JPH11282063A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera capable of continuously executing flash bracketing photographing by the recovery of a charging voltage since then, without finishing flash bracketing in the process, even if the charging voltage of a flash is lower than a flashing possible voltage, etc. SOLUTION: In the camera capable of setting a flash bracketing photographing mode in which FE locking for setting an emitted light quantity for photographing by the previous light emission of the flash, before photographing is attained and the emitted light quantity of the flash is increased/decreased by an arbitrary quantity with respect to a prescribed value, whenever flash photographing is executed, a control means for holding (return) information on the FE locking (information on a main emitted light quantity, etc.), even if the flash charging voltage is lower than the flashing possible voltage (105), in the case the FE locking is attained in the flash bracketing photographing mode (steps 101 and 109) is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a so-called flash bracketing function and an FE lock function.

[0002]

2. Description of the Related Art The flash bracketing function is a function capable of increasing or decreasing an amount of light emission of a flash from a predetermined value (appropriate value) for each flash photographing.
The FE lock function is a function for determining a basic light emission amount (main light emission amount) of the flash at the time of shooting by pre-emission of the flash before the shooting sequence. Conventionally, these functions have been used as independent functions.

In the conventional FE lock function, if the charging voltage of the flash becomes lower than the voltage at which light emission is possible, flash photography cannot be performed. Therefore, FE lock information is cleared to release the FE lock.

[0004]

However, when the FE lock function and the flash bracketing function are used in combination, the FE lock information is cleared when the flash charging voltage becomes lower than the light emission enabling voltage as in the related art. If this happens, flash bracketing under the FE lock may end on the way.

Also, during flash bracketing, F
If the update of the E-lock is accepted and the flash bracketing is continued, the continuity of the flash exposure amount in one sequence of the flash bracketing is lost.

Therefore, according to the present invention, when the FE lock is performed in the flash bracketing photographing mode, the flash bracketing is terminated halfway even when the charging voltage of the flash is lower than the light emitting voltage such as the light emitting voltage. It is another object of the present invention to provide a camera capable of continuously performing flash bracketing photographing by restoring the charging voltage thereafter.

Another object of the present invention is to provide a camera capable of maintaining the continuity of the flash exposure amount during one flash bracketing sequence.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, an FE lock for setting a light emission amount at the time of photographing by pre-emission of a flash can be performed before photographing, and the FE lock can be performed for each photographing of the flash. When the FE lock is performed in the flash bracketing shooting mode in a camera capable of setting the flash bracketing shooting mode in which the flash emission amount is increased or decreased by an arbitrary amount with respect to a predetermined value (particularly, at least one scene flash). After the photographing is performed), a control unit is provided for holding information on the FE lock (information on the main light emission amount and the like) even if the flash charging voltage is lower than the flashable voltage.

With this, even if the flash charging voltage becomes lower than the flashable voltage during flash bracketing shooting, the FE lock information is stored without being cleared, so that the flash bracketing is performed due to the lower flash charging voltage. It is possible to prevent the FE lock of the tent from being terminated halfway. And
After that, when the flash charging voltage recovers to the light emission enabling voltage, it becomes possible to continue the flash bracketing shooting under the same FE lock state as the flash shooting of the previous scene.

When FE lock is performed in the flash bracketing shooting mode (especially after flash shooting of at least one scene is performed), information on FE lock and non-flash shooting are performed. It is desirable to clear the information on flash bracketing to prevent the flash bracketing from being continued in a state where non-flash shooting is mixed, thereby preventing the continuity of flash bracketing shooting from being maintained.

Further, in the second invention of the present application, the FE for setting the light emission amount at the time of photographing by pre-emission of a flash before photographing.
In a camera capable of setting a flash bracketing shooting mode in which a lock can be performed and a flash emission amount can be increased or decreased by an arbitrary amount with respect to a predetermined value for each flash shooting, the FE can be set in the flash bracketing shooting mode.
Control means is provided for inhibiting updating of the FE lock when locking is performed and at least one scene of flash photography is performed.

