JPS62163032A - Camera capable of trimming photographing - Google Patents

Abstract

PURPOSE:To execute similarly various control with the same constitution without distinguishing them when a focal distance is changed by practically replacing lenses in accordance with equivalent focal distance by calculating the equivalent focal distance in accordance with the number of steps of trimming size. CONSTITUTION:A shutter speed on the higher side is set up to prevent manual vibration in case of increasing the equivalent focal distance, but in case of trimming photographing, a stop value Av set up by a program in accordance with the trimming size is shifted to the opening side by a prescribed value so that the depth of field at a trimmed case approaches that obtained at an untrimmed normal case, and a shutter speed Tv set up by a program in accordance with the shift value of the iris is corrected so that an exposure value Ev is held. In a case other than flash photographing, the shutter speed alarm by a manual vibration alarming buzzer BZ is controlled in accordance with the equivalent focal distance.

Description

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

[Prior Art and its Problems 1] To prevent camera shake, cameras are generally equipped with a device that automatically warns of camera shake when the shutter speed falls below a certain low speed. In this case, the shutter speed, which is the standard for camera shake warning, is set according to the focal length of the lens. Therefore, for cameras with interchangeable lenses, the focal length of the attached lens is automatically read, and the read focal length is used as the standard for the camera shake warning. Cameras in which the illumination angle is set according to the focal length of the lens have already been put into practical use.

In this way, a function that performs various controls depending on the focal length of the lens is also required in a camera that allows cropping photography. As disclosed in Japanese Patent Application Laid-Open No. 54-26721% and Japanese Utility Model Application No. 60-1.45728, this camera capable of cropping photography has information on the film that specifies an area narrower than the area to be photographed. By enlarging the designated area to a predetermined size when printing, it is possible to obtain photographs similar to those taken with a telephoto lens. In such a camera, even if the focal length of the lens itself is constant, the focal length will change equivalently depending on the magnification ratio during enlarging. It was necessary to change it accordingly.

[Object of the Invention] This invention has been made to eliminate the above-mentioned problems, and provides a camera capable of cropping photography, which controls the shutter speed, etc. for camera shake warning according to the cropping size when cropping photography is performed. The purpose is to provide

[Structure of the Invention] The camera capable of cropping photography according to the present invention has a cropping i-shadow mode that allows specifying an area narrower than the area to be printed in the normal photography mode, and a trimming size corresponding to the trimming photography mode V in the t-trimming photography mode. trimming size signal output means for outputting a signal; focal length signal output means for outputting a signal corresponding to the focal length of the attached lens; and an equivalent focal length calculation means that outputs a signal.

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

1 and 2 show the appearance of the single-lens 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 the size in the following order: → Half size without trimming (1/2) Landscape quarter size (1/4) Landscape half size Portrait Quarter size Portrait → There is one step to switch. 2 is a main switch of the camera, and when this main switch 2 is off, all operations as described below are prohibited. 3
2 is a shutter release button, and photometry is started by the first step of pressing the button 3, and the release operation is performed by the second step of pressing the button 3. 4 is a preview button,
Press this button 4.1. Full n sound tsu m ha 1 resistance 4 descendant Lu 11. ↓ Shimaki h1 上 21 ↓ It is now possible to know the depth of field at the time of actual shooting. 5 is 7 aing.

Reference numeral 6 is an up/down switch for changing the shutter speed (Tv). Each time 6 is pushed to the left, the shutter speed changes one step to the lower speed side. Reference numeral 7 designates an accessory shoe for attaching the flash device to the camera body, and reference numeral 8 designates 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 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 Av), and each time this switch 10 is pushed upward in FIG.
Each time you press the button, the aperture narrows down one stop.

