JPH0398036A - Trimming camera - Google Patents

Abstract

PURPOSE:To take a photograph while displaying a zooming function over the entire zooming range by taking a picture preferentially by optical zooming when subject is brighter than a specific brightness value and preferentially by electronic zooming when the brightness of the subject is less than the specific brightness value. CONSTITUTION:The camera is equipped with a means 65 which detects the subject brightness, a means 50 which compares the subject brightness with the specific brightness value, and a means which gives priority to variation in photographic magnification by the electronic zooming when the subject brightness is less than the specific brightness value and to variation in photographic magnification by the electronic zooming when the subject brighter than the specific brightness value. Namely, when the subject brightness exceeds the specific brightness value, the optical zooming is performed preferentially to the electronic zooming, but when the brightness of the subject is less than the specific brightness value, the electronic zooming is carried out preferentially to the optical zooming. Consequently, a photograph which displays the zooming function over the entire zooming range of the optical zooming and electronic zooming is taken.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an optical zoom that performs zooming by changing the focal length of a shadow lens, and an electronic zoom that performs pseudo zooming by changing trimming information. The present invention relates to a trimming camera having:

[Prior art] Conventionally, an enlargement magnification is used to enlarge a part of a photographed film image to the normal angle of view size to create a pseudo-telephoto print. A trimming camera is known that records trimming information such as > on a film or the like. For example, JP-A-61-
Publication No. 295534 states that when the precision optical system is zoomed (optical zoom) by operating the zoom ring, and the zoom operation is performed beyond the zooming range of the Yukisho optical system, the above trimming information is What is imprinted adjacent to each frame is shown. In the negative film on which the trimming information has been imprinted, the image at the center of the screen of the film is stretched and printed based on the trimming information, and the resulting photograph is substantially the same as that obtained by zooming. Hereinafter, setting the trigging magnification as described above and changing the imaging magnification at the time of printing will be referred to as electronic zoom, as opposed to optical zoom using a shadow lens.

[Problem to be solved by the invention]

By the way, in the above-mentioned trimming camera, the electronic zoom functions when the magnification change range of the optical zoom is exceeded, so if the camera uses a photographic lens whose F number changes depending on the focal length, the shutter speed will slow down when the subject becomes dark. Photography errors due to camera shake are more likely to occur. For example, in the optical zoom of a projection lens with a focal length range of 35 to 70 mm and an E number that changes from 4.0 to 5.6 corresponding to the focal length, doubling the zoom ratio means that the lens system alone Since the exposure value decreases by IEv, if priority is given to optical zoom when the subject is dark, the shutter speed will become very slow and camera shake will easily occur. The wider the range of change in the F number of the photographic lens, the more difficult it becomes to take photographs with priority given to optical zoom.

The present invention has been made in view of the above problems, and uses different zoom methods that are prioritized depending on the conditions of subject brightness.
The purpose of the present invention is to provide a trimming camera capable of projecting photographs by making use of the zoom function in the entire zoom range of optical zoom and electronic zoom.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a trimming camera that has an electronic zoom that changes the shooting magnification in a pseudo manner by changing the cropping magnification, and an optical zoom that changes the shooting magnification by changing the focal length of the shooting lens. means for detecting subject brightness; and means for comparing the subject brightness with a predetermined brightness value; When the brightness value exceeds a predetermined brightness value, a means for giving priority to changing the field magnification by optical zooming is provided.

[Effect]

In the trimming camera configured as above,
The subject brightness is detected, and the subject brightness is compared with a predetermined brightness value to determine the i degree condition of the subject. If the object brightness is brighter than the predetermined brightness value, optical zoom takes priority over electronic zoom, and if the object brightness is lower than the predetermined gI degree value, electronic zoom takes priority over optical zoom.

〔Example〕

Next, an embodiment of the trimming camera of the present invention will be described.

Note that the camera of this example has a focal length of 35 to 70 (
It is equipped with a zoom lens that changes over a range of 1.5 mm (mm), and the maximum zoom ratio by electronic zoom is 2x. Therefore, by combining optical zoom and electronic zoom, this camera can zoom in the range of 35 to 140 (mm). FIG. 1 shows a configuration diagram of the photographic lens, the optical system of the finder, and the strobe of the trimming camera of this embodiment. Further, FIG. 2 is a plan view showing a schematic configuration of the optical system and strobe of the above-mentioned trimming camera. In FIG. 1, a photographic lens 1 is a zoom lens consisting of a front group 1a and a rear group 1b (see FIG. 2). Front group 1a and rear group 1
b refers to a cam groove 18 of a cam ring 18 that movably engages with a linear guide (not shown) formed in the lens barrel.
a and 18b in a slidable manner. A gear portion 18C is formed on the outer periphery of the cam ring 18, and a gear 21 for adjusting the rotational speed is screwed into the gear portion 18C. 19 are screwed together. Due to the above structure, the Z motor 14
The rotational force is transmitted to the cam ring 18 via the gear 19, the gear 21, and the gear portion 18c, and the cam ring 18 is rotationally driven. The front group 1a and the rear group 1b are operated by the rotational movement of the cam ring 18. are pushed by cams N18a and 18b, respectively, and move on the optical axis L1 (see FIG. 2) at different speeds along the linear guide. The focal length of the photographic lens 1 changes as the positions of the front group 1a and the rear group 1b change. Note that the open F value of this lens changes depending on the focal length, and is E4 at 35 mm and F5.6 at 70 mm. The finder 2 is a zoom finder having an objective lens group 4 consisting of a front group 41 and a rear group 42.