Thus, it is possible to prevent the FE lock information from changing during one sequence of flash bracketing photography, thereby preventing continuity of the exposure amount in flash bracketing photography from being maintained.

[0013]

(First Embodiment) FIG. 1 shows an electric configuration of a single-lens reflex camera having a flash bracketing function and an FE lock function according to a first embodiment of the present invention. . In this figure, 100
Denotes a central processing unit (hereinafter, referred to as MPU) of a microcomputer which is a control means built in the camera body. The operating frequency of the MPU 100 is
By the signal in MPU100, the source oscillation circuit made by
It is determined by not dividing, dividing by 1/2, dividing by 1/16, and the like. 100b is EEPR as storage means
OM, which can store a film counter, FE lock information, flash bracketing information, and other shooting information. An A / D converter 100c A / D converts an analog signal input from the focus detection circuit 103 and the multi-segment photometry sensor 104 as described later.

The MPU 100 includes a liquid crystal display circuit 102,
A focus detection circuit 103, a photometry circuit 104, a shutter control circuit 105, a motor control circuit 106, a film running detection circuit 107, and a switch sense circuit 108 are connected. In addition, a lens control circuit 39 disposed in the taking lens 1 is connected so as to be able to transmit a signal via a mount contact 37 shown in FIG. Further, it is connected to the external flash circuit 110 via an external flash contact 111 so that information can be transmitted.

The liquid crystal drive circuit 102 is a liquid crystal panel for displaying a focus detection area in the finder visual field.
CD15 and LCD20 in viewfinder outside viewfinder
Is controlled in accordance with a signal from the MPU 100.

The focus detection circuit 103 performs accumulation control and readout control of the focus detection area sensor 6f in accordance with a signal from the MPU 100, and stores each pixel information in the MPU 10
Output to 0. The MPU 100 performs A / D conversion of this information, performs focus detection by a well-known phase difference detection method, and sends out the detected focus detection information to the lens control circuit 39 to adjust the focus of the lens.

The photometry circuit 104 outputs an output from the photometry sensor 10 as a luminance signal of each area in the screen to the MPU 10.
Output to 0. The MPU 100 performs A / D conversion on the luminance signal and adjusts the exposure for shooting. The flash control according to the present embodiment employs a method in which a pre-emission is performed immediately before the flash emission at the time of shooting, and a flash emission amount at the time of shooting is determined. ing. In addition, there is also a function (FE lock function) of performing pre-flash before shooting (not performing pre-flash immediately before flash emission at the time of shooting) and determining the amount of flash emission before shooting at the photographer's will. I have. For this reason,
The camera of this embodiment is provided with an FE lock switch (not shown) for selectively performing FE lock.

The shutter control circuit 105 includes an MPU 10
In accordance with the signal from 0, the first shutter is driven by energizing the magnet MG-1 and the second shutter is driven by energizing the magnet MG-2 to perform exposure control. The motor control circuit 106
By controlling the motor M in accordance with a signal from the MPU 100, up / down of the main mirror 2, charging of the shutter, and feeding control of the film are performed.

A film running detection circuit 107 detects whether the film has been wound up by one frame during film feeding.
A signal is sent to the MPU 100.

SW1 is turned on by the first stroke operation (half-press operation) of a release button (not shown), and the photometry, A
F, a switch for starting operation. SW2 is a switch that is turned on by the second stroke operation (full press operation) of the release button to start the exposure operation.

A continuous shooting mode (continuous shooting mode) switch is a switch for setting a mode of a shooting sequence. When the continuous shooting mode switch is ON, a continuous shooting mode is set. When the continuous shooting mode SW is OFF, a single shooting mode (single shooting mode) is set. You. Other signals indicating the states of the operation members of the camera (not shown) are detected by the switch sense circuit 108 and sent to the MPU 100.

The external flash circuit 110 has a flash bracketing mode SW for setting a flash bracketing photographing mode, and a signal of this switch is sent to the MPU 100 by communication.

FIG. 2 shows the optical arrangement of the single-lens reflex camera. The same components as those in FIG. 1 are denoted by the same reference numerals. In this figure, reference numeral 1 denotes a photographing lens. In this drawing, two lenses 1a and 1b are shown for convenience, but actually, it is composed of many lenses.

