JPS62163034A - Camera capable of trimming photographing - Google Patents

Abstract

PURPOSE:To make the depth of field confirmed at a preview time correspond to the depth of a finished picture and to remove the misconfirmation of the depth by opening a diaphragm largely if a trimming photographing mode is selected when a preview operating means for confirming the depth of field is operated at a trimming photographing time. CONSTITUTION:When trimming size in an equivalent stop value calculating routine is half size, a value obtained by stopping down practically calculated stop value Av by one level is set up as the equivalent stop value, and in case of quarter size, a value obtained by stopping down the step value Av by two levels is set up as the equivalent stop value. When the trimming size is half size, the practical stop value Av is opened by one level, and in case of quarter size, the value Av is opened by two levels. Since the depth of a picture obtained by trimming photographing becomes thinner that of a picture obtained by the normal photographing mode even if the same stop value is used, the stop value at the preview time is opened by a prescribed level by a preview button 4 so that the confirmed depth coincides with the depth of a finished picture.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera that enables cropping photography.

[Description, *-Talk i-she small concave control] Normal 1 to print the entire shooting screen area! In addition to the shadow mode, there was a camera developed in Japanese Patent Application Laid-open No. 5 (1973) that enabled so-called shimming photography, which allowed information for specifying printing in a narrow area of the shooting screen to be recorded on the film.
4-26721 and Utility Model Application Publication No. 60-145728, it is possible to obtain the effect of photographing using a telephoto lens by enlarging a specified portion to a predetermined size during printing. It has become.

It is known that a photograph obtained by a camera capable of such cropping has a shallower depth of field than a photograph obtained by normal photographing with the same aperture and cropping.

Therefore, in order to confirm the depth of field during actual shooting, the subject was confirmed by operating the preview button and stopping down to the shooting aperture value! ? The iL depth was deeper than the photo actually obtained by cropping, and there was a risk of misunderstanding the depth.

[Objective of the Invention 1 This invention was made in order to eliminate the above-mentioned problems, and when the depth of field is confirmed using the preview button during cropping shooting, the aperture value at the time of previewing is corrected and the finished photo is An object of the present invention is to provide a camera capable of cropping and photographing that can correspond to the depth of images.

[Configuration 1 of the Invention The camera capable of cropping photography of the present invention includes a photography mode selection means for selecting a normal photography mode and a cropping photography mode that can specify an area narrower than the range to be printed in the normal photography mode, and A preview operation means that narrows down the aperture to the aperture value at the time of shooting in order to confirm the depth of field at the time of shooting, and a normal shooting mode when the above-mentioned cropping shooting mode is selected when the preview operation means is operated. The present invention is characterized by comprising a control means for opening the aperture larger than when selected.

[Embodiment 1] Hereinafter, one embodiment of a camera capable of cropping photography according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show the appearance of the five-piece reflex camera body of this embodiment. 1 is a button to switch the trimming size, and each time you press this button 1, it will change in the following order: → No trimming Half size (1/2) Landscape Quarter size (1/4) Landscape Half size Portrait Quarter size Portrait → It has become. 2 is a main switch of the camera, and when this main switch 2 is off, all operations as described below are prohibited. Reference numeral 3 denotes a shutter release button, and photometry is started when the button 3 is pressed in the first step, and a release operation is performed in the second step. 4 is a preview button, and while this button 4 is pressed, the aperture value is narrowed down to the actual shooting aperture value, so that the depth of field at the time of actual shooting can be known. 5 is a finder.

6 is an up/down switch for changing the shutter speed (Tv). In Fig. 2, each time this switch 6 is pushed to the right, the shutter speed changes one step to the high speed side. Conversely, each time you press the button to the left, the shutter speed changes one step to the lower speed side. 7 is an accessory for attaching a flash device to the camera body.
8 is a connector for exchanging information between the flash device and the camera body when the flash device is attached to the accessory shoe 7.

Reference numeral 9 denotes a switch for switching the photometry mode Y between average photometry that measures the entire photographic screen and spot photometry that measures only a predetermined narrow area. 10 is the aperture value (
This is an up/down switch for changing the A v ), and each time the switch 10 is pushed upward in FIG. 2, the aperture opens one step at a time. ．．壬1
C) The aperture is conversely narrowed down one step at a time from Kinoshita 411111 to -1111+X5.