The support members 41a and 42b of the front group 41 and the rear group 42 are actively engaged with cam grooves 16a and 16b provided in the cam plate 16, respectively, and the support members 41a and 42b of the front group 41 and the rear group 42 are movably engaged with the cam grooves 16a and 16b provided in the cam plate 16, respectively, and the support members 41a and 42b are engaged with the cam grooves 16a and 16b provided in the cam plate 16, respectively. 23 (see FIG. 4) and is movably engaged with a straight guide groove (not shown). Also, cam plate 1
A rack part 16d is formed at the front end of the motor 6, and a finder motor (hereinafter referred to as F motor) is installed in the rack part 16d.
Fifteen gears 20 are screwed together. When the F motor 15 is rotationally driven by the above structure, the cam plate 16 moves toward the optical axis L2 (second
(see figure), and this horizontal movement causes the front group 4a and the rear group 4b to move into the cam grooves 16, respectively.
a and 16b, and move on the optical axis L2 at different speeds along the linear guide groove. The focal length of the finder 2 changes by changing the positions of the front group 4a and the rear group 4b.

Note that the optical axis L1 of the photographic lens 1 and the optical axis L of the objective lens 4
It is parallel to 2. Further, the variable focal length range of the finder 2 is configured to be larger than the variable focal length range of the photographing lens 1.

FIG. 3 shows the structure of the optical system of the finder 2. In the figure, 5 is an eyepiece lens, 6 is a condenser lens, 7 to 10 is a boromirror 11 is a field frame display member, and 12 is disposed below the mirror 8 and is optically conjugate with the field frame display member 11. It is a light receiving element placed at a position.

In this embodiment, a film that reflects ultraviolet light is deposited on the light receiving surface of the light receiving element 12, and the structure is simplified by omitting the ultraviolet light blocking filter.

The light beam transmitted through the objective lens 4 is reflected by mirrors 7 and 8, and after passing through the condenser lens 6, an inverted image of the subject is formed on the field frame display member 11, which is equivalently placed at the focal point of the objective lens 4. do. The visual field frame display member 11 is constituted by an electro-optical element such as an LCD or an ECD, and a visual field frame 118 is formed by a light shielding portion provided at the periphery of the visual field frame display member 11. The field frame display member 11 also displays the optical zoom or electronic zoom setting and the focal length calculated by the program zoom (described later).

The inverted image formed on the field frame display member 11 is reversed into an erect image by the mirrors 9 and 10 and guided to the eyepiece 5, so that the photographer can see the subject image within the field frame 11a through the eyepiece 5. can.

The mirror 8 is composed of a partially transmissive mirror with a transmissive part or a small hole in the center of the full mirror 11111, or a semi-transmissive mirror with a semi-transmissive mirror on the entire surface or only in the center. A part of the transmitted light beam is transmitted through the mirror 8 and is directed to the light receiving element 12. The signal received by the light receiving element 12 is used for exposure calculation for exposure control, and is also used for flash light amount control lII (:XA light amount control) when strobe light is emitted. The mirror 7 may be constituted by a semi-transmissive mirror, and the light receiving element 12 may be arranged at a position optically conjugate with the field frame display member 11 on the rear side of the mirror 7.
In the above embodiment, the light-receiving element 12 is arranged inside the finder 2, but it is arranged inside the camera body A to receive the subject light beam that passes through the photographic lens 1 and is reflected on the film surface. You can.

Returning to FIG. 1, the strobe 3 is a zoom strobe that can be moved in the front-rear direction (direction parallel to the light @L1) by horizontally moving the cam plate 16. FIG. 4 shows a front view of the strobe 3, FIG. 5 shows a sectional view along the line v--2 in FIG. 4, and FIG. 6 shows a sectional view along the line VI--Vl in FIG.

The support member 33a of the holder 33 of the strobe 3 is the cam plate 1
It is slidably engaged with the cam 11 6c provided on the cam plate 6, and is also movably engaged with the linear guide groove 23a of the linear guide plate 23 (see FIG. 4), and as described above, the cam plate 16 When the support member 33a moves horizontally, the support member 33a is pushed by the cam groove 160, and the holder 33 moves in the front-rear direction.

On the other hand, the hat 31 is fixed to the camera body A, and when the holder 33 moves back and forth, the xe ring 32 held by the holder 33 moves into the guide groove 31a (light The relative distance between the xe ring 32 and the opposite slope 3lb of the anti-crossover hat 31 is changed.

With the above structure, as the focal length of the finder 2 increases, the irradiation angle of the strobe 3 becomes smaller (the irradiation distance of the strobe light becomes longer), and as the focal length of the finder 2 decreases, the irradiation angle of the strobe 3 increases ( (The illumination distance of the strobe light becomes shorter). That is, by operating the zoom switch (not shown), the motor 15 rotates normally (clockwise).
When driven, the cam plate 16 moves in parallel in a direction away from the photographic lens 1 (to the right in the figure). By the parallel movement of the cam plate 16, the front group 4a and the rear group 4b of the objective lens 4 of the finder 2 are extended toward the front of the camera along the linear guide while decreasing the relative distance between them and increasing the focal length. The magnification increases. On the other hand, the holder 33 of the strobe 3 moves backward toward the camera along the straight guide 23a due to the parallel movement of the cam plate 16, and Xe! The relative distance between l32 and the opposite slope 31b of the anti-crossover hat 31 is shortened, and the flashing angle of the strobe 3 is reduced.

When the F motor 15 is driven in reverse (counterclockwise), the cam plate 16 moves in parallel in the direction approaching the photographing lens 1 (to the left in the figure), and the holder 33 of the objective lens 4 and strobe 3
operates in the opposite manner to the above-described operation, the magnification of the finder 2 becomes smaller and the irradiation angle of the strobe 3 becomes larger.

In the above embodiment, the illumination angle of the strobe 3 is changed in conjunction with the zooming of the finder 2, but the illumination angle may be changed in conjunction with the zooming of the photographic lens 1. .

Returning to FIG. 1, 17 is a film container, and 22 is a film. The film container 17 has a microcomputer (hereinafter referred to as microcomputer) with a built-in memory, and is configured to record information such as a trimming magnification, which will be described later.

