JPH05323412A - Camera capable of shift-photographing of diaphragm and shutter speed - Google Patents

Abstract

PURPOSE:To obtain a camera capable of automatic shifting even in each of a diaphragm priority mode, a shutter speed priority mode, and a manual mode. CONSTITUTION:This camera is equipped with switches S4 and S5 for alternately selecting a diaphragm priority, exposure-mode, a shutter speed priority exposure mode, and a manual exposure mode, a switch S3 for setting a shift photographing mode for changing the combination of a diaphragm and shutter speed while an exposure value is kept constant, and consecutively taking plural pictures, and a controller 1 executing the shift photographing mode in the set exposure mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera for taking a plurality of photographs by changing a combination of an aperture and a shutter speed with a constant exposure value.

[0002]

2. Description of the Related Art Conventionally, there have been those which automatically take a number of photographs with a constant exposure value by changing a combination of an aperture and a shutter speed. However, this is an automatic program mode (P
Mode) only.

[0003]

Therefore, in the conventional shift photographing camera, automatic shift photographing cannot be performed in the aperture priority mode (A mode), shutter speed priority mode (S mode), and manual mode (M mode).
When shooting in these modes, the photographer must set the value by predicting the background blur effect due to the aperture and the flow of the subject due to the shutter speed, and the actual photograph will be what the photographer expected. It was different from. If the camera has a preview function (usually the aperture is open before shooting, but you can check the effect by closing the diaphragm before shooting) It can be set to a value, but this feature is limited to expensive cameras.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a camera capable of performing automatic shift in each of aperture priority mode, shutter speed priority mode, and manual mode.

[0005]

To achieve the above object, the camera of the present invention has a first setting means for selectively selecting an aperture priority mode, a shutter speed priority mode, and a manual exposure mode, and a constant exposure value. Second setting means for setting a shift shooting mode for continuously taking a plurality of pictures by changing the combination of the aperture and the shutter speed, and a second setting in the exposure mode set by the first setting means. And a control means for executing the shift photographing mode set by the means.

[0006]

With this structure, in the exposure modes of aperture priority, shutter speed priority, and manual exposure mode, it is possible to continuously take a plurality of pictures while changing the combination of the aperture and shutter speed while keeping the exposure value constant. it can.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall circuit configuration of this embodiment. In the figure, reference numeral 1 is a controller for controlling the camera, and all the circuits described below operate under the control of the controller 1. The controller 1 is specifically composed of a microcomputer.

Switches S1 to S7 are connected to the controller 1. The switch S1 is a switch for starting photometry and distance measurement, the switch S2 is a release switch, and S3 is a switch for switching between the normal shooting mode and the auto-shift shooting mode. S4 and S5 are switches that select the exposure mode by the combination thereof. Then, S6 and S7 are switches that select the shift amount according to the combination. There are three types of exposure shift amounts that can be selected in this embodiment: 1EV, 2EV, and 3EV.

Circuits 1 to 5 are further connected to the controller 1, 2 of which is a film information detection circuit for detecting film information such as the ISO sensitivity of the film and the number of films, and 3 is a shutter and aperture control. An exposure circuit 4 for performing exposure is a lens information reading circuit for reading lens information such as the focal length of the lens and the open F value. 5
Is a photometric circuit consisting of a light receiving element and its light receiving circuit,
The brightness BV of the subject is detected. Reference numeral 6 is a film drive circuit for winding the film.

Next, the control operation by the controller 1 will be described with reference to FIG.
~ It demonstrates according to the flowchart of FIG. First, when this flow starts, the switch S
It is determined whether 1 is ON, and if it is OFF, step # 15.
The number RL of auto-shift shooting is set to 0. When the switch S1 is turned on, the input data is fetched in step # 20. As the input data, the brightness BV of the subject given from the photometric circuit 5; the film sensitivity SV given from the film information reading circuit 2; the open aperture AV0Z and the minimum aperture AVMAXZ of the lens given from the lens information reading circuit 4; Built-in minimum shutter speed TVMIN, maximum shutter speed TV
MAX: switch data representing each state of the switches S1 to S7.