11 is the shooting mode changeover switch, and this switch 1
Each time the button 1 is pressed, each mode changes in the following order: →P (program) mode, A (aperture priority) mode, M (manual) mode, S (shutter speed priority) mode→. 12 is a lens lock button for fixing the lens to the camera body, and 13 is a signal transmission pin for transmitting information from the lens to the camera body. 14 is an aperture return lever, and this lever 1
4, the camera controls the aperture of the lens. LDI is a liquid crystal display (
LCD).

FIG. 3 shows a side sectional view of the camera in FIGS. 1 and 2. FIG.

Reference numeral 15 denotes a semi-transparent mirror that can be used during the day with one end as a fulcrum. 1G is a reflection plate for guiding the subject light transmitted through the mirror 15 to the light receiving element PD, and 17 is a semi-transparent mirror 1.
18 is an eyepiece provided at the rear of the pentaprism 17. LI) 2 is a semi-transparent mirror 15.
This is a focus plate consisting of an LCD installed in the optical path of the reflected light.For example, one of the two glasses that make up the LCD can be made into a matte surface to function as a focus plate, and it can also be used to display shooting information in the viewfinder. It is possible to do both at the same time.

19 is the back cover of the camera body, and the inner surface of this back cover 19 is shown in FIG. LED1 and LED2 are light-emitting diodes for imprinting coded trimming information and equivalent focal length, which will be described later, on the side of the film screen.When recording with a hood, they are converted to numerical values and recorded on the print when printing.9 20 is from the camera body to the LE
This is a connector for transmitting information to DI and LED2.

FIG. 5 is a detailed view of the focusing plate LD2, and shows a.

111eldle shows the display contents by LCD segments provided corresponding to the four corners of the image frame on the print obtained by cropping shooting, and depending on the trimming mode setting, 1), either segment a or d lights up. do. For example, when half-size horizontal trimming is set, only segment a lights up and segments b, c, and d turn off, and when 1/4-size vertical trimming is set, only segment a lights up (the pond segment). Only c lights up.

e shows the shooting information displayed at the bottom of the focus plate LD2, starting from the left end, the aperture is F5.6 and the shutter speed is 1/
250 seconds, P mode, and I indicates charging completion in flash mode.

FIGS. 6(a), 6(b), and 6(c) only show the photographing information display section e, and indicate that A mode, M mode, and S mode have been selected, respectively.

FIG. 7 shows a detailed view of Dl described above.

f is a segment for displaying the shooting mode, ri is a segment for displaying film sensitivity, 11 is a segment for displaying shutter speed, ; is a segment for displaying trimming shooting, and the characters TRI MM I NG are displayed during trimming shooting. It lights up, and nothing lights up during normal shooting. j
is a segment for displaying the aperture, and k is a segment for displaying the aperture, which is displayed only when shooting with trimming. The term "equivalent focal length" means that by using a telephoto lens, etc. without cropping, you can obtain the same depth of field in the same image frame as the print obtained by cropping. The focal length and aperture of the telephoto lens and the like are often referred to as the equivalent focal length and the like. By knowing this equivalent focal length and equivalent focal length, it becomes possible to easily recognize the telephoto effect and depth in prints obtained by cropping photography.

p is a segment for displaying the focal length of the photographing lens, and In is a segment for displaying the equivalent focal length during cropping photography. n is a trimming mode display segment; when half size, l+alr is displayed; when quarter size, quarLer -h' is displayed;
In this case, 0[
1 is displayed.

Figure 8 shows an example of LDI display, in A mode, film sensitivity is 15O400, no cropping, shutter speed is 1/250 seconds, aperture value is F5.6,
It shows that the focal length of the lens used is f''135 mm.

Also, in Figure 9, in M mode, the film sensitivity is 15O2.
00, in the case of cropping photography, the shutter speed is 1/125 seconds, the aperture value is F2.8, the focal length of the lens used is r = 35 + + m, and the calibration value is F4, equivalent focal point. This indicates that the distance is f=50+am and the trimming size is a vertically long half size. Therefore, if the print obtained by this cropping photography is extended to the size of the predetermined image frame in normal photography, the aperture value is F, the depth of field is t, and the lens whose focal length is f = 50mm. This corresponds to when using .

FIG. 10 shows one of the control circuits applied to the camera of the present invention.
An example is shown.