Reference numeral 2 denotes a main mirror which is inclined or moved away from the photographing optical path according to the observation state and the photographing state. Reference numeral 3 denotes a sub-mirror, which reflects a light beam transmitted through the main mirror 2 obliquely provided with respect to the photographing optical path toward the lower side of the camera body. Reference numeral 4 denotes a shutter. Reference numeral 5 denotes a photosensitive member, which is composed of a silver halide film, a CCD, a solid-state imaging device such as a MOS type, or an imaging tube such as a vidicon.

Reference numeral 6 denotes a focus detection device, which includes a field lens 6a and reflection mirrors 6b and 6 arranged near the image plane.
c, a secondary imaging lens 6d, an aperture 6e, an area sensor 6f including a plurality of CCDs and the like, and focus detection by a well-known phase difference method.

Reference numeral 7 denotes a focusing plate arranged on a predetermined image forming plane of the taking lens 1, and 8 denotes a pentaprism for changing a finder optical path. Reference numerals 9 and 10 denote an imaging lens and a photometric sensor for measuring the luminance of the subject in the observation screen. Imaging lens 9
Is a focusing plate 7 via a reflection optical path in a pentaprism 8.
And the photometric sensor 10 are conjugated.

Light from the subject (finder lights X1 and X2) taken into the taking lens 1 forms an image on a focus plate 7 via a main mirror 2 and an image on the focus plate 7 passes through a pentaprism 8. To the eyepiece 11 (X1) and the imaging lens 9 (X2). At the same time, display light X
3 is combined with the finder light X1 by the half mirror 12, and these combined images reach the pupil 18 of the observer via the eyepiece 11 and are observed.

Here, the display light X3 will be described.
First, the light emitted from the backlight LED 17 enters the Fresnel lens 16 and is condensed by the Fresnel lens 16 to form a focus detection area display liquid crystal panel 15 in which display segments corresponding to a plurality of focus detection areas are formed. Incident on. The luminous flux transmitted through the focus detection area display liquid crystal panel 15 is reflected by the mirror 14, condensed by the projection lens 13, combined with the finder light X 1 by the half mirror 12, and guided to the eyepiece 11.

Reference numeral 21 denotes a finder field mask. Reference numeral 20 denotes an LCD in the finder for displaying photographing information outside the finder field of view.
-LED). LC in viewfinder
The light that has passed through D20 is guided into the viewfinder by the triangular prism 22, and allows the observer to observe the photographing information.

Reference numeral 31 denotes an aperture provided in the taking lens 1;
Denotes an aperture driving circuit, 33 denotes a lens driving motor, and 34 denotes a lens driving member including a driving gear and the like. Reference numeral 35 denotes a photocoupler, which detects the rotation of the pulse plate 36 interlocked with the lens driving member 34 and transmits the rotation to the lens focus adjustment circuit 38. Reference numeral 38 denotes a lens focus adjustment circuit,
The lens driving motor 33 is driven by a predetermined amount based on the information from the lens control circuit 5 and the information on the lens driving amount from the lens control circuit 39, and the focusing lens 1a of the photographing lens 1 is moved to the focusing position. The lens control circuit 39 controls the lens focus adjustment circuit 38 and the aperture drive circuit 32 based on information from the camera.

Next, the operation of the single-lens reflex camera of this embodiment will be described with reference to the flowcharts shown in FIGS. This camera operation corresponds to the first to third and ninth aspects of the present invention.

In FIG. 3, when the operation of the camera is started, the MPU 100 firstly starts the MP
Initialize the inside of U. Next, in step # 002,
Photographing data such as FE lock information and flash bracketing information is stored in an EEPROM in the MPU 100.
Read from

Next, in step # 003, communication with the switch sense circuit 108 is performed to detect the switch state.

Further, in step # 004, it is determined whether or not the external flash is mounted. If the external flash is mounted, the process proceeds to step # 005, and if not, the process proceeds to step # 014.