11 is the shooting mode changeover switch, and this switch 1
Each time you press 1, each mode changes in the following order: → P (program) mode (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 rotate about one end thereof as a fulcrum. 16 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 lens provided at the rear of the pentaprism 17. LD 2 is semi-transparent mirror 1
It is a focusing plate consisting of an LCD provided in the optical path of the reflected light of 5. For example, one of the two glasses that make up the LCD is made into a matte surface to function as a focusing plate, and it can also be used to display shooting information in the viewfinder. can also be done at the same time.

Reference numeral 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 projecting hooded trimming information, equivalent focal length, etc. to be described later, on the side of the film screen, and when recording with a hood, it is converted into a numerical value at the time of printing and recorded on the print. 20 is the LED from the camera body.
1. This is a connector for transmitting information to the LED 2.

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

1) leldle indicates the display contents by LCD segments provided corresponding to the four corners of the image frame on the print obtained by cropping shooting. Light. For example, if you set /'%-fusabezu horizontal trimming, only segment a lights up and other segments) b, c, and d turn off, and when you trim a 1/4 size vertical (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 focuser speed is 1.
/250 seconds in P mode, and indicates completion of charging in flash mode.

FIGS. 6(a), (1)), and (c) show only 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 diagram of the LDI.

r+ is a segment for displaying the shooting mode, g is a segment for displaying film sensitivity, 11 is a segment for displaying shutter speed, and i is a segment for displaying trimming shooting. The characters are lit, and nothing is lit 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 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 respectively called the equivalent focal length and the equivalent focal length. 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 m is a segment for displaying the equivalent focal length during cropping photography.

n is a segment for displaying the trimming mode, when half size, l+alt is displayed, when quarter size, quarter is displayed, and at this time, either is displayed depending on whether it is horizontal or vertical. be done.

Figure 8 shows an example of LDI display, in A mode, film sensitivity /l5O400, no cropping, shutter speed 1/250 seconds, aperture value F5.6.
, indicates 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, for cropping photography, the shutter speed is 17125 seconds, the aperture value is F2.8, the focal length of the lens used is f-35n+n+, the calibration value is F4, and the equivalent focal length is f-50mm, indicating that the trimmed size is a vertically long half size. Therefore, if the print obtained by this cropping shooting is stretched to the size of the predetermined image frame in normal shooting, the aperture value will be the depth of field of F4, and a lens with a focal length of f = 50 mm will be used. It corresponds to when I was there.

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

Reference numeral 100 denotes a microcomputer consisting of a CPU (central processing circuit), in which signals from each switch as described below are input to an input port (Ix), and control signals are sent from an output port (Ox) to each device. Sent out. 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 that is linked to the trimming switch button 1, and S4 is a switch that is linked to the lens lock button 12, and is used when the lens is attached and when the lens is removed.
It is a switch that turns on once when removed. S5 has back cover 1
S6 is a switch that is turned on when the back cover 19 is touched, 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 that is linked to the shutter speed up/down switch 6, and when the shutter speed is set to the high speed side, the switch 5IO-1 is turned on, and conversely, when the shutter speed is set to the low speed side, the switch 5IO-2 is turned on. become.

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 switch Sl 1-2 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 h microcomputer 10.
0's input boats 11 to I+1 are input manually. These input ports ■, ~I14 are each pulled up to "H" by a resistor R connected to a positive voltage at one end, and by closing each switch 81~S12, each manual boat ■1~■ 1 becomes “Ln.

Also, each input boat L~■4 directly connects one input boat ■
, respectively through the differentiating circuit 101.
The input part 1 of the i1 path 102 is connected, and this AND circuit 1
The output section of 02 is connected to the interrupt terminal lNTl of the microcomputer 100. and input port I 14
and an interrupt terminal INT2 of the microcomputer 100 are connected. When the input signal to the interrupt terminal lNTl changes from "H" to "L", an interrupt is applied to the microcomputer 100. Therefore, when any of the switches 81 to S4 is turned on, or when the switch S5 is turned on or off, the differentiating circuit 1
The AND circuit 102 is turned on by the output signal from 01, and an interrupt is generated by the interrupt terminal lNTl.

