JPS62163035A - Camera capable of trimming - Google Patents

Abstract

PURPOSE:To easily detect a telephotographic effect of a print obtained by trimming or the depth of field by displaying an equivalent focal distance or an equivalent stop value on a display means in accordance with trimming size. CONSTITUTION:In an equivalent focal distance calculating routine, an equivalent focal distance is calculated on the basis of a focal distance of a lens and trimming size, a shutter speed Tv and a stop value Av are inputted and information such as a photographing mode, a trimming mode, the loading state of a lens LN, and the opening/closing state of a back cover 19 is inputted. When a photometric value based upon a photometric part LM is inputted to an input port Ilm, an exposure calculating routine calculates the shutter speed Tv and the stop value Av on the basis of the photometric value and calculates also the equivalent stop value. These calculated results and the equivalent focal distance are displayed on a display unit LD1.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] This invention is a camera that enables cropping shooting [Prior art and its problems] In addition to the normal shooting mode that prints the entire shooting screen area, A camera capable of so-called trimming i-shadow, which was able to record information on the film to specify printing in a narrow area, was developed in Japanese Patent Application Laid-Open No. 1973-
26721 and Japanese Utility Model Application Publication No. 60-145728, by enlarging the specified portion to a predetermined size at the time of printing, it is possible to focus on the same number of nights as the outside when photographed using a telephoto lens. You can change the distance and aperture value.

Therefore, for photographers who are accustomed to taking shots that take into account the effects of the focal length and aperture [ ) value, which change due to changing lenses or zooming with a zoom lens, it is useful to use the equivalent focal length to understand the telephoto effect, etc. It is necessary to know the distance and equivalent aperture value, but to do this, conventionally it was necessary to calculate the equivalent focal length and equivalent aperture value from the focal length of the lens attached and the cropping magnification. This was particularly noticeable in some cases.

[Objective of the Invention 1] This invention has been made to eliminate the above-mentioned problems, and in order to easily know the telephoto effect or depth of field during cropping photography, 1. Alternatively, it is an object of the present invention to provide a camera capable of taking pictures with trimming that is displayed as an equivalent aperture) value.

[Structure of the Invention I & l The camera capable of cropping photography of the present invention has a cropping photography mode that allows specifying an area narrower than the area that is normally printed in the i-motion mode, and outputs a signal corresponding to the trimming size in the trimming photography mode. a cropping size signal output means for outputting at least one of the focal length or photographing aperture value of an attached lens as an information signal; It is characterized by comprising a calculation means for calculating an equivalent focal length or an equivalent aperture value based on a signal, and a display means for displaying information from the calculation means.

[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.

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 in the following order: → Half size without trimming / 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. 4t is a preview button, and while this button 4 is pressed, the aperture value is stopped down to the actual shooting aperture value, so that it is possible to know the field of view at the time of actual shooting. 5 is a finder.

6 is an up/down switch for changing the shutter speed (Tv), and as shown in FIG. Each time you press - to the left, the shutter speed changes one step to the lower speed side. 8 is an accessory shoe for attaching the flash device to the accessory shoe 7 and a connector for exchanging information between the flash device and the camera body. .

Reference numeral 9 denotes a switch for switching the photometry mode, which switches between average photometry, which measures the entire photographic screen, and subont photometry, which measures only a predetermined narrow area. 1 ( ) is for changing the aperture value (
Each time you press down, the aperture is narrowed down one step at a time.

Reference numeral 11 denotes a JII shadow mode changeover switch, and each time the switch 11 is pressed, each mode changes in the following order: →P (program), mode (aperture priority), M (manual) mode, S (shutter speed priority) mode →. Reference numeral 12 is a lens lock button for fixing the lens to the camera body, and reference numeral 13 is a signal transmission pin for transmitting information from the lens to the camera body. 14 is an aperture return lever, and by operating this lever 14, the camera controls the aperture of the lens. The LDI is a liquid crystal display (LCD) that displays shooting + RT information.