Next, the circuit structure of this trimming camera will be explained. FIG. 7(a) shows an embodiment of the circuit structure of a trickling camera. In the figure, numeral 50 is a microcomputer that centrally controls the drive of each actuator, which will be described below, and also performs camera sequence and exposure calculations. 51 controls the rotation direction and drive amount of the motor 15 by command signals from the microcomputer 50.
It is an 11K1 circuit. 52 is an encoder that detects the focal length of the finder 2. 53 is a ZL motor control circuit that controls the rotational direction and drive amount of the ZL motor 14 based on command signals from the microcomputer 50. 54 is photographing lens 1
This is an encoder that detects the focal length of the 55 is a film motor 5 for winding the film 22 one frame at a time.
This is a film motor control circuit that controls the drive of 6. 5
7 is a microcomputer with a built-in memory provided in the film container 17; 58 is a Dx circuit for detecting the film sensitivity Sv coded on the film container 17; and 59 is a focal length set by optical zoom or electronic zoom; Focus v calculated by auto program zoom (described later)
60 is a force single lens motor control circuit that controls the drive of a force single lens motor 61 which is a drive source for the focal point XI lens of the imaging lens 1. 62 is a shutter control circuit that controls the opening and closing operations of the shutter. The shutter used in this embodiment is a shutter that also serves as an aperture, and when the shutter bead is determined in accordance with the exposure value, the aperture value is automatically determined. For example, the shutter speed and aperture value are
The relationship is as shown in the program diagram shown in the figure.

In addition, in the same figure, A has a lens focal length of 35 mm.
B shows the case where the focal length of the lens is 70 mm. At any focal length of the lens, the shutter speed and aperture value are 4 as shown by C.
1! It is a program line between A and B. In addition, in a normal range where the shutter speed bead and aperture value both change (a region where the shutter speed is faster than 1/30 second), the change in aperture value and the amount of change in the shutter speed bead with respect to a change in exposure value are equal. It has become.

Reference numeral 63 denotes a flash 8i having a zoom strobe 3 and whose light emission timing is controlled by a light emission start signal from the microcomputer 50. 64 integrates the reflected light from the subject due to the flash light received by the light receiving element 12, and when a predetermined exposure amount is reached, outputs a light emission stop signal to the flash device 63 to stop the flash light 3 from emitting light. This is a dimming circuit. Reference numeral 65 denotes a photometry circuit that measures the brightness of the object by receiving natural light reflected from the object by the light receiving element 12, and 66 represents a distance measurement circuit that detects the distance to the object.

Here, a specific example of the dimming circuit 64 and the photometry circuit 65 is shown in FIG. 7(b) and will be described. As shown in the figure, the input parts of the dimming circuit 64 and the photometry circuit 65 of this embodiment are common, and include the light receiving element 12, the operational amplifier OP, and the operational amplifier OP.
It consists of a logarithmic compression diode Dp provided between the (-> side input terminal and output terminal of the photometering circuit 65.
converts the output voltage of this operational amplifier OP to the A/D converter 67
The signal is A/D converted and output to the microcomputer 50. On the other hand, the dimming circuit 64 includes a transistor Q1 that expands the logarithmically compressed voltage, a capacitor C1 that stores the expanded voltage, and a microcomputer 5.
It turns off at the strobe light emission timing from 0, and the capacitor CI. : Switch SWIN that starts charge accumulation,
The flash device 63 includes a converter 68 that compares the voltage of this capacitor C with a reference voltage vr and inverts the output when the voltage of the capacitor reaches a predetermined voltage vr.
stops emitting light when this output voltage (stop signal) is input. Note that the reference voltage ■'' is changed according to the itll III shutter speed Tvc sent from the microcomputer 50. This is because the camera of this embodiment is equipped with a lens shutter, and the aperture of the shutter This is to compensate for changes in the amount of flash light incident on the film surface per unit time depending on the aperture.For example, the higher the speed of the control shaft bead Tvc (the smaller the aperture aperture), the more the amount of flash light incident on the film surface changes. Therefore, the faster the control shutter speed Tvc is, the higher the reference voltage ``is'' will be set to delay the timing at which the stop signal is output, and the unit time for entering the film surface will be reduced. This compensates for the decrease in the amount of flash light per unit.It goes without saying that the reference voltage Vr depends on the sensitivity S of the film used.
It can be changed according to v.

Next, I will explain the switches. The switch S1 is a photographing preparation switch that is turned on when the release button is pressed halfway. When the switch S1 is turned on, photometry and distance measurement for photographing are performed. The switch S2 is a release switch that is turned on when the release button is pressed.

When the switch S2 is turned on, exposure is started.

Switch S3 is a zoom mode changeover switch that changes over between auto program zoom and power zoom. Auto program zoom (hereinafter abbreviated as APZ) is a mode in which the focal length is automatically determined (zoomed) according to the subject distance detected by the distance measuring circuit 66 so as to obtain a predetermined imaging magnification. In addition, power zoom (hereinafter referred to as PZ
) is a mode in which an arbitrary focal length is set (zooming) by manual operation.

The switch S4 is turned on when the photographing lens 1 is at the initial position [(R is also the state in which the lens is retracted, and in this example, the focal length of the lens at that time is the minimum (35 mm))]. This is a zoom reset switch.When photographing is completed, the photographing lens 1 is always returned to the initial position, and the above-mentioned return operation is detected when the switch S4 is turned on.

The switch S5 is a switch for forcibly prohibiting the strobe light 3 from emitting light when operated by the image projector.

In the on state, flashing of the strobe 3 is prohibited.

The switch SZT and the switch Szw are switches operated by Akira Koji in the PZ mode to instruct the drive direction of the shadow lens 1. The image transport lens 1 is a switch SZT
When turned on, it is driven to the Tee side and the switch S
When zw is turned on, it is driven to the wide side.

Next, an outline of the photographing operation of the trimming camera according to the present invention will be explained. The cropping camera according to the present invention has an optical zoom and an electronic zoom, and can take photos in APZ mode in the entire zoom range of the optical zoom and electronic zoom! I'm trying to do shadows.

As mentioned above, the prefectural lens of the camera in this example is
It is a zoom lens whose focal length is variable in the range of 35 mm to 70 mm, and the zoom ratio of the electronic zoom is set to 2x. As a result, with this camera, it is practically possible to
Zooming can be performed within a range of 140 mm.