Also, the interrupt terminal INT2 has a human input signal from Lll to H.
An interrupt is generated when the number changes to 11.

FC is a flash control unit connected to the flash device via the flash connector 8, and has an output port.
) Information such as the equivalent focal length for switching light distribution characteristics, trimming mode, shooting aperture value and film sensitivity for interlocking distance display and guide number control are input via Ofc, and charging is performed from this Franche control unit FC. A completion signal is input to the input tote II5 and the photometer LM. The photometer LM measures the brightness Bv of the subject, and has an output capo of 0. ．． A signal indicating whether it is average photometry or spot photometry and a photometry permission signal are input from 02,
The photometric data is input to the input boat Iρm. or,
A stop signal for stopping flash emission is sent from the photometry section LM to the flash control section FC. This allows light metering to start at the same time as the flash fires.
When the photometric amount 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 an output capacitor (Oac). When the aperture operation by the stepping motor SM stops, the aperture controller AC controls the human-powered boat 11.
6, an aperture stop signal is sent. SC is a mirror/shutter control unit, and output signals 0=, O=, and Os control the release signal and the shutter front curtain and rear curtain.
c and 2c are respectively input, and the mirror/shutter control unit SC sends a mirror-up completion signal to inform the input capo (I) that the mirror 15 has rotated upward, and a flash control signal. A flash light emission signal for activating the flash device is sent to the 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 output capo (opc) to the light emitting diode LED1. L.E.
This is an imprint control unit 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, maximum aperture value, minimum aperture value, etc. are sent to the input lens LN.

Next, the operation of the control circuit will be explained according to a flowchart.

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

As described above, when an interrupt is applied to the divider 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 executed in step #1. Side terminal lNTl
Interrupts are prohibited. This is because 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 divided terminal lNTl is canceled, and the process proceeds to step #13. Then, unnecessary tarok in the microcomputer 100 is stopped and a standby state is entered in which power consumption is minimized. On the other hand, if main switch 2 is on, switch 5 is turned on in step #3.
IJl(+'/1-fp-(11LJ1%ron4-:,
-, , Ay-+, I+- It is determined whether the button 3 is pushed to the first stage. If it is pushed in, the process proceeds to the photometry routine described later, and if it is not pushed in, step #4
Proceed to. In step #4, the state of the switch S2, that is, whether the mode switching button 11 is pressed is determined. If it is pressed, the process proceeds to step #16, and after the photographing mode Y 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, and it is determined whether the state of the switch S4, that is, 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 advances to step #6, and it is determined whether switch S5, that is, back cover 19 is opened.

If the back cover 19 is opened due to film replacement, proceed to step #15, reset the trimming mode, and proceed to step #10, but if the back cover 19 is not opened or closed and is closed, step #15 will proceed. Proceed to #7. 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 for each trimming change button 1 as described above. It is possible to switch sequentially, and then proceed to step #10.

On the other hand, if trimming switch button 1 is not pressed, the process proceeds to step #8, where the film sensitivity is read by the code reading section DX, and in the next step #9, the film sensitivity setting is adjusted based on the read film sensitivity. Changes are made. In step #10, the above settings are displayed on the display LDI. After that, in step #11,
The outputs of each output capacitor (Ox) of the microcomputer 100 are reset, and in step #12, the interrupt prohibition of the interrupt terminal 1NTl is canceled.The process then proceeds to step #13, where the microcomputer 100 enters a 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 I
NT2 changes from "L" to "I" and an interrupt occurs. When the second interrupt occurs, all interrupts (1) are prohibited in step #57 to prevent this routine from being interrupted midway by the interrupt. Reset each output port ○X in step well 58, and step #5
to reset the cropping mode and return to normal shooting mode.