In step # 005, communication with the external flash is performed to obtain external flash information such as a flash bracketing mode and a charging voltage state.

In step # 006, a flash-related charge completion check and a flag process are performed based on the external flash information. Here, this processing will be described in detail with reference to the flowchart of FIG.

In step # 101 of FIG. 4, it is determined whether or not the flash bracketing photographing mode is set. If the mode is set, the process proceeds to step # 103. On the other hand, when the flash bracketing shooting mode is not set, in step # 102, FEB_COUNT, which is a flag indicating the number of shooting scenes in flash bracketing, and whether the FE lock has been performed in the flash bracketing shooting mode. FELK_FEB which is a flag (however, it is not recognized that the FE is locked by this flag) is cleared, and step #
Move to 105. After this step, FE
When B_COUNT = 0, it can be determined that the flash bracketing shooting mode is not set.

In step # 103, FEB_COUN
It is determined whether or not T is not 0, and if it is not 0, the process proceeds to step # 105. On the other hand, when FEB_COUNT is 0, in step # 104, FEB_COUNT is set to 1
Set to. As a result, the process proceeds to step # 105 as the first scene of the flash bracketing shooting.

At step # 105, it is determined whether or not the charging voltage of the flash is lower than the voltage at which light emission is possible (whether or not charging has not been completed). If it has been completed, the process proceeds to step # 106.

In step # 106, FELK_FEB
Is determined to be 1 or not, and when it is 1 (when the FE lock is performed in the flash bracketing shooting mode), the process proceeds to step # 107, and when it is not 1, the process returns.

In step # 107, the flag FELK_FLG indicating whether or not the FE is locked is set to 1, and the FE is locked. Then, the process proceeds to step # 109.

In step # 108, FELK_
FLG is set to 0 to release the FE lock.

In step # 109, FELK_FEB
Is determined to be 1 or not, and when it is not 1, Δf (pre-light amount hitting a subject) which is FE lock information and pre_lev
el (pre-light emission amount) and return.

On the other hand, when FELK_FEB is 1, the routine returns. That is, when the FE lock is performed in the flash bracketing shooting mode,
Even if the flash charging voltage is lower than the light emission enabling voltage and the FE lock is released, the FE used for the light emission calculation at the time of the FE lock.
The lock information Δf and pre_level are held without being cleared.

If the flash charging voltage becomes equal to or higher than the light emission enabling voltage in the next flow, the FE lock state (FELK_FLG = 1) is returned again in step # 107, and the light emission amount is calculated (step # in FIG. 5). 204)
Will be used.

Returning to FIG. 3, in step # 007, it is determined whether or not charging has been completed. If charging has not been completed, control proceeds to step # 015, and if charging has been completed, control proceeds to step # 008. .

In step # 008, it is determined whether or not the FE lock SW has been switched from off to on. If the FE lock SW has been switched, the process proceeds to step # 009. If not, the process proceeds to step # 015.

In step # 009, FEB_COUN
It is determined whether or not T is 0 or 1, and if it is 0 or 1, the process proceeds to step # 010 to perform pre-emission control using an external flash, that is, update of the FE lock.

On the other hand, if FEB_COUNT is not 0 or 1, the flow shifts to step # 015. That is, when at least one scene is shot in the flash bracketing shooting mode, the update of the FE lock is prohibited.

In step # 010, pre-emission control by an external flash is performed, and Δf is calculated from the output of the photometry circuit 104. Further, the pre-emission amount at this time is received by communication with the flash, and stored as pre_level.

Then, in step # 011, the FE
FELK_FLG = 1 to indicate that it is locked
And

Further, in step # 012, the FE
It is determined whether B_COUNT is 1 or not. If it is 1, FELK_FEB = 1 is set in step # 013, and the process proceeds to step # 016. On the other hand, FEB_COUNT = 1
If not (when 0), the process proceeds to step # 016
Move to.

In step # 014, since no external flash is mounted, the flash-related information is cleared, and the flow proceeds to step # 015.