For example, if the set focal length is 105 mm (zoom ratio 3x), the focal length of the photographing lens 1 is set to 70 mm (zoom ratio 2x) and a photo is taken, and the electronic zoom is 1.5x. The cropping magnification is set and recorded in the memory of the film container 17.The cropping magnification is read out at the time of printing and is used to capture a portion of the film image (usually the central portion where the main subject is depicted). is enlarged 1.5 times and printed. Therefore, a print of a photograph taken with the focal length of the photographic lens 1 set to 105 mm (zoom ratio 3 times) is obtained.

When taking photos in APZ mode, the focal length range is 35 to 14 using both optical zoom and electronic zoom as described above.
Program zoom is performed at 0 mm. For example, in a program zoom where the frequently used focal length is approximately 1760, which is calculated from the detected subject distance, and the focal length calculated from the subject distance is 105 mm, the focal length of the finder 2 will be set to the equivalent of 105 mm. ,
Through the finder 2, you can see an angle of view with a focal length of 105mm. When photographing a road shadow, the focal length of the photographing lens 1 is set to a maximum focal length of 1170 mm to take a photograph, and a cropping magnification of 1.5x is set using the electronic zoom.As mentioned above, when printing, the photographing lens 1 is substantially A photograph was taken with the focal length set to 105 mm.

Note that electronic zoom is not limited to use outside the range of optical zoom, and may be used alone or in combination within the range of optical zoom. By using optical zoom and electronic zoom properly depending on the conditions of subject brightness and subject distance, It is possible to obtain a desired focal length.

As mentioned above, when taking photos using APZ for the entire zoom range of optical zoom and electronic zoom, the photographable subject distance range expands to approximately 1 to 5 m (approximately 1 to 3 m in the case of optical zoom only), and the zoom Even with a camera having a lens with a small ratio, it is possible to easily enjoy photographic photography with a zoom function for a wide range of subjects.

Next, the operation of the camera will be explained using FIGS. 9 to 16. FIG. 9 shows the main flow. first,
When the main power is turned on and the camera is started, it is determined whether the switch S1 is turned on (#5). If it is in the ON state, the rs+ONJ subroutine described later is executed (#10 (#70)). If it is off, the zoom mode is determined from the state of switch S3 (#10), and A
If it is PZ mode, return to #5. In Pz mode, switch SZT. The moving direction (zooming direction) of the objective lens 4 of the finder 2 is determined from the SZW state (#20, #30). If the moving direction is on the wide side, set the target focal length Z to 35 mm (#25
), on the Te I e side, set the target focal length Z to 1
After setting the focal length to 40 mm (#35), execute the "finder control" subroutine described later to set the focal length of the finder 2 to a value corresponding to the target focal length (#35).
40 (#1 60) ), return to step #5.

Switch SZT. If both SZWs are off,
It is determined from the state of flag ZFMUF whether the F motor 15 is being driven (#45). In addition, the flag ZFM (
JF is set to 1 if the F motor 15 is being driven. If the F motor 15 is stopped, the process returns to #5, and if the F motor 15 is driving, the F motor 15 is set to 1.
After applying the brake for 0ms e C (short status), the power supply is turned off, the flag ZFMUF is reset to O, and the process returns to #5 (#50 to #60).

Next, the rs+ ONJ subroutine will be explained using FIG. 10. In the rs10NJ subroutine,
It measures the brightness of the subject, performs exposure calculations, and extracts the exposure control value. In the case of APZ mode, the magnification data of optical zoom and electronic zoom are calculated from the measured subject distance so that a predetermined reflection magnification is achieved. When the release signal is issued, the focal length of the photographing lens 1 is set based on the set or calculated optical zoom magnification data, the bint is adjusted based on the measured subject distance, and the exposure is adjusted based on the exposure control value. conduct.

When the switch S1 is turned on, first, the photometry circuit 65 and the distance measurement circuit 66 are operated to measure the subject distance Dv and the subject brightness B.
v is detected (#70, #75). Next, the zoom mode is determined (#80), and if it is the APZ mode, the target focal length 2 is calculated according to the subject distance Dv, and the "finder control" subroutine described later is executed to adjust the focus of the finder 2. Set the distance to a value corresponding to the above target focal length 2 (#85, #90 (#1 60))
.

If the zoom mode is PZ mode, the process skips to step #95 and the automatic adjustment of the focal length of the finder 2 is not performed. In addition, in step #85, the focal length mz is calculated from the subject distance Dv so as to obtain a predetermined imaging magnification, for example, from the subject distance Dv using the relational expression Z-a·Dv+t) (a and b are constants). Ru.

Next, the "exposure calculation" subroutine to be described later is executed to calculate the magnification data Oz% related to the photographing magnification of the optical zoom, the magnification data EZ related to the electronic zoom magnification, the control shirt tas bead Tvc, etc. (#95 (# 250))
, Execute the "Display" subroutine to be described later to display the information on the magnification data OZ or EZ in the viewfinder or on the display section provided at the top of the camera (#100 (
#500)). Here, the magnification data OZ and EZ are O~
A value of 1, 02-0 indicates that the zoom ratio of the photographic lens is 1x, that is, the focal length of photographic lens 1 is 35 mm, and OZ=1 indicates that the zoom ratio of the photographic lens is 2 times, that is, that the focal length of photographic lens 1 is 35 mm. shows that the focal length of is 70 mm. In addition, the magnification data EZ-0 has a trimming magnification of the same size (
Full-screen printing〉゛, that is, a pseudo magnification by electronic zoom is not set. (printed).

