to perform preliminary light emission is transmitted to the slave strobe as light pulses ((6) and (7 in FIGS. 12 and 13). )).
[0161]
The slave strobe SSB receives the 2-byte light pulse and decodes the light emission amount and the light emission time for performing preliminary light emission.
[0162]
Next, at time t10, the master strobe MS emits a light pulse for the slave strobe SSB to start preliminary light emission ((8) and (9) in FIGS. 12 and 13).
[0163]
On the other hand, the slave strobe SSB detects the light pulse and starts preliminary light emission itself ((10) in FIGS. 12 and 13).
[0164]
[# 207]
The reflected light from the subject due to the emission of the group B strobe light is received by the photometric sensor 7 of the camera body 1 through the photographing lens 11. The camera microcomputer 100 reads the light receiving current of the photometric sensor through the photometric circuit 108 and measures the subject brightness EVfB by the strobe reflected light.
[0165]
[# 208]
The camera microcomputer 100 extracts the luminance value dFB only for the reflected light of the preliminary light emission by the group B strobe, similarly to # 204.
[0166]
dFB = LN2 (2 ^ BVf-2 ^ BVa) (6)
[# 209]
Next, in the same manner as in # 204, the relative ratio γBr of the group B main light emission appropriate for the preliminary light emission is obtained.
[0167]
γB = LN2 (2 ^ BVs-2 ^ BVa) −dFB (7)
[# 210]
Next, the camera microcomputer 100 obtains the Apex value GVA of the manual flash amount of the group A strobe and the Apex value GVB of the manual flash amount of the group B strobe. The GVA and GVB are obtained as follows.
[0168]
For example, if the set group A strobe light emission is 1/64 of full light emission,
GVA = LN2 (1/64) = − 6
Similarly, if the set group B strobe light emission is 1/128 of full light emission,
GVB = LN2 (1/128) = − 7
Therefore, when the light emission amounts PVA and PVB of the preliminary light emission of group A and group B are each 1/32 of the full light emission, the light amount differences DVA and DVB from the set manual light emission amount are
DVA = GVA-PVA (8)
DVB = GVB-PVB (9)
(However, PVA is the Apex value of the preliminary flash amount of the Group A strobe, PVB is the apex value of the preliminary flash amount of the Group B strobe, GVA is the apex value of the manual flash amount of the Group A strobe, and GVB is the group B strobe This is the apex value of manual flash output.
[0169]
[# 211]
Next, the difference between γA and γB in the above-mentioned formulas (5) and (7) and the DVA and DVB obtained in the formulas (8) and (9) is expressed by Use to calculate.
[0170]
DifA = γA−DVA (10)
DifB = γB−DVB (11)
Then, the difference DifAB from the synthesized final appropriate light amount is obtained by the following equation by the equations (10) and (11).
[0171]
DifAB = LN2 (2 ^ DifA + 2 ^ DifB)
That is, DifAB is the difference between the added light amount of the group A strobe and the group B strobe and the appropriate light amount.
[0172]
[# 212]
The difference DifAB from the appropriate light amount obtained in # 211 is displayed on the in-finder display 24 of the camera body 1. FIG. 15 shows an example of this display.
[0173]
That is, the display next to the viewfinder displays the difference in the current shooting conditions (aperture, sensitivity, strobe emission amount, etc.) with respect to the appropriate amount of light indicated by the scale at the center in the vertical direction, that is, whether the exposure amount is excessive or insufficient.
[0174]
In FIG. 15, only the exposure amount added for group A and group B is displayed, but in FIG. 16, the difference with respect to the appropriate amount of light for each of group A and group B and the appropriate amount of light for which group A and group B are added. The difference is displayed.
[0175]
Further, these displays may be displayed on the liquid crystal on the back surface of the master strobe MS, as in the first embodiment.
[0176]
[# 213]
When SW2 (release SW) is turned on, the process proceeds to # 214, and when it is off, the process returns to # 210.
[0177]
In other words, once the preliminary flash is performed, the current setting displayed in the viewfinder or on the back of the flash is changed by the photographer changing the aperture or changing the manual flash output unless the subject distance is changed. Since the difference between the exposure amount and the appropriate light amount is updated, the photographer can set an appropriate strobe light amount or aperture value while viewing this display.
[0178]
Regarding the determination of the exposure by the preliminary light emission, when photographing a reflective object such as a watch or a jewel as described with reference to FIG. 17, the exposure is not determined by the subject itself, but a standard reflection with a reflectance of 18% in advance. More stable exposure can be obtained by photometry using a plate.