100 is a microcomputer consisting of a CPU (central processing circuit), and signals from each switch as described below are input to the manual boat Ix, and control signals are sent from the output capo Ox to each device. . Sl is a switch that is turned on when the shutter release button 3 is pressed in the first step, and S2 is a switch that is turned on when the shooting mode switching button 11 is pressed. , S3 is a switch linked to the trimming switching button 1, and S4 is a switch linked to the lens lock button 12, which is turned on when the lens is attached or removed. S5 has a back cover of 19
S6 is a switch that is turned on when the back cover 19 is opened, and S6 is a switch that is turned on when the shutter release button 3 is pressed in the second step.

S7 is a switch that is turned on in conjunction with the preview button 4, and S8 is a switch that is turned on in conjunction with the photometry mode changeover switch 9. S9 is a switch that is turned on by the release operation of the shutter release button 3 and turned off when the film winding is completed. 510-1,5IO-
2 is a switch linked to the shutter speed up/down switch 6, and when the shunter speed is set to the high speed side, the switch 5IO-1 is turned on and the i! ! to low speed (1
When set to tll, switch S10-2 is turned on.

Sl 1-1. Sl 1-2 is a switch that is linked to the aperture up/down switch 10, and when the aperture is set to the open side, the switch 5ll-1 is turned on, and conversely, when the aperture is set to the narrowed side, the island switch 5ll-2 is turned on. become.

S12 is a switch linked to the main switch 2.

One terminal of each of the switches 81 to S12 is grounded, and the other terminal is connected to the microcomputer 10.
0 input ports I, to I+4. These input ports 11 to I+4 are each pulled up to "H" by a resistor R connected to a positive voltage at one end, and by closing each switch 81 to 312, each input port E, to It becomes L”.

In addition, each input port 11 to I4 is connected directly to one input port)
Is is connected to the input section of an AND circuit 102 via a differentiating circuit 101, and the output section of this AND circuit 102 is connected to the interrupt terminal lN of the microcomputer 100.
Connected to Tl. And input port 1. and the indexing terminal INT2 of the microcomputer 100 are connected. The input signal to this interrupt terminal lNTl changes from "H" to "
An interrupt is applied to the microcomputer 100 when the switch 8 changes to "L".
The AND circuit 102 is turned on by the output signal from the differentiating circuit 101 when any one of S1 to S4 is turned on or when the switch S5 is turned on or off, and an interrupt is generated by the interrupt terminal lNTl. Further, the interrupt terminal INT2 is configured to generate an interrupt when the human input signal changes from "L" to "HII".

I'C is a flash control unit that is connected to the 7 lasier device via the flash connector 8, and controls the equivalent focal length, trimming mode, and interlocking for switching the light distribution characteristics via the output port ○[C. Shooting aperture for distance display and guide number control. Then, a signal indicating the completion of charging is input from the Risch control section FC to the input port L and the photometry section LM. The photometer LM measures the brightness By of the subject, and has an output capo of 0. ．． A signal indicating whether the photometry is average photometry or spot photometry and a photometry permission signal are input from 02, and the photometry data is manually inputted to the input port IN111. Further, a stop signal for stopping the light emission from the photometer LM is sent to the 7-inch control unit FC. Thereby, photometry is started at the same time as the flash is emitted, and when the amount of photometry reaches a predetermined amount, a stop signal is sent to stop the flash device from emitting light.

AC is an aperture control section, and a stepping motor SM for opening and closing the aperture mechanism is driven in accordance with a signal from the output boat nc. When the aperture operation that goes up to the stepping motor SM stops, the aperture control gAC starts from the aperture control gAC.
6, an aperture stop signal is sent. SC is a mirror/shutter control unit, and output capo)0. ．． From 04 and 05, release signal, signal 1 that controls the shutter front curtain and rear curtain
1. , a mirror-up completion signal to notify that the mirror 15 has rotated upward, and a 7-lash light emission signal to start the flash device to the flash control unit FC.

DS is the output capo) Display device LD according to the signal from Ods
It is a display control unit that displays data on I and LD2, and B
Z is a buzzer that warns of camera shake according to a signal from the output boat 06, and a control unit for this buzzer. The PC outputs information from the Opc to the light emitting diodes LEDI and LE.
This is an imprint control section for recording on the film by D2, and is operated by an imprint signal from the output port 07. DX is input by reading the hood showing the film speed shown on the film cartridge.
LN is a lens, and from this lens LN, the focal length, open aperture value, minimum aperture value, etc. are sent to the input lens (INn).