In step # 015, it is determined whether or not the switch SW1 is off. If the switch SW1 is off, the process proceeds to step # 023, where the photographing information is written in the EEPROM, and the program ends. If SW1 is on, step # 016
Then, the shooting preparation operation starts.

In step # 016, the shutter speed and the aperture value of the lens are calculated based on the luminance information of the subject from the photometry circuit 104, and the exposure amount is determined.

Next, in step # 017, a focus detection operation is performed. This is because the focus detection circuit 10
3 is based on the phase difference detection method.

Next, at step # 018, MPU1
00 controls the lens control circuit 39 in accordance with the focus detection state obtained by the focus detection operation in step # 017 to adjust the focus of the lens. Then, in the next step # 019, the shutter speed and the aperture value obtained in step # 016 and the value of step # 01
Communication with the liquid crystal display circuit 102 is performed to display the focus detection result obtained in step 7 in the viewfinder.

In the following step # 020, the state of the switch SW2 is checked.
Move to. If the switch SW2 is ON, the process proceeds to step # 021, where release control for exposing the film is performed.

Here, the release control will be described with reference to the flowchart shown in FIG. Step # 20 in FIG.
In step 1, it is determined whether or not to perform flash photography. In this embodiment, when an external flash is attached and flash charging is completed, flash photography is performed. Step # when performing flash photography
The process proceeds to step 202, and if the flash photography is not performed, the process proceeds to step # 205.

In step # 202, FELK_FLG
It is determined whether or not = 0, and if it is 0, the process proceeds to step # 203. If it is not 0 (when it is 1), the process proceeds to step # 204.

In step # 203, as in the pre-emission control at the time of FE lock, the pre-emission control by the external flash is performed, and ΔF is calculated from the output of the photometry circuit 104. Further, the pre-emission amount at this time is received by communication with the flash, and stored as PRE_LEVEL.

In step # 204, the flash main light emission amount is calculated. Here, the light emission amount calculation will be described in detail with reference to the flowchart shown in FIG.

First, in step # 301, FEB_C
It is determined whether or not OUNT is 0 or 1, and if it is 0 or 1, the process proceeds to step # 302, and F_COMP (light control correction amount)
= 2 ⁰ and if not 0 or 1, step # 303
Move to.

In step # 303, FEB_COUN
It is determined whether T is 2 or not, and when it is 2, the process proceeds to step # 304, where F_COMP = 2 ^−1. When T is larger than 2, the process proceeds to step # 305 and F_COMP = 2 ¹
And That is, no dimming correction is performed for the first scene in one sequence of the flash bracketing shooting mode or for the first scene in one sequence of the flash bracketing shooting mode. The light correction is multiplied by -1 step, and the dimming correction is multiplied by +1 step in the third and subsequent scenes in one sequence of the flash bracketing shooting mode.

Then, at step # 306, the FE
It is determined whether LK_FLG is 1 or not, and when it is 1, ΔF = Δf, PRE_LEVEL = pre in step # 307.
As _level, the data at the time of FE lock is input to the data area when the FE lock is not performed. On the other hand, FELK
If _FLG is not 1, the process proceeds to step # 308. By doing so, the operation is shared between when the FE is locked and when it is not.

In step # 308, the main light emission amount F_OUT of the flash is calculated, and the routine returns.

F_OUT = F_COMP × (PRE_L
EVEL × EVt ÷ ΔF) where F_COMP: dimming correction amount PRE_LEVEL: flash pre-flash amount EVt: target exposure amount ΔF: pre-flash amount hitting the subject Calculate with the spec value.

Returning to the flow of FIG. 5, in step # 205, the motor M is driven via the motor control circuit 106.
The main mirror 2 is raised.

Next, in step # 206, the aperture value is sent to the lens control circuit 39, and the lens is stopped down to the specified value.

Further, in step # 207, it is determined whether or not the flash photography is performed. If the flash photography is performed, communication with the external flash is performed in step # 208, and the flash light emission amount and the light emission start are transmitted. If it is not flash photography, the process proceeds to step # 209, where the shutter control circuit 105 runs the front curtain.