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

1 to 11111 t, while stone 1 as 11f
It's a good looking car; it's a mirror of Shuuzu. 16 is a reflecting plate for guiding the subject light transmitted through the mirror 15 to the light receiving element PD; 17 is a pentaprism for guiding the reflected light from the semi-transparent mirror 15 to the pointing 5; and 18
is an eyepiece provided behind the pentaprism 17. LD2 is a focusing plate provided in the optical path of the reflected light from the semi-transparent mirror 15 and consisting of an LCD.
By making one of the two glasses that make up the camera a matte surface, it can be used as a focus plate, and photographing information can also be displayed in the viewfinder 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 that are used to project coded trimming information, equivalent focal length, etc. (described later) on the side of the film screen, and when recorded with a hood, they are converted into numerical values and recorded on the print at the time of printing. 20 is the LED from the camera body.
1. This is a connector for transmitting information to LED2.

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

b, c, d, and e are provided corresponding to the four corners of the image frame on the print obtained by cropping and show the display contents of the LCD segments, and depending on the trimming mode setting, either a or d segment lights up. For example, when trimming a half size horizontally, only segment a lights up and other segments b, c, and d turn off, and when trimming a quarter size vertically, only segment c) lights up. e indicates the shooting information displayed at the bottom of the focus plate LD2,
From the left end, the aperture is F5.6 and the shutter speed is 17250.
seconds, P mode, and I indicates charging completion in flash mode.

Figures 6(a), (b), and (c) show only the photographing information display section e, and are respectively A mode and M mode.
mode, S mode is selected.

FIG. 7 shows a detailed diagram of the LDI.

" is a segment for displaying the shooting mode, g is a segment for displaying film sensitivity, h is a segment for displaying shutter speed, and i is a segment for displaying trimming shooting. During trimming shooting, the letters TRIMMINING are lit. Nothing lights up during normal shooting.j is the aperture display segment, and k is the equivalent aperture display segment, which is displayed only during cropping shooting.This equivalent aperture and the above-mentioned equivalent focal length are used without trimming. By using a telephoto lens, etc., it is possible to obtain the same depth in the same image frame as the print obtained by cropping photography, and at this time, the focal length and aperture of the telephoto lens, etc., are equivalent focal length and aperture, respectively. This is why we call it the equivalent aperture.By knowing this equivalent focal length or equivalent focal length, you can easily recognize the telephoto effect and depth in prints obtained by cropping photography.

i! 1. The segment for displaying the focal length of the photographing lens, I
n is a segment for displaying equivalent focal length during cropping photography. The mouth is a segment for displaying the trimming mode, and when it is half size, half is displayed, and when it is quarter size, quarter is displayed. +h
10#-tT+ &'k l-t! lr IX f”
L

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''135m+n.

Also, in Figure 9, in M mode, the film sensitivity is Is○2.
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 f = 35m + n, and the equivalent aperture value is F
4. The equivalent focal length is r=50+pass, which indicates that the trimming size is a vertically long half size. Therefore, if the print obtained by this cropping shooting is enlarged to the size of the predetermined image frame in normal shooting, the depth of field is the aperture value or F4, and the focal length is r = 50 + nn + using a lens. Sometimes equivalent.

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

1001 is a microcomputer consisting of a tCPU (central processing circuit), and signals from each switch as described below are input to the input capo (Ix), and control signals are sent from the output capo (Ox) to each device. be done. Sl
S2 is a switch that is turned on by pressing the shutter release button 3 in the first step, and S2 is a shooting mode switching button 11.
This is a switch that turns on when 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 turned on when the lens is attached or removed. S5 is Ura Yota 1
S6 is a switch that is linked to shutter release button 3 and turns on when Ura Yota 19 is heard.
This is a switch that is turned on by pressing in the second step.

S7 is a switch that is turned on in conjunction with the Brevigny type 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. S 10-1 , S
10-2 is a switch linked to the shutter speed up/down switch 6, and when the shutter speed is set to the high speed side, the switch 510-1 is turned on (I), and conversely, when the shutter speed is set to the low speed side, the switch S10-2 is turned on. is on 1.

5ll-1 and 5ll-2 are aperture up/down switch 1
It is a switch linked to 0, and the aperture is set to the open side.
The switch 5it-1 is turned on, and conversely, the switch 511-2 is turned on when set to the narrowing down side.

S12 is a switch linked to the main switch 2.

One of each of the switches 5x-Lss2 is grounded, and the Ikegata terminal is connected to the micro combinator 1.
It is input to input ports i, -I, and 4 of 00. These input ports 11 to 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 to S12,
Each input port 11-11 becomes "L".