Next, the operation of the control circuit will be explained according to chart 70.

The flowchart in FIG. 11 shows an interrupt routine using the interrupt terminal lNT1.

As described above, when an interrupt is applied to the interrupt terminal lNTl due to any of the switches 81 to S4 being turned on, or due to the switch S5 being turned on or off, the interrupt is processed in step #1. Transmission terminal lNTl
Interrupts are prohibited. This is because an F trouble will occur if an interrupt occurs again in the subsequent processing process.

Next, in step #2, it is determined whether the switch S12, that is, the main switch 2 is on, and if it is off, the process proceeds to step #12, where the interrupt prohibition of the interrupt terminal lNTl is canceled, and the process proceeds to step #13. Then, unnecessary locks in the microcomputer 100 are stopped, and a standby state is entered in which power consumption is minimized. On the other hand, if main switch 2 is on, switch S is turned on in step #3.
1 is on, i.e. shutter release button 3
It is determined whether or not the button has been pushed in to the first stage. If it has been pushed in, the process proceeds to a photometry routine to be described later; if it has not been pushed in, the process proceeds to step #4. In step I4, it is determined whether the switch S2 is pressed, that is, whether the mode switching button 11 is pressed. If it is pressed, the process proceeds to step #16, and after the photographing mode is changed, the process proceeds to step #10.

On the other hand, if the mode switching button 11 is not pressed, the process proceeds to step #5, where it is determined whether the state of the switch S4, or whether the lens lock button 12 has been pressed to attach or detach the lens. If lens lock button 12 is pressed, step #
The process proceeds to step 15, where the set trimming mode is reset, and the process proceeds to step 10. On the other hand, lens lock button 1
If 2 is not pressed, the process proceeds to step #6, and it is determined whether the switch S5, that is, the back cover 19 is opened.

If one back cover is opened due to film replacement, proceed to step #15, reset the trimming mode, and proceed to step #10.
I gate f (tr bi gate tom bald inishi swing 1 + spotted #7
Go forward one step. In step #7, the state of the switch S3, that is, the trimming changeover button 1, is determined, and if this button 1 is pressed, the process advances to step #14, and as described, the trimming size is changed every time this button 1 is pressed. It is possible to switch sequentially, and then proceed to step #10.

On the other hand, if the trimming switch button 1 is not pressed, the process proceeds to step #8, where the film sensitivity is read by the code reading unit DX, and in the next step #9, the reading r
The film sensitivity setting is changed based on this film sensitivity. In step 10, the above settings are displayed on the display LDI. After that, in step #11, the output of each output port ○
The microcomputer 100 enters the standby state.

FIG. 12 is a routine showing an interrupt to the interrupt terminal INT2.

When main switch 2 turns from on to off, terminal IN
T2 changes from "L" to "I(", and an interrupt occurs. When this interrupt occurs, all interrupts are prohibited in step I57 to prevent this routine from being interrupted midway by an interrupt. Step #58
at each output port.

X, reset the trimming mode at step 59, and set the normal shooting mode.

When the main switch 2 is turned off in this way, when the lane lock button 12 is turned on for attaching/detaching the lens as described above, or when the back cover 19 is turned on for changing the film.
When it is clearly necessary to return to the normal photographing mode, such as when opening or closing the camera, the trimming mode Y is automatically reset and the normal photographing mode is restored. This prevents failures in shooting due to forgetting to cancel trimming mode.

At step #60, data for standby display is sent to the display control section DS, and at step #61, the standby display is displayed on the display LDI.

Then, in step #62, the interrupt terminal lNTl is set.

Interruption to INT2 is permitted, and the standby state is entered at step I63. Note that when the main switch 2 is off, the camera does not operate as described above.

FIG. 13 shows a flowchart of the photometry routine, and when the shutter release button 3 is pressed to the first stage in step #3 described above, the process proceeds to this photometry routine.

At step #17, a photometry permission signal is sent from the output port 02 to the photometry section LM, thereby starting photometry. At step #18, press the trimming size switching button 1.
Is the trimming mode set by? 11
If the trimming mode has been set, the process proceeds to step #21, where spot photometry is set for the microcomputer 100, and the process proceeds to step #22.