Then, in step # 210, it is determined whether or not the set exposure time has elapsed. If not, the process loops and waits until the set exposure time has elapsed.

If the set exposure time has elapsed, the flow advances to step # 211 to cause the shutter control circuit 105 to run the rear curtain.

Next, in step # 212, communication is performed with the lens control circuit 39 to open the aperture.

Next, in step # 213, the motor M is driven via the motor control circuit 106, and the main mirror 2 is driven.
Down.

Next, in step # 214, FEB
It is determined whether or not _COUNT is greater than 0, and if it is greater than 0, the process proceeds to step # 215; otherwise, the process proceeds to step # 218.

At step # 215, FEB_COUN
The calculation of T = FEB_COUNT + 1 is performed, and the shooting scene count of flash bracketing is increased by one.

Next, at step # 216, FEB_
It is determined whether or not COUNT is greater than 3, and if it is greater than 3, FEB_COUNT = 0 in step # 217.
Otherwise, the process proceeds to step # 218. That is, the value of FEB_COUNT is set to 0 to 3, and the flash bracketing takes three shots as one sequence.

When the exposure of one frame of the film is completed in this way, and it is determined in step # 218 that the film is loaded, the process proceeds to step # 219, where the film is fed by one frame, and the process returns. If no film is loaded, the routine returns.

When the release control is completed as described above, the flow returns to the flow of FIG. 3, and in step # 022,
It is determined whether the switch SW1 is on. If it is on, the process returns to step # 003, and if it is off, it returns to step # 02.
Proceeding to 3, the various photographing information such as flash bracketing information is stored in the EEPROM, and the program ends.

(Second Embodiment) Next, a camera charging completion check and flag processing according to a second embodiment of the present invention will be described with reference to the flowchart of FIG. The present embodiment corresponds to the invention described in claims 5 to 7, and the camera control other than the charge completion check and the flag processing is the same as the first embodiment.

At step # 101 in FIG. 7, it is determined whether or not the flash bracketing photographing mode is set. If the mode is set, the process proceeds to step # 103. On the other hand, when the flash bracketing shooting mode is not set, in step # 102, FEB_COUNT, which is a flag indicating the number of shooting scenes in flash bracketing, and whether the FE lock has been performed in the flash bracketing shooting mode. FELK_FEB which is a flag (however, it is not recognized that the FE is locked by this flag) is cleared, and step #
Move to 105. After this step, FE
When B_COUNT = 0, it can be determined that the flash bracketing shooting mode is not set.

At step # 103, FEB_COUN
It is determined whether or not T is not 0, and if it is not 0, the process proceeds to step # 105. On the other hand, when FEB_COUNT is 0, in step # 104, FEB_COUNT is set to 1
Set to. As a result, the process proceeds to step # 105 as the first scene of the flash bracketing shooting.

At step # 105, it is determined whether or not the charging voltage of the flash is lower than the voltage at which light emission is possible (whether or not charging has not been completed). If it has been completed, the process proceeds to step # 106.

In step # 106, FELK_FEB
Is determined to be 1 or not, and when it is 1 (when the FE lock is performed in the flash bracketing shooting mode), the process proceeds to step # 107, and when it is not 1, the process returns.

At step # 107, 1 is set to a flag FELK_FLG indicating whether or not the FE is locked, so that the FE is locked. Then, the process proceeds to step # 109.

In step # 108, FELK_
FLG is set to 0 to release the FE lock.

At step # 109, FELK_FEB
Is determined to be 1 or not, and when it is not 1, step # 111
Proceed to step # 110 if it is 1.

At step # 110, FEB_COUN
It is determined whether or not T is greater than 1. If it is 1, the process proceeds to step # 111.

In step # 111, FELK_FEB
And FE lock information Δf (pre-light amount hitting a subject) and pre_level (pre-light emission amount) are cleared, and the process returns.