When all of these data are read in step # 20, the process proceeds to step # 25 and the number of photographed images RL is 0.
It is determined whether or not. This is the exposure value E during auto shift shooting.
Shoot with V fixed (ie step # 30 first
This is because the exposure value is calculated only once, and step # 30 is skipped for the second and subsequent shots). If the number of shots RL is not 0, the process proceeds to step # 30 and the subject brightness BV and film sensitivity SV are used. The subject exposure value EV is calculated. This value is used for calculation of the control aperture value AVC and the control shutter speed TVC in the subsequent processing. EV is calculated by the following formula. EV = BV + SV

At step # 40, the control aperture value AVC and the control shutter speed TVC are calculated by a known method. In this case, the calculation is naturally different in the following four modes. First, in the P mode, AVC,
Calculate TVC. In the A mode, the photographer sets the AVC, and the controller 1 sets the TVC to TVC = E accordingly.
Calculate from V-AVC. In S mode, the photographer is TVC
And set AVC to AV by the controller 1 accordingly.
Calculate from C = EV-TVC. In M mode, the photographer sets AVC and TVC.

When this calculation is completed in step # 40, the state of the switch S3 is determined in the next step # 50. Here, if the switch S3 is OFF, the normal shooting mode is set, and therefore the AV obtained in step # 40 is determined.
Proceed to step # 450 to expose C and TVC.
If the switch S3 is ON (auto shift shooting mode), the flow of steps # 60 to # 440 is executed and the process proceeds to step # 450. Steps # 60 to # 90
Then, processing is performed when the EV value is too large or too small. Since the exposure value that can be controlled by the camera is limited by the range of the aperture value of the lens and the shutter speed of the camera, the exposure value EV must be AV0Z + TVMIN ≦ EV ≦ AVMAXZ + TVMAX (1).

Therefore, in step # 60, EV is AV0Z.
If less than + TVMIN, EV = AV0Z + TV
In step # 70, AVC = AV0 to set MIN.
Set Z, TVC = TVMIN. Conversely, EV is A
Whether VMAXZ + TVMAX is greater than step #
It is judged at 80, and if larger, EV = AVMAXZ + TVM
AVC = AVMAX in step # 90 to be AX
Let Z and TVC = TVMAX.

When the EV satisfies the above condition (1), the process proceeds to step # 100. Steps # 100 to # 14
At 0, the shift amount is set based on the states of the switches S6 and S7. Here, if both S6 and S7 are OFF, 1EV S6 is ON, and if S7 is OFF, 2EV If S7 is ON, 3EV is set regardless of the state of S6.

Next, in steps # 150 and # 160, in order to change the diagram only in the P mode, the switch S4,
The state of S5 is determined. The exposure mode is determined in advance as follows. S4 is OFF, S5 is OFF, P mode is S4 is ON, S5 is OFF, A mode is S4 is OFF, S5 is ON, S mode S4 is ON, S5 is ON, M mode

If a mode other than the P mode is confirmed in steps # 150 and # 160, the process proceeds to step 290.
If the P mode is confirmed, steps # 170 to # 28
The flow of 0 (the flow of changing from the diagram of FIG. 9 to the diagram of FIG. 10) is executed. First, steps # 170 and # 180
Then, the process is performed when the EV value is too small to secure the set shift amount. Also, steps # 190 and # 20
If the value is 0, the value of EV is too large to secure the set shift amount. That is, the exposure value that can secure the shift amount is limited by the aperture value of the lens, the shutter speed of the camera, and the set shift amount, and the exposure value EV is AV0Z + TVM.
IN + 2ΔEV ≦ EV ≦ AVMAXZ + TVMAX-2
Must be ΔE. Therefore, if EV <AV0Z + TVMIN + 2ΔEV in the determination of step # 170, then in step # 180, AVC = AV0Z + (1/2). {EV- (AV0Z + TVMIN)} TVC = TVMIN + (1/2). {EV- ( AV0Z + TVMIN)}.

On the other hand, EV> A in the judgment of step # 190.
When VMAXZ + TVMAX-2ΔEV, in step # 200, AVC = AVMAXZ + (1/2). {(AVMAXZ + TVMAX) -EV} TVC = TVMAX + (1/2). {(AVMAXZ + TVMAX) -EV}. FIG. 10 according to the above steps # 180 and # 200.
The symbols # 180 and # 200 are attached to the diagram portion of FIG.