In this manner, during cropping photography, regardless of the setting status of the photometry mode changeover switch 9, the photometry is forcibly switched to spot photometry, so that the photometry is not performed on areas outside the trimming frame. On the other hand, if the trimming mode is not set, the mode set by the photometry mode changeover switch 9 is determined in step #19, and if it is set to the spot photometry side, spot photometry is set in step #21; , if it is set to the average photometry side, average photometry is set in the microcomputer 100 in step #2o. In the next step #22, lens information such as the focal length, maximum aperture, and minimum aperture is taken in from the lens LN.

In step 23, an equivalent focal length is calculated based on the focal length of the lens and the trimming size using an equivalent focal length calculation routine to be described later. In the next step #24, switch 5IO-1, 2, switch 5ll-1, 2,
That is, the shutter speed (
Tv) and aperture (AV) are taken in. Step #2
At step 5, information on the photographing mode, trimming mode, mounting state of the lens LN, and opening/closing state of the back cover 19 is taken in, as described above, depending on the states of the switches 82 to S5.

In step #26, when the photometric value from the photometric unit LM is input to the input capo (11+o), in step #27, the shutter speed Tv and aperture value Av are determined by an exposure calculation routine to be described later based on the photometric value. At the same time, the calibration value is calculated. These calculation results and the equivalent focal length are displayed on the display LDI in step #28.

In this way, by displaying the equivalent focal length and the focal length value on the display LDI, it is possible to easily know the depth of field and telephoto effect when cropping photography is performed.

In the next step #2, flash information such as the equivalent focal length is sent from the output capo (Orc) to the reflash control unit FC in order to change the light distribution characteristics. This allows the lens on the front of the light emitting unit to be moved by a motor etc.
The beam angle can be changed. At Ste Nbu #30,
What is the status of switch s7 and preview button 4? lI is set and this button 4 is pressed, in step #31,
The preview aperture value calculated from the photometric value in the calculation routine is sent from the output port ○ac to the aperture control unit AC, which activates the stepping motor and controls the lens L.
N is narrowed down to a predetermined aperture i) value. On the other hand, if the preview button 4 is not pressed, in step #32, the maximum aperture value of the lens is sent to the aperture control unit AC, and the aperture of the lens LN is in the open state.
;Go forward. At the Stellar well 33, the state of the photometry switch S1, which is turned on in the first step of the shutter release button 3, is determined. If this switch S1 is turned on, the process advances to step #35, and the power hold timer is set. It is reset and proceeds to the next step #38.

Therefore, when the photometry switch S1 is on, the power is maintained by resetting the hold timer. If the switch S1 is off, step #
At 34, the power hold timer determines whether a predetermined time has elapsed (overflow), and the
-, the output port O< is reset in step #36, and an interrupt to the interrupt terminal lNTl is permitted in step #37, and then the process proceeds to step #56, where it enters a standby state. On the other hand, at step #34, over 70-
If not, proceed to step #381 again, and it is determined whether switch S9 is on or off, that is, whether there is a release operation of shutter release button 3, or whether film winding is completed, and film winding is completed. Regardless of the operation of the chanter release button 3, the above step #18 will not release the shutter when the shutter release button 3 is not activated.
Return to and repeat the above process.

On the other hand, if the winding of the film has been completed, the process advances to step #39, and it is determined whether the switch S6, that is, the chanter release button 3 has been pushed to the second stage. Returning to #18, the above process is repeated, but if the shutter release button 3 has been pressed down to the tpJ2 stage, the process advances to the next step #40. In step #40, photometry by the photometer LM is prohibited, and signals for the camera shake buzzer BZ and the like are reset to prepare for release. In step #41, the imprint information to be recorded on the film, that is, the trimming mode signal and the equivalent focal length, is sent to the imprint control unit PC, and in step #42, the shooting aperture value is sent to the aperture control unit AC. By doing so, the aperture of the lens LN is narrowed down.

In the next step #43, a release signal is sent from the output port 03 to the mirror/shutter control unit SC, and the mirror 15 is rotated upward. Then, in step #44, an imprint signal is sent from the output port 07 to the imprint control unit PC, and the imprint information is recorded on the film.

In steps #45 and #46, it is determined whether the narrowing down operation and the raising of the mirror 15 are completed or not, and when each operation is completed, the process proceeds to the next step #47. Step #
At step 47, the photometry mode is switched to average photometry for flash dimming. Then, with the step key 48, the signal 1c is sent from the output port O1 to the mirror/shutter control unit SC.
1) At the same time as the shutter front curtain starts and exposure starts, the timer in the microcomputer 100 operates to count the shutter speed time, and when the counting is completed, , at step #50, the signal 2c is sent from the output port 05 to the control unit SC, thereby starting the shutter trailing curtain and stopping the exposure.