Next, the state of the release switch S2 is determined, and if it is in the off state, the state of the switch s1 is determined (#105.
#145). If the switch S1 is on, the process waits until the release switch S2 is turned on, and if it is off, the process returns to #5. If the release switch S2 is on, the setting value of the magnification data Oz is determined and the focal length of the photographic lens 1 is adjusted (optical zoom) (#
115〉. That is, if the magnification data Oz is not 0,
Execute the "zoom lens control" subroutine to be described later to set the focal length of the photographing lens 1 to the focal length corresponding to the set value of the magnification data OZ (#1 1 5 (#55)
0) ). If the magnification data OZ is O, skip to #120. That is, the focal length of the photographic lens 1 is kept at the initial state (35 mm). When the focal length of the photographic lens 1 is set (optical zoom is completed), the "
The subroutine "exposure control" is executed, and the film surface is exposed to a predetermined amount according to the exposure control l21la calculated in #95 (#1 20 (#600)). When the exposure is finished,
After storing the magnification data EZ calculated in #95 in the memory of the microcomputer 57, the subroutine of "zoom lens control" to be described later is executed to return the projection lens 1 to the initial state (#125, #130 ( #550)) Wind the film one frame (#135). Then, the process waits until the switch S1 is turned off, and then returns to #5.

Next, the "finder control" subroutine will be explained using FIG. 11. In the "finder control" subroutine, when in PZ mode, the objective lens 4 is moved in a specified direction, and when in APZ mode, the focal length of finder 2 is set to a value corresponding to the target focal length calculated from the subject distance. Automatically set to .

First, the focal length of the finder 2 at the current position is detected from the encoder 26, and the corresponding focal length MFZ of the lens is detected. Then, the focal length 11FZ is compared with the target focal length Z calculated in #85 (#160
, #165). If the focal length FZ is equal to the target focal length llIZ, the process immediately returns to #5 or #100. In addition, "Finder control" starts from #40 of the main routine.
Those that entered the routine (PZ mode) return to #5, and those that entered the "finder control" routine from #90 of the rs10NJ subroutine (APZ mode) return to #95. Focal length #iFZ is the target focus distance l
1z, the flag ZFMU" is set to 1, and the zoom direction of the finder 2 is determined from the magnitude relationship between the focal length FZ and the target focal length Z (#1 70.#
175). If Z>FZ, the objective lens 4 of the finder 2 is moved in the Tele direction, and if Z<FZ, the objective lens 4 is moved in the Wide direction (#180.#185). Next, determine the zoom mode, and if it is PZ mode, immediately return to #5,
In the APZ mode, the focal length FZ corresponding to the current position of the finder 2 is detected from the encoder 26, and the focal length FZ corresponding to the current position of the finder 2 is compared with the target focal length l1z.
Move the objective lens 4 until (#190 to #2
00). Next, after applying the brake to the F motor 15 for iomsec, the power supply is turned off, and the flag Z is turned off.
Reset FMLIF to O and return to #95 (
#210-#220).

Next, the "exposure calculation" subroutine will be explained using FIG. 12. In the "exposure calculation" subroutine, the shooting modes (natural light prefecture shadow, flash shooting) are classified according to the conditions of subject distance and subject brightness, and the exposure control value for each transport mode is determined, as well as the electronic zoom magnification data. Calculate EZ and optical zoom magnification data OZ.

In addition, different zoom methods are used depending on the subject conditions; when the subject is bright, priority is given to optical zoom, and when the subject is dark and a strobe is used, electronic zoom is given priority.

Furthermore, when photographing a subject by prohibiting strobe light emission even when the subject is dark, electronic zoom and optical zoom are combined in consideration of the exposure control value.

First, the flag FLF indicating flash photography is reset to O, and the magnification data Oz and EZ and the exposure compensation value ΔEv are set to O.
(#250 to #265). Next, the film sensitivity Sv of the loaded film 22 is calculated by D x circuit 5.
8, and the exposure value Ev is determined from the film sensitivity Sv and the subject brightness 3v detected in #75 (see Figure 10).
Calculate (=Bv+Sv) #2AO, #275).
Subsequently, from the encoder 26, the focal length FZ corresponding to the focal length of the finder 2, that is, the manual setting or the AP
Detects the focal length automatically set by Z, and uses the focal length FZ to paralyze the camera shake limit of the shutter speed bead TVF (#280. #285>. This shutter speed TV
F is the value of 1/FZ converted into an avex value. Next, it is determined whether the focal length FZ is 7Qmm or less, and if FZ>70mm, the exposure compensation value ΔEv is set to 1, and if FZ≦7Qmm, the exposure compensation value ΔEv is set to a value according to the focal length FZ. Set (#295.#300
). This exposure correction value ΔEv is stored in advance in the memory of the microcomputer 50, and is read out using FZ as an address. Here, this exposure correction will be explained with reference to FIG. 17.

In the figure, A shows a program diagram when the focal length of the lens is the standard value (in the example, the minimum value, that is, 35 mm), and C shows a program diagram at an arbitrary focal length. There is.

AVO%AVO' indicates the reference focal length and the open aperture value at a given focal length, respectively.As shown in the figure, with this camera, when the lens focal length changes, the lens aperture value (effective aperture value) changes. Let the amount of change in this open aperture value be ΔAvo. Here, the photometric value B V
If the exposure value obtained from N film sensitivity Sv is Ev, then
When the focal length of the lens is set to the reference value (program diagram A), the subject is appropriately exposed when the shirt tas bead is Tv. However, when the focal length of the lens is changed (program diagram C), the subject will not be properly exposed unless the shutter speed is set to Tvc.

By the way, since the shutter speed calculated by the microcomputer 50 is obtained based on the standard B-O gram diagram A,
In order to properly expose the subject, the exposure value Ev must be corrected according to the focal length of the lens. Assuming that the exposure value after this correction is Ev', the shutter speed at the intersection of the standard program diagram A and the straight line indicating exposure II Ev' is Tvc, as shown in the figure. In other words,
In #295 and #300, the difference ΔEv between the exposure value Ev and the corrected exposure value Ev is calculated, and in #305, the corrected exposure value Ev' is calculated, and FZ>
When 70mm, ΔEv=1 (#295> means that when FZ>70mm, the focal length of the lens is set to 7
This is because the camera is set to Qmm and the shortfall is compensated for by electronic zoom. Note that, as is clear from FIG. 17, the exposure correction amount ΔEv is equal to the amount of change ΔAvo in the open aperture value.

Note that if the flat of the finder objective lens is of a type that changes with zooming, the F value of the finder objective lens may be detected and the amount of change ΔAvo in the open aperture value may be determined based on it.