Moreover, when the main switch 2 turns off,
As mentioned above, when you turn on the lens lock button 12 to attach or detach the lens or to change the film,
When it is clearly necessary to return to the normal shooting mode, such as when the camera 9 is opened or closed, the single trimming mode is automatically reset to return to the normal shooting mode. This prevents failures in shooting due to forgetting to cancel trimming mode.

In step #60, data for standby display is sent to the display control unit DS, and in step #61, data for the display device LDI is sent.
The standby display is displayed.

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

Interruption to INT2 is permitted, and the standby state is entered in step #63. Note that when the main switch 2 is off, the camera does not operate as described above.

FIG. 13 shows a 70-chart 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.
It is determined whether the trimming mode is set by , and if the trimming mode is set, step #2
The process proceeds to step #1, where spot photometry is set for the microcomputer 100, and the process proceeds to step #22.

In this manner, during cropping photography, the photometry is performed on the area outside the trimming frame, which is related to the setting state of the photometry mode changeover switch 9. On the other hand, if the trimming mode V is not set, the mode set by the photometry mode changeover switch 9 is determined in step #1, and the trimming mode V is set.

If it is set to the negative photometry side, spot photometry is set in step #21, whereas if it is set to the average photometry side, average photometry is set in the microcomputer 100 in step #20. 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 in an equivalent focal length calculation routine to be described later. At the next step #24, switch 5IO-1, 2, switch 511-1.
2, that is, the shutter speed (Tv) and aperture (AV) set by the shutter speed up/down switch 6 and the aperture up/down switch 10 are taken in. At step #25, Suin, /″In, r, J+−#l=++
I-ITIW knee-+? -1・Ql-1'L shadow mode,
Trimming mode, lens LN attachment status, back cover 19
Information on the open/closed status of the is imported.

At step #26, when the photometry value by the photometer LM is input to the input capo (Ipm), at step #27,
Based on the photometric value, an exposure calculation routine to be described later calculates the shutter speed Tv+aperture value Av, and also calculates the aperture value. These calculation results and the equivalent focal length are displayed on the display device LDI at 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 #29, flash information such as the equivalent focal length is sent from the output port Ofc 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,
The state of the switch S7, that is, the preview type 4, is determined, and if this button 4 is pressed, the preview aperture value is calculated from the photometric value in the calculation routine in step #31. By sending the signal from Oac to the aperture control unit AC, the stepping motor operates and the lens LN
is narrowed down to a predetermined aperture value. On the other hand, preview type 4
When is not pressed, in step #32, the open aperture value of the lens is sent to the aperture control unit AC, and the lens L
Keep the N aperture open and proceed to step #33. At step #33, the first button of shutter release button 3 is pressed.
The state of the photometry switch S1 that is turned on in step # is determined, and if this switch S1 is turned on, step #
The process proceeds to step #35, where the power hold timer is reset, and the process proceeds to the next step #38.

Therefore, when the photometry switch S1 is on, the power is held by resetting the hold timer. If the switch S1 is off, step #
34, the power hold timer determines whether a predetermined time has elapsed (over 70-), and
- If so, the output port XX is reset in step #36, and an interrupt to the interrupt terminal lNTl is permitted in step I37, and then the process proceeds to step #56, where the standby state is entered. On the other hand, if there is no overflow in step #34, the process advances to step #38, and the switch S
9 is on or off, that is, it is determined whether there is a release operation of the shutter release button 3 or whether film winding is completed, and the shutter release button 3 is operated so as not to release when the film winding is not completed. Regardless, the process returns to step #18 and repeats the above process.

On the other hand, if the winding of the film has been completed, the process advances to step well 39, where it is determined whether the switch S6, that is, the shutter release button 3, has been pushed to the second stage.If it has not been pushed in, the process advances to step well 18. Return and repeat the above process, but if the shutter release button 3 has been pushed to the second stage, proceed to the next step #40. When the photometry by the photometer LM is prohibited in step #4o, the signals for the buzzer BZ and the like are reset in preparation 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 #
At 42, the aperture of the lens LN is narrowed down by sending the photographing aperture value to the aperture control unit AC.