Further, when the shutter front curtain is fully opened, a flash light emission signal is sent from the mirror/shutter control section SC to the 7 lash control section FC, and the flash device emits light. The 1111 flash destination reflected by the subject is integrated by the photometer LM, and when this integrated value reaches a predetermined value, the photometer LM sends a stop signal to the 7-flash control unit FC, causing the flash to fire. stops. In step #51, the process waits for a time until the shutter rear curtain has completely run out, and then the process proceeds to step #52. In step #52, information for displaying the standby state by extinguishing the shutter speed and aperture value displayed on the display LD1 is created, and this information is transferred to the display in step #53. Displayed on LDI. Thereafter, in step #54, the output capacitor Ox is reset, and in step #55, an interrupt to the interrupt terminal 1NTl is permitted, and then the process proceeds to step #56 to enter a standby state.

Next, the method for calculating the equivalent focal length is shown in FIG. 17(a).

This will be explained using (b).

In Fig. 17(a), X is the photographing lens, f is its focal length, and T is the height of the image projected onto the film Y in the normal photographing mode, where the image height is αT. Consider the case of trimming like this.

There is the relationship Lar+ω=T/f, tanω゛=αT/f, and FIG. 17(b) shows the relationship when the image height of αT obtained by trimming is extended to T, and × is the equivalent focal length.

In this case, from tanω' = T/x, x=T/
lanω'=T/(αT/I)=f/α...■.

As a result, for example, if the focal length r is 35+nm and the image height is trimmed to 172, then α=1/2 and the equivalent focal length is 35/(1/2).
Near 016111, and the trimming size is 1
Sat 174. Furthermore, if the trimming is half size, the value of a will be 1/-6.

Therefore, as shown in the equivalent focal length calculation routine in FIG. 14, in the case of half-size trimming, step #
The value obtained by multiplying the focal length of the lens by 1" in step #23-2i2 is the equivalent focal length, and if the size is 1/4, the value obtained by multiplying the focal length of the lens by 2 in step #23-4 is the equivalent focal length. This is the focal length.

FIG. 15 shows the exposure calculation routine described above.

At step #64, an exposure value Ev is calculated from the brightness value Bv of the subject inputted from the photometry section LM and the film sensitivity Sv inputted from the hood reading section DX. (Ev=
Bv+Sv) Then, in step #65, the state of the preview button 4 is determined. Exposure calculation is complicated during preview operation, so it is not performed in this routine, but is performed in step #95 in case the aperture value or preview aperture value is changed due to a change in trimming mode during shooting. Only the preview aperture calculation is performed several times.

On the other hand, if it is not a preview operation, step #66;
The photographing mode is determined in #67 and #68.

If it is M (manual) mode, the process proceeds to step #69, where the manually set aperture value (Av) is read, and then, at step #70, the shutter speed Tv, which was also manually set, is read. If it is determined in step #71 that it is flash photography and charging is complete, then in step #72 the shutter speed Tv is held down so that the shutter speed Tv is synchronized with the light emission of 7 lashes. After that, the process advances to step #95.

On the other hand, in the S (shunter speed priority) mode, the process proceeds from step #68 to step well 73, where the manually set shutter speed Tν is read, and in the next step #74, the above Ev value and Tv The aperture value Av is calculated from the value. Then, based on the determination in step #75, if the flash photography is not performed, the process proceeds to step #95, but if the flash photography is determined and charging is completed, step #76 is performed.
The shutter speed is held down so that the shutter speed Tv is synchronized with the light emission of 7 lashes. After setting the aperture value Av to F5.6 in step #77, it is determined in step #78 whether it is cropping shooting,
If it is trimming photography, the aperture is shifted to the open side in accordance with the number of trimming stages in step #79, but if it is not trimming photography, the process proceeds to step #95.

If the A (aperture priority) mode is selected, the process proceeds from step #67 to step #80, where the manually set aperture value A is set.
v is read, and in the next step #81, the shutter speed TV is calculated from the above Ev value and Av value. Then, as determined in step #82, if it is flash photography and charging is completed, the shutter speed is set to 1/60 seconds in step #83, and then the process proceeds to step #95. On the other hand, if it is not flash photography, step #84
The shutter speed for warning by the camera shake warning buzzer BZ is controlled based on the equivalent focal length as shown in Table 1.