Note that, as described above, when the focal length FZ is 35 to 70 mm, priority is given to optical zoom, the focal length of the photographic lens 1 is set to FZ, and photographing is performed, and electronic zoom is not used. When the focal length FZ exceeds 70 mm, optical zoom and electronic zoom are used together. This is because the more the image on the film is stretched, the lower the image quality becomes.

When the exposure correction value ΔEv is set, the exposure correction value ΔEv is subtracted from the exposure value Ev calculated in #275 to correct the exposure value Ev, and the shirt tas bead Tv is calculated from the corrected exposure value Ev. (#310). Further, magnification data fzlI regarding the zoom ratio is set from the focal length FZ. The magnification data fzβ is data having the same meaning as the magnification data OZ and EZ, and a value of O to 2 is set corresponding to the focal length 111FZ. For example, for FZ-35mm, fzs-0, for FZ-70mm, fZJ=1, FZ-
140mmr is set to fzs=2.

Next, compare the above-mentioned shirt tas bead Tv and the camera shake limit shirt tas bead TVF (#320) and find that NTV≧Tv
If p, the process moves to #325 to #340 and sets magnification data OZ and EZ giving priority to optical zoom. That is, it is determined whether FZ≦70mm, and FZ≦7Q.
mm, magnification data O to perform optical zoom only.
Set magnification data fZA to Z (#325.#33
0). If FZ > 70mm, set the magnification data oZ to 1 and set the magnification data EZ to fzβ-1 so that the optical zoom is set to the maximum magnification and the insufficient magnification is set to the trimming magnification of the electronic zoom (#335 , #340
). And the shirt tas beed Tv calculated in #310
Control shirt tas bead Tvc (#390), #1
Return to 05.

If TV<TVF in #320, it is determined from the state of switch S5 and the charging state of the main capacitor for flash light emission whether or not the strobe light emission prohibition mode is set (#345
). If it is not the light emission prohibition mode, a flag FLF is set to 1 to permit flash light emission (#350). Then, the process moves to #355 to #390, where priority is given to electronic zoom, magnification data OZ%EZ is set, and control shirt tas bead Tvc is set. That is, Z≦70 in #355
Determine whether it is mm, and if FZ≦70mm,
Magnification data fzlI is set in magnification data EZ so that only electronic zoom is performed. Then, a correction amount is added to the exposure value Ev in order to return the exposure value Ev corrected in #290 to #305 to the value determined in #275. This is because optical zoom is not performed when the focal length {equivalent} is 70 mm or less. Thereafter, the shirt speed bead Tv is determined based on the restored exposure value Ev (#385), the shirt speed bead Tv is set as the control shirt speed Tvc (#390), and the process returns.

On the other hand, if FZ>70mm, set the electronic zoom trimming magnification to the maximum magnification, set the magnification data EZ to 1 to compensate for the insufficient magnification with the optical zoom, and set the magnification data O.
Set Z to fzβ-1 (#365, #370).

Next, an exposure correction value ΔEv is set from the magnification data ○Z, and the correction value ΔEv is added to the exposure value Ev to obtain the exposure value E.
Further correct v. Then, based on this exposure value Ev, ill_ml_shi17'/tasbeed_Tvc is calculated and the process returns to #105 (#375 to #390). In the above-mentioned image projection by strobe light emission, electronic zoom is given priority by shortening the focal length of the photographing lens 1 as much as possible and reducing the effective aperture value (increasing the aperture aperture), thereby reducing the distance that the flash light reaches. This is to increase the . The camera of this example (zoom lens (focal length 35
~70mm, l: number 4.0~5.6)), when using a strobe with guide number GNO-15, the flash light reach distance is 3.8m when the focal length l is 135mm, and when the focal length is 70mm. The flash light reach distance is 2.7m. Therefore, if priority is given to electronic zoom, for example, in photographic imaging with a zoom ratio of 2x, the flash light's reach will be approximately 1.4 times greater, resulting in a significant improvement. Note that when the subject is bright (Tv≧TVF), optical zoom is given priority over electronic zoom. However, even when the subject is bright, if the strobe 3 is fired due to backlight, the electronic zoom is prioritized as described above. It may be given priority over zoom.

As is clear from the above description, during flash photography, the control shot bead Tvc is determined so that it is appropriate using only natural light. Therefore, if the strobe 3 is used to emit light, overexposure will occur. In addition, in very dark situations, the control shutter speed Tvc may be lower than the camera shake limit value TVF (low speed) even though the camera is shooting with flash.
Sometimes it becomes. However, these things are not much of a problem as described below.

In a trimming camera like this embodiment, negative film is often used because the effect of electronic zoom usually appears only after printing.

Moreover, the latitude of negative film is relatively wide (especially wide on the over side), and it is also possible to correct the exposure amount when obtaining prints from negative film. Therefore, overexposure is not much of a problem.

On the contrary, since overexposure improves graininess, overexposure may even be desirable in a camera equipped with an electronic zoom function, such as the camera of this embodiment.

Next, when it is very dark and the control shutter speed Tvc becomes smaller than the camera shake limit value TVF, the flash time of strobe 3 is very short, so the main subject is exposed without shaking, and the slow synchronization You can get the same effect.

If the flash prohibition mode is determined in #345, the exposure 1a E v corrected in #305 and the exposure value of camera shake limit EVF
(Set the focal length of the lens to the shortest, set the maximum aperture to the minimum (F4), and set the shutter speed to 1, the camera shake limit.
! The difference ΔEVF from the exposure value when set to T V F is calculated. In other words, the #310F calculated shirt tas bead Tv and the limit shirt ta speed KTV are compared, and the Tv
If ≧KTV, calculate the difference ΔEVF from the following formula ■, and calculate T
If V<KTV, the difference ΔEVF is calculated from the following formula (2) (#395 to #405). Here, the limit shutter speed KTV is the limit value of the shutter speed at which both the aperture value and the shutter speed can be controlled, that is, the shutter speed bead at the bending point of the program line. As shown, it is 1/30 second (5 in APEX value).