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.

Step 7 #↓Whether the narrowing down operation and the raising of the mirror 15 are completed in 5 and #46 is 1! Once the decision has been made and each operation is completed, the process proceeds to the next step #47. In step #47, the photometry mode is switched to average photometry for flash dimming. Then, at the step well 48, the signal 1c is sent from the output port 04 to the mirror/shutter control unit SC, so that the shutter front curtain starts and exposure starts.At the same time, at step #4, the microcomputer 100 The timer is activated to count the shutter speed time, and when the count is complete,
At step #50, a signal 2C is sent from the output capacitor Os to the control section SC, whereby 1) the shutter trailing curtain starts and the exposure stops.

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 flash control section FC, and the flash device emits light. The flash light reflected by the subject is transmitted to the photometer L.
It is integrated by M, and if this integral value becomes a predetermined value,
A stop signal is sent from the photometry section LM to the 7-lash control section FC, and the flash light emission is stopped. 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. vinegar·
In step #52, information for displaying the standby state by turning off the shutter speed and aperture value displayed on the display LD1 is created, and this information is used in the display LD1 in step #53. Displayed on LDI. Thereafter, in step #54, the output port 0x is reset, and in step I55, an interrupt to the interrupt terminal 1NTl is permitted, and then the process proceeds to step #56, and enters 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 aT. Consider the case of trimming like this.

There is a relationship tanω=T/f r tar+ω'=αT/f, and FIG. 17(b) shows the relationship when the image height of aT obtained by trimming is extended to T, is the equivalent focal length.

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

As a result, for example, when the focal length f is 35 mm and the image height is trimmed to 172, in this case, α
= 1/2, and the equivalent focal length is 35/(1/2) = 7
0+am, and the trimming size is 1/4. Also, if the trimming is half size α
The value of is 1/2.

Therefore, as shown in the equivalent focal length calculation routine in FIG. 14, if half-size trimming is performed, step #2
In 3-2, the value that doubles the focal length of the lens is the equivalent focal length, and if it is 1/4 size, step #
23-4, the value obtained by doubling the focal length of the lens becomes the equivalent 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 input from the photometer LM and the film sensitivity Sv input from the hood reader DX. (Ev=
(Bv10Sv) Then, at the Stellar well 65, the state of the preview button 4 is determined. Preview 111J+I,
l-′! tI+frost) always' W Jet box trena 21
This is not performed in the small routine, but only the calculation of the correction value and preview aperture is performed in step #95 in case the correction value or preview aperture value is changed due to a change in the trimming mode during shooting. Do the following.

On the other hand, if it is not a preview operation, step #66;
#67, I681 The trowel photographing mode is determined.

If it is the 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. Then, as determined in step #71, if it is flash photography and charging has been completed, the shutter speed Tv is held down in step #72 so that the shutter speed Tv is synchronized with the light emission of the flash. After that, proceed to step well 95.

On the other hand, if you are in S (shutter speed priority) mode, proceed to step #68 and step #73, and then edit the manual. , Dah Gokko T. The aperture value Av is calculated from the above Ev value and Tv value in the next step 74. and f' in step #75
Due to l + constant, if it is not flash photography, step #
The process proceeds to step #95, but if it is flash photography and charging is completed, the shutter speed is held down in step #76 so that the shutter speed Tv is synchronized with the light emission of the flash. After setting the aperture value Av to F5.6 in step #77, it is determined in step #781 whether trimming shooting is to be performed, and if it is trimming shooting, the aperture is set to the open side according to the number of trimming steps in step #79. Shift to , but if you are not shooting with cropping, step #9
Proceed to step 5.

If the A (aperture priority) mode is selected, the process proceeds from step #67 to step #80, where the aperture value set manually is set to A.
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 1760 seconds in step #83, and then the process proceeds to step #95.