Table 1 Equivalent focal length Camera shake warning Shutter speed 35 m
m or less 1/30 seconds 35m+a -105+
am 1760 seconds 1051 or more
1/100 second This means that for cameras that use cropping to increase the magnification during printing to achieve the same effect as shooting with a long focal length lens, it is meaningless to determine the camera shake warning solely by the focal length of the lens. Since there is no camera shake warning shutter speed as shown in the table above, the camera shake warning shutter speed is set according to the equivalent focal length.

Also, when in P (program) mode, step #66
The process then proceeds to step #85, where a program for determining the relationship between the shutter speed Tv and the aperture value Av according to the equivalent focal length is selected, and a diagram of this program is shown in FIG.

In FIG. 18, program lines A, B, and C indicate equivalent focal lengths of 35 mm or less, more than 35 m+n, 105 Ill less than iBf, and 105 a+to or more, respectively. In accordance with this program line, in the next step #86, the shutter speed Tv and aperture value Av are calculated from the exposure value EV. As a result, when the equivalent focal length becomes large, a higher shutter speed is set to prevent camera shake.

Step 87 (It is determined whether the shooting is cropping or not. If the shooting is not trimming, the process proceeds to step #90, but if the shooting is trimming, the process proceeds to step #88, and the cropping size is adjusted as shown in Table 2 below. Accordingly, the programmed aperture value Av is shifted to the open side by a predetermined amount, so that the depth of field when trimming approaches the depth of field when trimming is not performed.

Table 2 Trimming size Amount of shift toward open side Half size 1st step 1/4 size 2nd step FIG. 19 is a program diagram showing the relationship between the amount of shift of the aperture and the trimming size. Then, in step #89, the program-set shutter speed Tv is corrected in accordance with the shift amount of the aperture so that the exposure value Ev is maintained.

Then, according to the judgment in step #90, if it is not flash photography, the camera shake warning buzzer B is activated in step #9G.
The shutter speed for warning by Z is controlled according to Table 1 in the same manner as explained in the A mode, and then the process proceeds to step #95. On the other hand, if it is flash photography and charging is complete, step #91. In #92, set the shutter speed Tν to 1760 seconds and the aperture value Aν to F5.6.
After setting the value to , proceed to step #93. Step #93
It is determined whether the shooting is a trimming shot or not, and if the shooting is not a trimming shot, the process proceeds to step #95. However, if the shooting is a trimming shot, the process proceeds to step #94 again according to the number of trimming stages in the same manner as in the above step #88. Then shift the aperture to the open side and proceed to step #95.

In step #95, the aperture value and the preview aperture value are calculated, and the aperture value will be explained next.

A comparison will be made with a lens replaced with a lens having the same focal length as the equivalent focal length. Also, α is the same as a when used to explain the equivalent focal length.

Generally, the depth of field (only in front) is given by a"u2・δ・FBI2...■.

(r is the focal length of the i-shade lens, F is the aperture value) When the actual focal length is /α and the aperture is F, the depth is, from the above equations IF'/[2...■
The depth when trimmed to the equivalent focal length [/α is a'=
u2・αδ−F′/I2 = α・[12・F′/f2 ・・・■With F゛ as the aperture during trimming, the Brevini temporary depth is a”” Q 1112・δ−F′/f2=u2・δ・F
If you stop down to aperture FIIV, such as pv/f2, you can check the actual depth.

As a result, FIIV: αF゛ ... ■ Also, from the formula ■, ■, if the aperture is the same during trimming and when shooting with a lens of equivalent focal length, then from F = F', a, = α゛ (α〈1) ...■, and it can be seen that the depth at the time of trimming is deeper.

On the other hand, from the depth of field, the aperture F is al"a', but from the equations ■ and ■, F'=αF, so F=
F'/α ...■ On the other hand, if you try to obtain the expected depth with a lens of r/α corresponding to the equivalent focal length by reducing the depth of field during trimming, then the depth of field X=α2・u2・δ・
F'/12, and the depth Y when cropping with the aperture open from F' to F II is Y=
α・u2・δ・F″/“2.

From the relationship of X=Y, F゛=αF ... [phase],
All you have to do is narrow it down to F'' so that it satisfies Equation 0.