In addition, each input port ■, ~I4 is connected directly to the input part of an AND circuit 102, while input port I is connected to the input part of an AND circuit 102 via a differentiating circuit 101, and the output part of this AND circuit 102 is connected to an interrupt of the microcomputer 100. Terminal lN
Connected to Tl. Then, the human powered boat I14 and the interrupt terminal INT2 of the microcomputer 100 are connected. The input signal to this interrupt terminal lNTl is “H”
When the microcomputer 10 changes from
0 is set to receive an interrupt. Therefore, when any of the switches 81 to S4 is turned on, or when the switch S5 is turned on or off, the output signal from the differentiating circuit 101 turns on the AND circuit 102, goes to the interrupt terminal lNTl, and generates an interrupt. It takes. Further, the interrupt terminal INT2 is configured to generate an interrupt when the input signal changes from "L" to "H".

FC is a flash control unit that is connected to the flash device via the 7 runshot connector 8, and displays the switching distance of light distribution characteristics and the i-shadow aperture value for guide number control via the output port ○fc. Information such as film sensitivity is input, and a charge completion signal is input from the flash control section FC to the input port I19 and the photometry section LM.

The photometry unit LM measures the brightness Bv of the subject,
Out capo) 0. ．． A signal indicating whether it is average photometry or spot photometry and a photometry permission signal are input from 02, and the photometry data is input to input port T (1m). A stop signal is sent to the FC to stop the flash emission.As a result, photometry is started at the same time as the flash emission, and when the amount of photometry reaches a predetermined amount, a stop signal is sent to stop the flash device from emitting light. There is.

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 Oac. When the aperture operation by the stepping motor SM stops, input power is input from the aperture control section AC.1.
6, the aperture stop signal is sent out to the output tote ○1. ○1. A release signal and signals 1c and 2c for controlling the front and rear curtains of the shutter are inputted from O1, respectively, and from this mirror/shutter control unit SC, an input boat 117 is inputted.
A mirror up completion signal indicating that the mirror 15 has rotated upward and a 7-lash light emission signal for activating the flash device are sent 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 port 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 output port 07. DX is input by reading the code indicating the film speed shown on the film cartridge.
dx, LN is a lens, and the focal length, open aperture value, minimum aperture value, etc. are sent from this lens LN to the input lens r11n.

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

The 70-chart 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 one of the switches 81 to S4 being turned on or the switch S5 being turned on or off, step #1 is executed. Terminal lN
Interrupts to Tl 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 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 #4, 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, 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 proceeds to step #6, and it is determined whether the switch S5, that is, the back cover 19 is opened.

When the film is replaced, the back cover 19 is opened to reset the first door and proceed to step #10, but if the back cover 19 is not opened or closed and is closed, the screen proceeds to step #7.

In step #7, the state of the switch S3, that is, the trimming switching button 1 is determined, and if this button 1 is pressed, the process proceeds to step #14, and as described, this button 1 is pressed.
The trimming size is sequentially switched each time the button is pressed, and the process then proceeds to step #10.

On the other hand, if the trimming switch button 1 is not pressed, the process advances to step #8, where the film sensitivity is read by the hood reader 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 the microcomputer 100 (respective output ports) Ox are reset, and in step #12, the interrupt prohibition of the interrupt terminal lNTl is canceled, and the step and knob #13 are reset.
Then, the microcomputer 100 enters the first step (E It-f11). FIG. 12 is a routine showing an interrupt to the interrupt terminal INT2.

When main switch 2 turns from on to off, terminal TN
T2 generates an interrupt from "°L" to l(゛tona【). When this interrupt occurs, all interrupts are prohibited at step I57, and this routine is interrupted midway due to the interrupt from Ike. This is done so that it will not be interrupted.In step #58, each output port ○× is reset, and in step #5
to reset the cropping mode and return to normal shooting mode.

When the main switch 2 is turned off in this way, or as mentioned above, the lens lock button 1 is pressed to attach or detach the lens.
When turning on 2 or changing the film, the back side
When it is clearly necessary to return to normal shooting mode, such as when opening or closing the camera, the trimming mode is automatically reset and the camera returns to normal shooting mode. This prevents i-shadow failures due to forgetting to cancel the trimming mode.

At step #60, data for standby display is sent to the display control unit DS, and at step #61, the standby display is displayed on the display LD1.