ΔEVF-2 (TVF-KTV > + (KTV-Tv)...■ ΔEVF-2 (TVF-Tv) ・"■Here, referring to Fig. 18, we will explain the case of natural light photography in low brightness. In the same figure, <8) indicates the case where Tv≧KTv%△Evp≦ΔEv,
(b> shows the case where TV<KTV%ΔEVF>ΔEv. In both figures, the exposure value obtained in #305 is expressed as Ev, and the exposure value after correction in #305 is expressed as Ev.
' In addition, in the camera of this example, the minimum possible focal length is 35 mm, and #2
Shafta speed TVF with the camera shake limit required by 85
is expressed as the reciprocal of the focal length, so TVF ≧log, 3 5≧log, 30=K7v
It is.

The difference ΔEVF between the exposure li1 E v ' after correction in #305 and the exposure value EVF of the camera shake limit is Tv≧KT
When V, as is clear from FIG. 18(a), ΔEVF=(TVF−Tv)+ΔAv.

However, ΔAv is the difference from the aperture value when the shirt tassel bead is Tv. As described above (FIG. 8), since the amount of change in the aperture value and the amount of change in shutter speed with respect to the amount of change in exposure value are equal, ΔAv=Tvp−Tv holds true. Therefore, ΔEvp=2 (TVF-Tv) (#405). On the other hand, when TV<KTV, as is clear from FIG. 18(b), ΔEVF=(KTV
-TVF) +(TvpKTV)+ΔAy. Then, as above, ΔAv = Tv v
-Tv holds, so ΔEVF = (KTV-TVF)+2 (TVF-
KTV) (#400).

Next, the correction amount ΔEv obtained in #295 and #300 and #4
00, and the relationship with the difference ΔEvp obtained in #405 will be considered.

First, ΔEvir≦ΔEv means that the amount of correction made in #290 was too large, causing camera shake. In other words, this means that too much priority was given to optical zoom, which resulted in camera shake. Therefore, in this case, by increasing the electronic zoom ratio, camera shake will not occur and appropriate exposure can be obtained. That is, as shown in FIG. 18(a), if the focal length of the photographic lens 1 is set to FZ' or less, the shutter speed for properly exposing the subject will be faster than the TVF, and camera shake will not occur. It disappears.

On the other hand, if ΔEVF>ΔEv, as is clear from FIG. 18(b), the shutter speed is adjusted to the camera shake limit lIT.
When set to VF, the subject will be underexposed even if you reduce the effective aperture value (larger the aperture) without using any optical zoom.In other words, even if you prioritize electronic zoom, camera shake will occur. This will result in

Next, referring back to FIG. 12, specific control when performing natural light photography with low brightness using the camera of this embodiment will be described.

After determining the difference ΔEvp in exposure values in #400 and #405, the difference ΔEVF is compared in #410 with the correction amount ΔEv determined in #295 and #300.

ΔEvp>ΔE v s In other words, if camera shake occurs even if electronic zoom is prioritized, proceed to #355 to #390.
Prioritize electronic zoom and set magnification to 02. Set EZ and find the control shirt tas bead Tvc.

This makes it possible to properly expose the subject while preventing camera shake as much as possible. Since #355 to #390 have already been explained, detailed explanation will be omitted.

In #410, if ΔEvp≦ΔE■, that is, if the electronic zoom ratio is increased, the subject can be properly exposed while preventing camera shake, proceed to #415, and if the set or calculated focal length FZ is 7Qmm or less, Determine whether there is. When FZ≦7Qmm, #420~#
The process proceeds to step 465, and image transport is performed with priority given to optical zoom as much as possible while preventing camera shake. In other words, the control shirt tab bead Tvc is set to the camera shake limit value TVF, and the shirt tab bead in the program diagram becomes appropriate (in the program diagram in FIG. 18(a), Tv=intersection of TVF and Ev
The focal length FZ' of the m-shadow lens 1 such that the image passes through is determined, and optical zoom is performed. Specifically, first, the correction amount Δfzβ of the magnification fzβ is calculated from the exposure value difference ΔEVF (#
420). This correction amount Δfzβ is stored in advance in a memory within the microcomputer 50, and is read out using the difference ΔEVF as an address. Next, add f to the optical zoom magnification data OZ.
Set ZB-Δfzβ, and set electronic zoom magnification data E.
Set Δfzβ in Z (#425, #430). Then, control shutter speed Tvc is set to camera shake limit value TV.
Set it to F (#435, #465) and return to #105.

In addition, the magnification data fzβ - Δf set in #425
ZB corresponds to the focal length FZ' shown in FIG. 18(a).

When FZ>70mm in #415, #440 to #4
Proceed to step 65, give priority to electronic zoom, and set magnification data 02,E.
Set Z and find the control shaft bead Tvc. This specific operation is the same as the operations #365 to #390 described above, so detailed explanation thereof will be omitted.

Here, if ΔEVF≦ΔEv and FZ>7Qmm, the reason why the magnification data and control shutter speed Tvc are determined with priority given to electronic zoom will be explained.

As mentioned above, if ΔEvp≦ΔEv, it is possible to properly expose the subject while preventing camera shake by increasing the ratio of electronic zoom, but in reality, optical zoom and electronic zoom have their limits ( In the camera of this example,
Optical zoom is 35-70mm! Since the maximum magnification by child zoom is 2x, even if ΔEvp≦ΔEv,
If FZ>70mm, camera shake may occur if the subject is properly exposed. For example, the focal length FZ' (see Fig. 18(a)) of the photographic lens that allows proper exposure at the shutter speed Tvv, which is the limit of camera shake, is 50.
Assume that mm. At this time, if FZ≦100mm, the focal length of the photographing lens can be adjusted to 50mm using optical zoom.
If you set mm and compensate for the shortfall with electronic zoom,
It is possible to properly expose the subject while preventing camera shake. However, if FZ>100mm, the maximum magnification by electronic zoom is 2x, so the focal length of the projection lens must be made longer than 5Qmm by optical zoom (for example, if FZ=120mm, the optical Due to the zoom, the focal length of the high-density lens must be set to 60 mm or more. Therefore, if the subject is properly exposed, camera shake will occur.