[0179]
[# 214]
When SW2 is pressed, the camera microcomputer 100 starts a release sequence. If the shutter speed is equal to or lower than the synchronization speed, the process proceeds to # 215. If the shutter speed is higher than the synchronization speed, the process proceeds to # 216.
[0180]
[# 215]
When the shutter speed is equal to or lower than the synchronization speed, the camera transmits a flash emission mode to the strobe.
[0181]
[# 216]
When the shutter speed is faster than the synchronization speed, the camera transmits the FP emission mode and the FP emission time to the strobe. This FP emission time is the shutter speed plus the curtain speed.
[0182]
[# 217]
The master strobe MS transmits to the slave strobe a light emission mode (flash light emission mode, FP light emission mode), a light emission amount of each group, and a light emission time in the case of FP light emission (FIGS. 12 and 13). 11), (12), (13)).
[0183]
[# 218]
The main mirror 2 is flipped up and retracted from the photographing optical path, and at the same time, the photographing lens 11 is instructed to narrow down the diaphragm 36 (time t13 in FIGS. 12 and 13).
[0184]
[# 219]
Wait until the main mirror 2 is completely retracted from the optical path.
[0185]
[# 220]
When the main mirror 2 fully jumps up, the camera microcomputer 100 energizes the front curtain drive magnet MG-1 to start opening the focal plane shutter 8 (time t17 in FIGS. 12 and 13).
[0186]
[# 221]
If the light emission mode is the FP light emission mode, the process proceeds to # 223, and if the light emission mode is the flash light emission mode, the process proceeds to # 222.
[0187]
[# 222]
In the flash light emission mode, the camera waits until the front curtain is completely opened in the camera body 1 and the X contact is turned on, and when it is turned on, the process proceeds to # 117 to start flash light emission.
[0188]
[# 223]
The camera microcomputer 100 performs the main light emission control according to the light emission mode (time t18 in FIG. 12 in the flash light emission mode and time t17 in FIG. 13 in the FP light emission mode).
[0189]
On the other hand, the strobe microcomputers 238 of the slave strobes SSA and SSB start slave light emission in accordance with the light emission mode, light emission time, and light emission amount received in # 217 of the optical signal transmitted from the master strobe MS.
[0190]
Note that the main light emission process in the flash light emission mode and the FP light emission mode is the same as that described in the first embodiment, and thus description thereof is omitted.
[0191]
[# 224]
When a predetermined shutter opening time elapses, the camera microcomputer 100 energizes the rear curtain energizing magnet MG-2, closes the rear curtain of the shutter, and ends the exposure (in the flash emission mode, at time t19, FP in FIG. 12). In the case of the light emission mode, time t19 in FIG.
[0192]
[# 225]
When a series of shooting sequences is completed, the camera microcomputer 100 lowers the main mirror 2 and ends shooting.
[0193]
As described above, according to the present embodiment, in a flash photographing system having a plurality of manual flash capable flashes, the plurality of strobes are sequentially pre-flashed and set as a photometric result at the time of each pre-flash. It is possible to calculate the appropriate exposure amount for manual flash shooting based on the shooting conditions and to check whether the exposure amount is excessive or insufficient when shooting with the flash exposure manually set for the appropriate exposure amount before shooting. Therefore, even when using a plurality of strobes whose light emission amounts are set independently, manual strobe shooting with an appropriate light emission amount is possible without using a strobe meter.
[0194]
In this embodiment, the case where the light emission amount is controlled independently for each of the two groups of group A and group B has been described. However, even when there are two or more groups, preliminary light emission is performed sequentially in time series. Measure the reflected light, calculate the amount of overexposure and underexposure in each group from the light emission amount set independently, and add each excess and deficiency amount as shown by # 211 to obtain the total exposure The amount of excess or deficiency can be obtained.
[0195]
In the present embodiment, the master strobe MS mounted on the camera body 1 controls the operation of the slave strobe by causing the Xe tube to emit a small amount of light. However, this embodiment has a similar transmission function using radio waves, infrared rays, or the like. A controller (included in the photographing apparatus) may control the operation of the slave strobe.
[0196]
Furthermore, in the first and second embodiments described above, the case where the difference between the appropriate exposure amount and the exposure amount when shooting is performed under the currently set shooting conditions has been described, but the appropriate exposure amount is obtained. For this reason, the difference between the appropriate flash emission amount (target emission amount) and the currently set flash emission amount may be displayed.