In this way, the depth during trimming becomes deeper, so the first
In the calculation routine shown in Figure 6, if the trimming size is half size, step #95-2
The value obtained by narrowing down the actual aperture value Aν calculated by one step is set as the aperture value, and if the trimming size is a quarter size, the actual aperture value Aν is calculated in step $95-5. The value obtained by narrowing down the value by two steps is taken as the calibration value. Also, if the trimming is half size, the actual aperture value Av is opened by one step in step #95-3, and if the trimming is quarter size, step #95-3 is performed.
At 95-6, the actual aperture value Av is opened by two steps.

This is because even if the aperture is the same, photos obtained by cropping will have shallower depth than photos taken in normal shooting mode, so depending on the operation of preview button 4,
The aperture value during preview is opened by a predetermined amount so that the confirmed depth is the same as the depth of the finished photo.

In the above embodiment, the aperture value at the preview time is opened in stages according to the trimming size, but if the trimming size changes continuously, the aperture value at the preview time is opened in stages. You may change it to Further, the aperture control means may be other than a motor.

[Effect of the Invention 1 According to the present invention, when the preview operation means for checking the depth of field is operated during cropping photography, if the cropping photography mode is selected, the aperture is set larger than when the normal photography mode is selected. Since the aperture is opened, the depth confirmed during preview corresponds to the depth in the finished photograph, thereby eliminating misperceptions of depth.

[Brief explanation of drawings]

Fig. 1 shows a camera bar 1 that can be used for cropping according to the present invention.
knτl? -Jiju strained demand outlet Front view of spout r↓spout 1 and 11 drops↓c1↓, Figure 3 is a side sectional view of Figure 1, Figure 4
The figure is a perspective view showing the back cover in Figure 2, and Figure 5 is a perspective view showing the back cover in Figure 2.
An enlarged view of the focusing plate in the figure, FIG. 6(a). (b) and (C) are diagrams showing display examples of the photographing information display section in Figure 5, PpI7 is an enlarged view of the display in Figure 1, and Figures 8 and 9 are the display in Figure 7. 10 is a block diagram showing an example of a control circuit applied to the camera capable of cropping shown in FIG. 1, and FIGS. 11 to 16 are block diagrams of the blocks in FIG. Flowchart showing the operation, Figures 17(a) and 17(b) are diagrams used to explain the equivalent focal length, Figures 18 and 1
FIG. 9 is a program diagram showing a program applied to the control block diagram of FIG. 10. 1... Trimming switching button, 2... Main switch, 3... Shutter release button, 4... Preview button, 5... Viewfinder, 6... Shutter speed up/down switch, 7... Accessories - shoe, 8
...Flash connector, 9...Metering mode off 1
) 8 Esui・inchi, 10... Squeezing down sui・
Sochi, 11... Shooting mode changeover switch, 12...
・・Lens lock button, 13・・Signal transmission pin, 14・
...Aperture return button, 15...Mirror, 1G...Reflector, 17...Prism, 18...Eyepiece, 19.
・Back cover, 20...Funecta for information transmission, LDI・
...Indicator, LD2... Focus plate, LEDI, LED2
... Light emitting diode, 100 ... Microcomputer, 101 ... Differential circuit, 102 ... AND circuit, 81 to S12 ... Switch, FC ... Flash control section, LM ... Photometry section, AC...Aperture control section, S
M...Stepping motor, SC...Mirror/shutter control unit, DS...Display control unit, BZ...Buzzer for camera shake warning, PC...Photography control unit, DX...
Code reading section, LN...lens. Patent Applicant Minolta Camera Co., Ltd. Agent Patent Attorney Seihaku Ao Gai 28 No. 161!1 Fig. 1 Fig. 2 Fig. 15 Mirror fjSB Fig. 6 III (010'5.6250 Aat-e Fig. 6 (b) EW Kumhaya Y1 Tokumura ---8 No. 61a
(C) Figure 7 f Figure 8 Figure 9

Claims (1)

[Claims] (1) A shooting mode selection means for selecting a normal shooting mode and a cropping shooting mode that allows specifying an area narrower than the area to be printed in the normal shooting mode, and checking the depth of field during actual shooting. and a control means for opening the aperture wider than when selecting the normal shooting mode when the preview operating means is operated when the trimming shooting mode is selected. A camera capable of cropping.