Then, at the step well 62, the interrupt terminal INT1
.

Interruption to INT2 is permitted, and the standby state is entered in step #63. Incidentally, 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, photometry is started by sending a photometry permission signal from the output boat 02 to the photometry section LM. At step #18, press the trimming size switching button 1.
It is determined whether the trimming mode is set by t, and if the trimming mode is set, step #
The process proceeds to step #21, where spot photometry is set for the micrometer computer 100, and the process proceeds to step #22.

In this way, when shooting with cropping, you can turn off the metering mode.
) Irrespective of the setting status of the changeover switch 9, the camera is forcibly switched to spot photometry, and the area outside the trimming frame is not photometered. 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, step #21 is performed.
Spot photometry is set in step #20, and if average photometry is set, average photometry is set in the microcomputer 100 in step #20. Next step #22
At , 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 using 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 up/down switch 6 and the aperture rear knob down switch (V) are incorporated. 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.

At step #26, when the photometry value from the photometer LM is input to the input capo ILn, at step #27,
Based on the photometric value, the shutter speed Tv and the aperture value Av are adjusted and the equivalent aperture value is computed by an exposure calculation routine to be described later. These calculation results and the equivalent focal length are displayed in step #28.
Display on D1.

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

In the next step #29, in order to change the light distribution characteristics for the output boat 1) flash control unit FC,
Seven runs of information such as equivalent focal length etc. are sent out. As a result, the lens on the light emitting part surface is
Ding t, i, 1. sIl, LIR16F (6f-rm-27-'-uJ, +' is possible. At step #30, the state of the switch S7, that is, the preview button 4 is determined, and if this button 4 is pressed, step # At step 31, the preview aperture value calculated from the photometric value in the calculation routine is sent from the output capo (Oac) to the aperture control unit AC, and the stepping motor is activated and the lens LN is set to the predetermined aperture value. Narrowed down. On the other hand, if the preview button 4 is not pressed, in step #32, the aperture control section A
The open aperture value of the lens is sent to C, the aperture of the lens LN is kept open, and the process proceeds to step #33. In step #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 activated. It is reset and 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 #
At step 34, the power supply hold timer determines whether a predetermined period of time has elapsed (over 70-), and if it overflows, the output power is reset to 0 at step #36, and at step #37. After allowing an interrupt to the interrupt terminal NT1, the process proceeds to step #5G and enters a standby state. On the other hand, over 70 at step #34
- If not, it is determined whether the switch S9 is on or off, that is, there is a release operation of the shutter release button 3, or whether the film winding is completed, and the film winding is completed. Regardless of the operation of the shutter release button 3, the above step #1 will not be released if the shutter release button 3 is not completed.
Return to step 8 and repeat the above process.

On the other hand, if the film winding has been completed, the process advances to step #3, and it is determined that the switch S6.1111 release button 3 has been pushed to the second stage, and it is determined that it has not been pushed in. If the shutter release button 3 has been pressed to the second stage, the process returns to step #18 and repeats the above process, but if the shutter release button 3 has been pushed to the second 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.
In step #42, the aperture 1) of the lens LN is adjusted by sending the photographing aperture value to the aperture control unit AC.

In the next step #43, the output port 0. A release signal is sent from the mirror shutter controller SC to rotate the mirror 15 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 have been completed, and if each operation has been completed, the process proceeds to the next step #47. In step #47, a signal IC is sent from the output capo (Ol) to the mirror/shutter control unit SC in the metering mode 48 for flash light adjustment, thereby starting the shutter front curtain and starting exposure. At the same time as the start, at step #49, a timer in the microcomputer 100 operates to count the shutter speed time, and when the count is completed, at step #50, the signal 2 is output from the output port O3.
C is sent to the control unit SC, thereby starting the shutter trailing curtain and stopping the exposure.

Also, when the shutter front curtain opens tightly, the mirror
A flash light emission signal is sent from the shutter control section SC to the 7-lens shutter control section FC, and the flash device emits light. The flash light reflected by the subject is integrated by the photometer LM, and when this integrated value reaches a predetermined value, the photometer LM sends a flash signal to the flash control unit FC, which controls the flash. Light emission stops. At step #51, after waiting for a while and allowing the shank-rear curtain to run completely, proceed to step #52.
Information for displaying the standby state by extinguishing the shutter speed and aperture value displayed in step #1 is created, and this information is displayed on the display LI) i in step #53.
f2 is displayed. After that, in step #54,
) After resetting OX and enabling interrupts to the interrupt terminal lNTl in step #55, step #
The process advances to step 56 and enters a standby state.