On the other hand, the first case without flash photography is Kutep #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+nm
Below 1/30 seconds 35mm-105mm
l/60 seconds 105mm or more 1/l
oo seconds This means that for cameras that have been cropped and have increased the magnification when printing to achieve the same effect as shooting with a long focal length lens, it is meaningless to determine the camera shake warning based solely on the focal length of the lens. Therefore, the camera shake warning shutter speed is set according to the equivalent focal length as shown in the table above.

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 n+m or less, more than 35 n++o, less than 105 mti, and 105 mm 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.

In step #87, it is determined whether or not the shooting is cropping, and 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, as a result of the determination in step #90, if it is not 7-lash shooting, the camera shake warning buzzer B is activated in step #96.
The shutter speed for raising the Z alarm is controlled in accordance with 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 Av to F5.6.
After setting it to , proceed 931 steps to Stempwell. Step #9
3 (In step 2, it is determined whether or not it is a cropped photograph. If it is not a cropped photograph, the process proceeds to step 95. However, in the case of a cropped photograph, in step #94, the process is again performed according to the number of trimming steps in the same manner as in step #88 above. Shift the aperture to the open side and proceed to step #95.

In the step well 95, an aperture value and a 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. Further, α is the same value as used in explaining the equivalent focal length.

Generally, the depth of field (only in front) is given by a=u2・δ・F/f2...■.

(r is the focal length of the photographic lens, F is the aperture value) When the actual focal length is r/α and the aperture is F, the depth is, from the above formulas ■ and ■, a+ "" C12* u 2・δ-F /[2-...■
The depth when trimmed to the equivalent focal length r/α is a'=
u2*αδ-F'/f2 = α・u2・F'/f2... ■With F'' as the aperture during trimming, the depth at preview time is H'=a, 12*δ・F'/[2= The actual depth can be confirmed by narrowing down the aperture to Fpv as shown in = u2・δ・Fpv/r2.

As a result, Fpv=αF' ...■ Also, from the formulas ■ and ■, if the aperture is the same during trimming and when shooting with a lens of equivalent focal length, then from F=F', a, = α゛ (αku1) ・・・■, which shows that the depth at the time of trimming is deeper.

On the other hand, since the aperture F as seen from the depth of field is al"a', from the equations ■ and ■, F'=αF, so p
: F l / a... ■On the other hand, if you try to reduce the depth during trimming to obtain the expected depth with a lens of f/α corresponding to the equivalent focal length, the depth X at that time will be calculated from formula 0. , X=a2・u2・δ・F゛/f2, and the depth Y when the aperture is opened from F'' to F'' and cropped is taken from formula 0, Y=α・u2・δ・F''/ f
It becomes 2.

From the relationship of X=Y, F''=αF... [phase],
[Phase] It is only necessary to narrow it down to F″ so as to satisfy the equation.

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
If the actual aperture value QAv calculated by the calculation is narrowed down by one step is set as the aperture value, and if the trimming size is a quarter size, the actual aperture value Aν is determined in step #95-5. The value obtained by narrowing down the value by two steps is taken as the calibration value. 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, the actual aperture value l\V is opened in step #95-6. is opened in two stages. This is because even if the aperture is the same, a photo obtained by cropping will have a shallower depth of field than a photo taken in normal shooting mode, so by operating preview button 4, you can check the aperture value at the moment of previewing. It opens only a predetermined amount.

As explained above, the equivalent focal length is calculated according to the number of trimming size steps, and the shutter speed that outputs the camera shake warning is changed based on this equivalent focal length. When the distance becomes large, the shutter speed for camera shake warning is switched to a high speed side to set an appropriate value, and when this equivalent focal length becomes large, the shutter speed is set to a higher speed side. The program has been changed to prevent camera shake. Furthermore, by sending information on the equivalent focal length to the flash device, the light distribution characteristics of the flash device are also changed.