[0198]
【The invention's effect】
  This applicationFirst1And second2According to the invention, the target photographing light amount (for example, appropriate exposure) calculated based on the photometric result of preliminary light emission of a plurality of illumination means such as a strobe and various photographing conditions set such as aperture, shutter speed, and light sensitivity. Amount) or target light emission amount, and the difference between the set photographing light amount or the set main light emission amount when shooting is performed with the sum of light emission amounts (main light emission amounts) of the respective illumination means manually set by the photographer In the viewfinder field, etc., prompting the photographer to change the setting of the flash output and shooting conditions set manually, so that appropriate exposure can be easily performed without using a strobe meter during manual flash photography. Obtainable.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a flash photographing system according to a first embodiment of the present invention.
FIG. 2 is an electric circuit block diagram of the flash photographing system according to the first embodiment.
FIG. 3 is an electric circuit block diagram of a strobe constituting the strobe photographing system of the first embodiment.
FIG. 4 is an external view of the strobe of the first embodiment.
FIG. 5 is a flowchart showing the operation of the camera body constituting the strobe photographing system of the first embodiment.
FIG. 6 is a view showing a display example of a display example of a rear display in the strobe of the first embodiment.
FIG. 7 is a view showing a display example of a display in a viewfinder in the camera of the first embodiment.
FIG. 8 is a view showing a display example of a display example of an external display in the camera of the first embodiment.
FIG. 9 is a diagram showing a configuration of a flash photographing system according to a second embodiment of the present invention.
FIG. 10 is a diagram showing another configuration of the flash photographing system according to the second embodiment.
FIG. 11 is a flowchart showing the operation of the camera of the second embodiment.
FIG. 12 is a timing chart showing the operation of the camera of the second embodiment.
FIG. 13 is a timing chart showing the operation of the camera of the second embodiment.
FIG. 14 is a view showing a display example of a rear display of the strobe constituting the strobe photographing system of the second embodiment.
FIG. 15 is a view showing a display example of a display in a viewfinder of a camera body constituting the strobe photographing system of the second embodiment.
FIG. 16 is a view showing a display example of a display in a finder of the camera body constituting the strobe photographing system of the second embodiment.
FIG. 17 is a diagram illustrating an example of shooting a general strobe.
[Explanation of symbols]
19 Xenon tube
24 Display in the viewfinder
42 Display for monitor
100 camera microcomputer
112 Lens microcomputer
236 Strobe microcomputer
240 Strobe rear display
257 Wireless receiver circuit
248 Flash mode setting SW
250 Parameter up switch
251 Parameter down switch

Claims (5)

A photographing device that emits light from a plurality of illumination means including a light emission amount setting means that enables selective setting of a light emission amount during photographing,
Photometric means for measuring the object illuminated by each of the illumination means;
Prior to main light emission, the plurality of illumination means are selectively set sequentially to cause preliminary light emission at a predetermined light emission amount, and based on the photometric results obtained by the photometry means at the time of preliminary light emission and the set photographing conditions The target photographing light quantity at the time of photographing by the main light emission using the plurality of illumination means is calculated, and the calculated target photographing light quantity and the sum of the light emission quantities respectively set by the light emission quantity setting means in each illumination means Calculating means for calculating the difference from the set shooting light quantity when shooting with the main flash amount as
Photographing apparatus characterized by having a display means for displaying the difference between the set imaging light amount and computed the target imaging light amount by the arithmetic means. 2. The photographing apparatus according to claim 1, wherein the display unit displays a difference between a photographing light amount accompanying the main light emission of each of the lighting units and the target photographing light amount. A photographing device that emits light from a plurality of illumination means including a light emission amount setting means that enables selective setting of a light emission amount during photographing,
Photometric means for measuring the object illuminated by each of the illumination means;
Prior to main light emission, the plurality of illumination means are selectively set sequentially to cause preliminary light emission at a predetermined light emission amount, and based on the photometric results obtained by the photometry means at the time of preliminary light emission and the set photographing conditions , as well as calculating a target light emission amount of the light emission time of using the plurality of illumination means, the light emission amount at the time of the emission of more set each illumination means to the calculated target light emission amount and the light emission amount setting means Computing means for computing the difference from the sum of
Photographing apparatus characterized by having a display means for displaying the difference between the sum of the light emission amount of the light emission time of the set and the target light emission amount calculated by said calculating means. The photographing apparatus according to claim 3, wherein the display unit displays a difference between a light emission amount during main light emission set in each of the illumination units and the target light emission amount. 5. An imaging system comprising: the imaging apparatus according to claim 1; and a plurality of illumination units attached to the imaging apparatus.

Images