On the other hand, in step # 110, FEB_CO
If UNT is greater than 1, the routine returns.
That is, in the flash bracketing shooting mode, F
When the E-lock is performed and at least one scene is photographed, the FE lock information Δf and pre_level used for the flash calculation at the time of the FE lock are cleared even if the flash charge voltage is lower than the flashable voltage and the FE lock is released. It is kept without being. Then, when the flash charging voltage becomes equal to or higher than the light emission enabling voltage in the next flow, the FE lock state (FELK_FLG =
0), and the FE lock information held in the subsequent light emission amount calculation (step # 204 in FIG. 5) is used.

(Third Embodiment) Next, a camera release control according to a third embodiment of the present invention will be described with reference to the flowchart of FIG. The present embodiment is described in claim 4
8 and the camera control other than the release control is the same as that of the first embodiment.

In step # 201 of FIG. 5, it is determined whether or not to perform flash photography. In this embodiment, when an external flash is attached and flash charging is completed, flash photography is performed. When the flash photography is performed, the process proceeds to step # 202. When the flash photography is not performed, the process proceeds to step # 205.

At step # 202, FELK_FLG
It is determined whether or not = 0, and if it is 0, the process proceeds to step # 203. If it is not 0 (when it is 1), the process proceeds to step # 204.

In step # 203, as in the pre-emission control at the time of FE lock, the pre-emission control by the external flash is performed, and ΔF is calculated from the output of the photometry circuit 104. Further, the pre-emission amount at this time is received by communication with the flash, and stored as PRE_LEVEL.

In step # 204, the flash main light emission amount is calculated as described with reference to FIG. 6 in the first embodiment.

Next, in step # 205, the motor M is driven via the motor control circuit 106, and the main mirror 2 is raised.

Next, in step # 206, the aperture value is sent to the lens control circuit 39, and the lens is narrowed down to the specified value.

Further, in step # 207, it is determined whether or not flash photography has been performed. If the flash photography has been performed, communication with an external flash is performed in step # 208, and the flash light emission amount and light emission start are transmitted. If it is not flash photography, the process proceeds to step # 209.

In step # 209, FE lock information and flash bracketing information are cleared for non-flash photography.

Next, in step # 210, the front curtain is driven by the shutter control circuit 105.

Then, in step # 211, it is determined whether or not the set exposure time has elapsed. If not, the process loops and waits until the set exposure time has elapsed.

If the set exposure time has elapsed, the flow advances to step # 212, where the shutter control circuit 105 runs the rear curtain.

Next, in step # 213, communication is performed with the lens control circuit 39 to open the aperture.

Next, in step # 214, the motor M is driven via the motor control circuit 106, and the
Down.

Next, in step # 215, FEB
It is determined whether or not _COUNT is greater than 0. If _COUNT is greater than 0, the process proceeds to step # 216; otherwise, the process proceeds to step # 219.

In step # 216, FEB_COUN
The calculation of T = FEB_COUNT + 1 is performed, and the shooting scene count of flash bracketing is increased by one.

Next, at step # 217, FEB_
It is determined whether or not COUNT is larger than 3, and if it is larger than 3, FEB_COUNT = 0 in step # 218.
Otherwise, the process proceeds to step # 219. That is, the value of FEB_COUNT is set to 0 to 3, and the flash bracketing takes three shots as one sequence.

When the exposure of one frame of the film is completed in this manner, and it is determined in step # 219 that a film is loaded, the process proceeds to step # 220, where the film is fed by one frame, and the process returns. If no film is loaded, the routine returns.

[0109]

As described above, according to the first aspect of the present invention, the FE is used in the flash bracketing photographing mode.
When the flash is locked, the information on the FE lock (information on the main light emission amount and the like) is maintained without being cleared even if the flash charging voltage becomes lower than the flashable voltage. It is possible to prevent the FE lock of the tent from being terminated halfway. Then, when the flash charging voltage recovers to the voltage at which light emission is possible, flash bracketing photography can be continued under the same FE lock state as in the flash photography of the previous scene.

When the FE lock is performed in the flash bracketing shooting mode (especially after flash shooting of at least one scene is performed), information regarding the FE lock and By clearing the information regarding flash bracketing, it is possible to prevent the flash bracketing from being continued in a state in which non-flash shooting is mixed and the continuity of flash bracketing shooting from being lost.