In this way, when the equivalent focal length changes, various controls can be implemented with the same configuration without distinguishing between the two, in the same way as when the focal length is actually changed by exchanging lenses.

In the above embodiment, the equivalent focal length is calculated by multiplying the focal length of the attached lens by the coefficient of the trimming size.
In order to cover a wide range of focal lengths, the equivalent focal length may be calculated by using a logarithmic compression system and adding the logarithmically compressed values. This equivalent focal length can be used to switch the focus detection accuracy/range and lens drive accuracy, to be imprinted on film as photographic data, or to be stored in the storage means of the pond.

Furthermore, although the present invention is assumed to be a camera with an interchangeable lens, it can also be applied to a camera with a fixed lens.

[Effect of the invention 1 According to the invention, since the equivalent focal length is calculated according to the number of steps of the trimming size, it is possible to calculate various focal lengths according to the equivalent focal length in the same way as when the focal length is actually changed by exchanging lenses. Control can be realized with the same configuration without distinguishing between the two.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of a camera capable of cropping photography according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG.
4 is a perspective view showing the back cover in FIG. 2, FIG. 5 is an enlarged view of the focus plate in FIG. 3, and FIG. 6(a). (b) and (C) are diagrams showing display examples of the photographing information display section in FIG. 5; FIG. 7 is an enlarged view of the display in FIG. 1;
8 and 9 are diagrams showing display examples on the display unit of FIG. 7, and FIG. 10 is a block diagram showing one embodiment of a control circuit applied to the camera capable of cropping photography shown in FIG. 11 to 16 are flowcharts showing the operation of the blocks in FIG. 10, FIGS. 17(a) and 17(b) are diagrams used to explain the equivalent focal length, and FIGS. 10 is a program diagram showing a program applied to the control block diagram of FIG. 10. FIG. 1...Trimming switching button, 2...Main switch, 3...Shutter release button, 4...Preview button, 5...Viewfinder, 6...Shutter speed up inch, 7... Accessories - Shoe, end...Flash connector, 9...Metering mode changeover switch, 10...Aperture up/down switch, 1
1...#Q shadow mode changeover switch, 12...lens lock button, 13...signal transmission bin, 14...aperture return button, 15...mirror, 16...reflector, 17
... Prism, 18... Eyepiece, 19... Back cover, 20... Information transmission connector, LDI... Display, LD2... Focus plate, LEDI, LED2...
Light emitting diode, 100... microcomputer,
101... Differential circuit, 102... AND circuit, 81
~S12...Switch, FC...Flash control section, LM...Photometering section, AC...Aperture control section, SM...
・Stepping motor, SC...mirror/shutter control unit, DS...display control unit, BZ...shake warning buzzer, PC...imaging control unit, DX...code reading unit, LN... ··lens. Patent Applicant: Minolta Camera Co., Ltd. Agent Patent Attorney: Blue and White, 2 others Page 16, Figure 1, Figure 2, 15 Mirror, Figure 6 (b) [Efuiku=]Ma)-8 Figure 9

Claims (4)

[Claims] (1) Trimming shooting mode that allows you to specify an area narrower than the area printed in normal shooting mode;
a trimming size signal output means for outputting a signal corresponding to a trimming size in the trimming shooting mode; a focal length signal outputting means for outputting a signal corresponding to a focal length of an attached lens; and the focal length signal and the trimming size signal. and equivalent focal length calculation means for outputting a signal equivalently corresponding to the focal length from the camera. (2) The camera capable of cropping photography according to claim 1, further comprising means for receiving a signal from the equivalent focal length calculating means and changing a program for setting a shutter speed, etc. from a photometric value. (3) The camera capable of cropping photography according to claim 1, further comprising means for changing a shutter speed for outputting a camera shake warning in response to a signal from the equivalent focal length calculating means. (4) The camera capable of cropping photography according to claim 1, wherein the signal from the equivalent focal length calculation means is sent to a flash device.