Next-2, equivalent focus! [Figure 17 (a) shows how to calculate @.

This will be explained using (b).

In FIG. 17(a), r indicates the focal length of the photographing lens, and T indicates the height of the image projected onto the film Y in the normal photographing mode, so that the image height is QT. Consider the case of trimming to .

There is a relationship of Lanω=T/f + Lanω'=αT/f, and FIG. 17(b) shows the Q obtained by trimming.
It shows the relationship when the image height of T is extended to T, and X is the equivalent focal point Ill! It's far away.

In this case, from tanω' = T/X, x=T/
lanω'=:T/(αT/f>=Vα...■.

For example, when the focal length is 35 mm and the image height is 1/z, in this case, (
2=1/2, and the equivalent focal length is 35/(1/2)=
70a+m, the trimming size is 1/
It is now 4. Furthermore, if the trimming is done to half size, the value of α will be x/−Pi.

Therefore, as shown in the equivalent focal length calculation routine in Figure @14, if half-size trimming is performed, step #2
In 3-2, the value obtained by multiplying the focal length of the lens by ■ becomes the equivalent focal length, and if it is 1/4 size, step #2
The value obtained by doubling the focal length of the lens in 3-4 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 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 status of preview type 4 is determined. Exposure calculations outside of the preview operation are complicated, so this routine does not perform them.In step #95I, the equivalent aperture value is calculated in case the equivalent aperture value or preview aperture value is changed due to a change in trimming mode during shooting. and preview aperture calculation only.

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 the M (manual) mode, the process proceeds to step #69, where the manually set aperture value (Ay) 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.

Proceeding from step #68 to step #73, the manually set shutter speed Tν is read, and in the next step #74, the aperture value A is determined from the above Ev value and Tv value.
v is calculated. Then, based on the determination in step #75,
If it is not flash photography, proceed 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 7 lashes. After setting the aperture value Av to F5.6 in step #77,
It is determined in step #78 whether or not it is trimming photography, and if it is trimming photography, the aperture is shifted to the open side in accordance with the number of trimming steps in step #79, but if it is not trimming photography, the process proceeds to step #95.

In A (aperture priority) mode, the process advances from step #6'7 to step #80, where the manually set aperture value Av is read, and in the next step #81, the shutter speed is determined based on the above Ev value and Av value. From T, if you are shooting with flash and charging is completed, set the shutter speed to 1/60 seconds in step #83, and then step #95.
Proceed to. On the other hand, if flash photography is not being used, 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 in step #84.

Table 1 Equivalent focal length Camera shake warning Shutter speed 35mm or less 1730 seconds 35+++n+ -105+++n+ 1
760 seconds 105mm or more 17100 seconds This is because cameras that use cropping to increase the magnification during printing to obtain an effect similar to shooting with a long focal length lens do not determine the camera shake warning solely by the focal length of the lens. Since this is meaningless, 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 program 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 m + n or less, more than 35 + am and less than 105 Ill In, and 105 mm or more, respectively. Following this program line, in the next step #86,
A shutter speed Tv and an aperture value Av are calculated by a program from the exposure value EV. As a result, when the equivalent focal length becomes unrealistic, a higher shutter speed is set to prevent camera shake.

In step #87, it is determined whether the shooting is cropping. 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 as shown in Table 2 below, the process proceeds to step #88. 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.

If it is determined in step #90 that flash photography is not being performed, the camera shake warning buzzer B is activated in step #96.
The shutter speed for warning by Z is controlled according to Table 1 in the same manner as explained in the A mode, and the process then proceeds to step #95. On the other hand, if it is flash photography and charging is complete, step 77'#91. It is determined whether the shutter speed Tv is set to 17゛60 seconds and the aperture value is set to F5.6. If it is not a trimming shooting, the process proceeds to step #95. In the case of photographing, in step #94, the aperture is again shifted to the open side according to the number of trimming steps, as in step #88, and the process proceeds to step #95.

In step #95, an equivalent aperture value and a preview aperture value are calculated, and the equivalent 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 that used in explaining the equivalent focal length.