In steps # 210 and # 220, AVC <A
When V0Z + ΔEV, AVC is changed to enable shift shooting. At this time, AVC = AV0Z + ΔEV and TVC = EV-AVC accordingly. Steps # 230 and # 240 change TVC to enable shift shooting when TVC <TVMIN + ΔEV. At this time, TVC = TVMIN + ΔEV, and accordingly AVC = EV-TVC. Steps # 250, # 2
Reference numeral 60 changes AVC when AVC> AVMAXZ-ΔEV to enable shift shooting. At this time, AVC =
AVMAXZ-ΔEV and TVC = EV accordingly
-It is AVC. Steps # 270 and # 280 are TVC
> When TVMAX-ΔEV, TVC is changed to enable shift shooting. At this time, TVC = TVMAX-Δ
Let EV and accordingly AVC = EV-TVC.

By the above, the diagram of FIG. 9 is changed to the diagram of FIG. Steps # 290 to # 440 are a flow that is passed as long as it is in the auto-shift shooting mode in both the P mode and the other A, S, and M modes.
Here, first, in step # 290, it is determined whether or not the number of shots RL for auto shift shooting is zero. In this embodiment, three auto-shifts are performed, and those AVC,
The TVC is as follows. 1st sheet: AVC-ΔEV, TVC + ΔEV 2nd sheet: AVC, TVC 3rd sheet: AVC + ΔEV, TVC-ΔEV

In step # 290, if the number of shots RL is 0, it means that the shift shooting is the first shot, and therefore steps # 300 to # 360 are performed. Step #
300, AV, TV to determine the exposure value of the first
And AV = AVC−ΔEV, TV = TVC + ΔE
V. A in A mode, S mode, and M mode
V, TV is AV0Z ≦ AV ≦ AVMAXZ, TVMIN
Since the range of ≦ TV ≦ TVMAX may be exceeded, steps # 310 to # 360 are performed.

When AV ≧ AV0Z and TV ≦ TVMAX, the shift photographing can be performed with the value as it is, and the process proceeds to step # 450. AV <AV0Z and TV ≦ TVM
In the case of AX, TVC = (AVC +
TVC) -AV0Z and AVC = AV0Z. AV ≧
If AV0Z and TV> TVMAX, step #
At 360 AVC = (AVC + TVC) -TVMAX, T
Let VC = TVMAX. AV <AV0Z and TV>
In the case of TVMAX, AV0Z-A is executed in step # 340.
By comparing the values of VC and TVC-TVMAX, AV0Z-
If AVC <TVC-TVMAX, step # 350
And TVC = (AVC + TVC) -AV0Z, AVC = A
If V0Z and AV0Z-AVC ≧ TVC-TVMAX, AVC = (AVC + TVC) in step # 360.
-It is TVMAX.

After the processes of steps # 310 to # 360 are completed, the process proceeds to step # 450. On the other hand, if RL = 0 (first shot) in step # 290,
The process directly proceeds to step # 370.

In step # 370, it is determined whether or not the number of shift images is the third (RL = 2). If the number of shots is not the third shot, it means that it is the second shot (it has already been determined in step # 290 that it is not the first shot). Without doing, go to Step # 450. However, RL =
If it is 2, it means that the number of shots is the third shot, so the shift processing for the third shot is performed in steps # 380 to # 440.

At step # 380, AV = AVC + ΔE
V, TV = TVC-ΔEV. And step #
If AV> AVMAXZ in 390 to # 440 or if TV <TVMIN, the processing is performed. That is, AVC,
AV ≦ AVMAX to keep TVC within control range
When Z and TV ≦ TVMIN, the shift photographing can be performed with the same value, and thus the process proceeds to step # 450. AV
> AVMAXZ and TV ≧ TVMIN, TVC = (AVC + TVC) −AVMA in step # 430.
In XZ, AVC = AVMAXZ. AV ≤ AVMAX
If Z and TV <TVMIN, step # 440.
And AVC = (AVC + TVC) −TVMIN, TVC =
TVMIN. AV> AVMAXZ and TV <T
If it is VMIN, AVC-AVM is executed in step # 420.
The values of AXZ and TVMIN-TVC are compared, and AVC-
If AVMAXZ <TVMIN-TVC, step #
At 430, TVC = (AVC + TVC) −AVMAXZ,
AVC = TVMAXZ, AVC-AVMAXZ ≧ T
In the case of VMIN-TVC, AVC = in step # 440.
(AVC + TVC) -TVMIN, TVC = TVMIN
And