According to the second aspect of the present invention, the FE lock is performed in the flash bracketing shooting mode, and when at least one scene of the flash shooting is performed, updating of the FE lock is prohibited. Therefore, it is possible to prevent the FE lock information from being changed during one sequence of the flash bracketing shooting, so that the continuity of the exposure amount in the flash bracketing shooting cannot be maintained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of an electric configuration built in a single-lens reflex camera according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an optical arrangement of the single-lens reflex camera.

FIG. 3 is a control flowchart of a series of operations of the camera.

FIG. 4 is a control flowchart of a charging completion check and a flag process of the camera.

FIG. 5 is a control flowchart of a release operation of the camera.

FIG. 6 is a flowchart for calculating a flash emission amount in the camera.

FIG. 7 is a control flowchart of a charging completion check and a flag process of a camera according to a second embodiment of the present invention.

FIG. 8 is a control flowchart of a release operation of a camera according to a third embodiment of the present invention.

[Description of Signs] 100 MPU FELK_FEB Flag indicating that FE lock has been performed in the flash bracketing shooting mode FEB_COUNT Flag for counting the flash bracketing shooting scene FELK_FLG Flag indicating that FE lock is being performed

Claims (9)

[Claims] 1. An FE lock for setting a light emission amount at the time of photographing by a pre-flash of a flash can be performed before photographing, and
In a camera capable of setting a flash bracketing shooting mode in which a flash emission amount is increased or decreased by an arbitrary amount from a predetermined value for each flash shooting,
A camera comprising: a control unit that holds information on the FE lock when the E-lock is performed, even if the flash charging voltage is lower than the flashable voltage. 2. When the FE lock is performed when the flash bracketing shooting mode is not set, and when the flash charging voltage is lower than the light emission enabling voltage, the control means transmits information on the FE lock. The camera according to claim 1, wherein the camera is cleared. 3. The control unit holds information on the FE lock when the FE lock is performed in the flash bracketing shooting mode and the flash charge voltage is lower than the flashable voltage, 3. The camera according to claim 1, wherein when the flash charging voltage becomes equal to or higher than the light emission enabling voltage, flash bracketing is continued based on the held information on the FE lock. 4. 4. When non-flash photography is performed when the FE lock is performed in the flash bracketing photography mode, the control unit clears information about the FE lock and information about flash bracketing. 4. The method according to claim 1, wherein
The camera according to any one of the above. 5. An FE lock for setting a light emission amount at the time of photographing by a pre-flash of a flash before photographing can be performed;
In a camera capable of setting a flash bracketing shooting mode in which a flash emission amount is increased or decreased by an arbitrary amount from a predetermined value for each flash shooting,
A camera comprising: a control unit configured to hold information on the FE lock even when an E-lock is performed and at least one scene of a flash is captured, even if a flash charging voltage is lower than a flashable voltage. 6. When the FE lock is performed when the flash bracketing shooting mode is not set, and when the flash charging voltage is lower than the light emission enabling voltage, the control unit transmits the information on the FE lock. The camera according to claim 5, wherein the camera is cleared. 7. When the FE lock is performed in the flash bracketing shooting mode and flash shooting of at least one scene is performed, the control unit includes:
When the flash charge voltage is lower than the light emission enabling voltage, the information on the FE lock is held. After that, when the flash charge voltage becomes higher than the light emission enable voltage, the following information is stored based on the held information on the FE lock. The camera according to claim 5, wherein flash bracketing for photographing after a scene is continued. 8. The FE lock is performed when the FE lock is performed in the flash bracketing shooting mode and non-flash shooting is performed after flash shooting of at least one scene is performed. The camera according to claim 5, wherein the information and information on flash bracketing are cleared. 9. An FE lock for setting a light emission amount at the time of photographing by a pre-flash of a flash before photographing can be performed;
In a camera capable of setting a flash bracketing shooting mode in which a flash emission amount is increased or decreased by an arbitrary amount from a predetermined value for each flash shooting,
A camera having control means for prohibiting updating of an FE lock when an E-lock is performed and at least one scene of flash photography is performed.