Generally, the depth of field (only in front) is given by a''Ll2・δ・F/“2...■.

([ is the focal length of the photographic lens, F is the aperture value) The depth of field when the actual focal length is VQ and the aperture is F is obtained from the above equations r2...■
The depth when trimmed to the equivalent focal length f/α is a""
u''αδ・F'/f2 = α・I2・F'/f2 ... ■With F'' as the aperture during trimming, the depth at the time of preview is a''=a・(I2・δ・F'/f2 = The actual depth can be confirmed by narrowing down the aperture to Fpv such as u2・δ・Fpv/r2.

As a result, Fpv=αF'...■Also, from formulas ■ and ■, if the aperture is the same during trimming and when shooting with a lens of equivalent focal length, then from F=F', al=α '
((2<1)...■, and it can be seen that the depth at the time of trimming is deeper.

On the other hand, the equivalent aperture seen from the depth of field is n, = a', so from the equations ■ and ■, F' = αF, so F
== FI / a... ■On the contrary, if you try to reduce the depth during trimming to obtain the expected depth with a lens of r/α corresponding to the equivalent focal length, the depth X at that time will be calculated from formula 0. , X = a2 - u 2 * δ - F'/[2, and the depth Y when cropping with the aperture open from F to F II is given by formula 0, Y = α・I2・δ・
F″/ f 2 roar.

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 equivalent aperture calculation routine shown in Figure 6, if the trimming size is half size, step #95-
In step 2, calculate the actual aperture Av of the spoken area by 1
If the step-down value is the equivalent aperture value and the trimming size is quarter size, step #95
-5, the value obtained by narrowing down the actual aperture value Av by two steps is set as the equivalent aperture value. Also, if the trimming is half size, the actual aperture value AV is determined in step #95-3.
If the trimming is a quarter size, the actual aperture value V is opened by two steps in step #95-6.

This is because even if the aperture is the same, photos obtained by cropping will have a shallower depth of field than photos taken in normal shooting mode, so by operating preview type 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.

As explained above, even if you are in the cropping shooting mode, the equivalent focal length and equivalent aperture value are displayed on the display LD1 according to the cropping size. The depth of field can be easily determined.

In the above embodiment, a camera with an interchangeable lens was described, but the present invention can also be applied to a camera with a fixed lens. Furthermore, even if the trimming size changes continuously, rather than in stages, the equivalent focal length and equivalent aperture value as described above can be displayed.

[Effect of the invention] According to the invention, even in the trimming shooting mode,
The equivalent focal length or equivalent aperture value is displayed on the display according to the cropping size, so the telephoto effect obtained by cropping can be improved.

[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, and 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 flow charts showing the operation of the bronc shown 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 down switch, 7... Accessory shoe, 8...
...Flash funector, 9...Metering mode changeover switch, 10...Aperture up/down switch, 1
DESCRIPTION OF SYMBOLS 1... Shooting mode changeover switch, 12... Lens lock button, 13... Signal transmission pin, 14... Aperture return button, 15... Mirror, 16... Reflector, 17...
... Prism, 18... Eyepiece, 19... Back cover, 20... Information transmission connector, LDI... Display, LD2... Focus plate, LEDl, LED2... Light emitting diode, 100 ...Microcomputer, 1
01...Differential circuit, 102...AND circuit, 81~
S12...Switch, FC...Flash control unit,
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...hood reading unit, LN... ·lens. Patent Applicant: Minolta Camera Co., Ltd. Agent Patent Attorney: Blue and White 葆 and 2 others 1161! 1 Figure 1 j>Shige Tsutareri χA 小O Figure 2 15 Mirror Figure 5. Figure tb) [E allowed] Luck] "]" ~. Figure 9 1411 Figure 12

Claims (1)

[Claims] (1) a trimming shooting mode that can specify an area narrower than the range to be printed in the normal shooting mode; and a trimming size signal output means that outputs a signal corresponding to the trimming size in the trimming shooting mode;
Photographing information signal output means for outputting at least one of the focal length or photographing aperture value of the attached lens as an information signal, and an equivalent focal length or equivalent aperture based on signals from the trimming size signal output means and photographing information signal output means. What is claimed is: 1. A camera capable of cropping photography, comprising: a calculation means for calculating a value; and a display means for displaying information from the calculation means.