In step # 450, the state of the release switch for performing the exposure operation is determined. Here, if the release switch S2 is not ON, the number of shots RL is reset to 0 in step # 510 and then the process proceeds to step # 520. If the release switch S2 is ON, the state of the switch S3 is determined in step # 460 in order to distinguish whether or not the auto-shift shooting mode is set. Switch S3
Is ON (shift shooting mode), step # 480
To determine whether the number of shots is the fourth (RL = 3),
If it is the fourth sheet, step #
Proceed to 520, and if it is not the fourth sheet, R at step # 490.
After incrementing L by 1, in step # 500, AVC and TVC are output to the exposure circuit 5 for exposure. After that, the process proceeds to step # 520.

If the switch S3 is OFF in the determination in step # 460, the number of shots RL is set to 0 in step # 470.
After being reset to, exposure is performed in step # 500, and the process proceeds to step # 520. In step # 520, the process returns to step # 10 to continue the control.

In the above embodiment, the shift amount ΔEV
, One of 1EV, 2EV, and 3EV is selected by the switches S6 and S7, and the three shift pictures with different exposures and different combinations of aperture and shutter speed are selected by using the selected shift amount ΔEV. , A, S, M modes can be taken. This is because, in the above-described flow, the flow from step # 290 for shifting is executed not only in the P mode but also in the A, S, M modes.

However, in the above embodiment, only in the case of the P mode, the above steps 1170 to # 280 (the processing of changing the diagram of FIG. 9 to the diagram of FIG. 10) are performed,
No matter which shift amount of 2EV or 3EV is selected, AV and TV have different predetermined shift amounts of 3 as intended by the photographer.
Although one shift photograph can be obtained, in the A, S, and M modes, steps # 310 to # 44 are performed without such treatment.
Since only the process of limiting the range of images that can be taken by the camera to 0 is performed, one of the three photos may be taken without being able to shift by a predetermined amount.

In this way, in the A, S, and M modes, the same allowance as in the P mode described above (steps # 170 to # 280).
The reason for not performing is that in these A, S, and M modes, it is necessary to give top priority to taking a picture at the aperture and shutter speed that the photographer has decided to take. Therefore, of the remaining photographs (two out of three) taken to shift a predetermined amount from the aperture or shutter speed determined by the photographer, the shift is not the intended shift (for example, A mode). If the aperture is set close to the maximum aperture AV0Z, one of the three apertures is limited to the maximum aperture and the intended ΔEV shift is not performed).

[0031]

As described above, according to the present invention, a plurality of photographs are obtained by changing the combination of the aperture and the shutter speed while keeping the exposure value constant in each of the aperture priority, shutter speed priority, and manual exposure modes. Since it is possible to shoot continuously, it is not necessary for the photographer to decide the aperture and shutter speed by predicting the background bokeh effect and the flow condition as in the past, and it is possible to select from multiple photographs taken by shift shooting. Just choose what you want.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit configuration of a camera embodying the present invention.

FIG. 2 is a flowchart showing the control operation of this embodiment.

FIG. 3 is a flowchart continued from FIG.

FIG. 4 is a flowchart continued from FIG.

FIG. 5 is a flowchart continued from FIG.

FIG. 6 is a flowchart continued from FIG.

FIG. 7 is a flowchart continued from FIG. 6;

FIG. 8 is a flowchart continued from FIG.

FIG. 9 is an AE diagram in P mode according to the present embodiment.

FIG. 10 is an AE diagram in which the AE diagram of FIG. 9 is changed for auto shift shooting.

[Explanation of symbols]

1 Controller 2 Film Information Detection Circuit 3 Exposure Circuit 4 Lens Information Reading Circuit 5 Photometric Circuit 6 Film Drive Circuit S2 Release Switch S3 Switch for Normal Shooting Mode / Auto Shift Shooting Mode S4, S5 Exposure Mode Selection Switch S6, S7 Shift Switch for quantity setting

Claims (1)

[Claims] 1. A first setting means for selectively selecting an aperture priority mode, a shutter speed priority mode, and a manual exposure mode, and a plurality of photographs by changing a combination of an aperture mode and a shutter speed while keeping an exposure value constant. Second setting means for setting a shift shooting mode for continuous shooting, and control means for performing the shift shooting mode set by the second setting means in the exposure mode set by the first setting means , Equipped with a camera.