For the above reasons, even if ΔEVF≦ΔEv, FZ>7
If it is 0 mm, electronic zoom is given priority and magnification data and control shutter speed are determined.

As a result, when Tvv>Tvs and FZ>70mm, zooming and exposure control are exactly the same except for whether or not to fire the flash, reducing the number of steps required for software creation, sharing programs, and As a result, memory capacity can be reduced.

In addition, when ΔEVF≦ΔEv, instead of #415, Δ
Find the focal length wiFZ' based on the EVF, and find that FZ>2
FZ'(2FZ' is FZ' I, -'14 children; C
If FZ≦2FZ', proceed to #420 and below, and if FZ>2FZ' ra5, proceed to #440 and below. . As a result, when flash emission is not involved, it is possible to improve the image quality by using the optical zoom as much as possible, and to take proper photographs without camera shake.

Next, the "display" subroutine will be explained using FIG. 13. Display is performed within the finder, and for example, a display pattern shown in FIG. 14 is formed on the field frame member 11. In the figure, a display 70 indicates that electronic zooming is performed, and a display 71 indicates that optical zooming is performed. Further, the display section 72 displays the value of the set focal length FZ.

First, the magnification data O set in the "exposure control" routine
Determine the value of Z, and if 02=0, turn off the "OZ" display, and if 02=0, turn on the rOZJ display (
#500~#510). Next, the value of magnification data EZ is determined, and if it is EZ-0, the rEZJ display is turned off and E
If Z=0, rEZJ(7) fi indicator lights up (#
500~#510). Subsequently, the value of the focal length "Z" is displayed on the display section 72 (#530), and the process returns to #110.

Note that a display section such as an LCD panel is provided on the outside of the camera, for example on the top surface, and the rEZJ, rRZJ, focal length FZ
etc. may be displayed.

Next, the "zoom lens control" subroutine will be explained using FIG. 15. "The zoom lens control tllJ subroutine is a flow for driving the ZL motor 14 based on the magnification data Oz and setting the focal length of the projection lens 1 to a predetermined focal length.

First, a flag ZFM indicating that the photographic lens 1 has been driven
Determine whether F is set to 1 (#550
). If it is reset to O, the control is to extend the photographic lens 1 to the target focal length (see #115 in FIG. 10), so the process moves to #555 to #570, and the control to extend the photographic lens 1 is performed. That is, control is performed to drive the ZL motor 14 forward (clockwise) and extend the photographing lens 1 toward the Tele side (#555). At the same time, the encoder 54
A signal Z indicating the focal length of the current position of the lens 1 from
L is detected, the value of the signal ZL is compared with the magnification data Oz, and the ZL motor 14 is driven until it becomes ZL-02 (
#560. #565).

When it becomes ZL-02, set flag ZFMF to 1,
After applying the brake to the ZL motor 14 for 10 msec,
The power supply is turned off and the process returns to #125 (#570, #590, #595). If the flag ZFMF is set to 1, that is, if the photographic lens has not been reset to the initial position, the extended projection lens 1 is retracted (m<see #130 in Figure 10), so # The process moves to #575 to #585, and retraction control of the photographic lens 1 is performed. That is, the flag ZFMF is reset to O, the ZL motor 14 is driven in reverse (counterclockwise direction),
Il1tI is performed to retract the photographic lens 1 to the Wide side (#575, #580). Then, until the switch S4 is turned on (until the initial position is detected), the ZL motor 14
When the switch S4 is turned on, the ZL motor 14
After applying the brake for 10 msec, turn off the power supply and return to #140 (#585 to #
595〉.

Next, the "exposure control" subroutine will be explained using FIG. 16. In the "exposure control" subroutine, focus is adjusted and the film surface is exposed based on the exposure control value calculated by exposure calculation.

Furthermore, when photographing is performed by emitting light from the strobe 3, the amount of light emitted by the strobe is also controlled.

First, the focal length of the photographic lens 1 is initially fl (35 mm).
) is calculated based on the subject distance Dv (#600). This drive amount N is stored in advance in the memory of the microcomputer 50 in correspondence with the subject distance Dv, and is read out using the subject distance Dv as an address.

Next, it is determined from the value of magnification data OZ whether optical zooming is being performed or not, and if optical zooming is not being performed (OZ=O), the force-singing motor 61 is driven based on the drive i1tlllN mentioned above, and photographing is performed. Adjust the focus of the lens 1 (#605, #620>. If optical zoom is to be performed, calculate the correction value ΔN from the magnification data OZ, add the correction value ΔN, and adjust the focus based on the corrected drive IN. Drive the single motor 61 to adjust the focus of the focusing lens 1 (#610 to #620). Here, the correction value Δ
N is the variation value of the driving IN of the forcing lens caused by changing the focal length.

Next, the actual shutter closing time T1 (seconds) is calculated from the control shutter speed TvcCEV value (
#625). This time T1 is stored in advance in the memory of the microcomputer 50 in correspondence with the control shirt bead Tvc, and is read out using Tvc as an address. When the exposure control time T1 is set, the timer T starts measuring time at the same time as the shutter is opened (#630.#635)
. Then, when timer T measures time T1, flag F
Determine the state of LF, and if flag FLF is reset to O (strobe does not emit light), immediately output a shutter closing signal, wait until the shutter is completely closed, and then #1
30 (see Figure 10) (#640, #6
45, #675, #680). If the flag FLF is set to 1 (S1-Robo light emission), a strobe light emission signal is output, and at the same time timer T is reset to start measuring the light emission time (#650.#655). Next, the presence or absence of a light emission stop signal from the dimming circuit 64 is determined, and if the light emission stop signal is input before the timer T measures time T1, a closing signal is immediately output to close the shutter, and #
Return to 130 (#660.#675.#680
). If the light emission stop signal is not input by the time the timer T measures the time T2, the strobe light emission is stopped at the same time as the timer T measures the time T2, and a closing signal is output to close the shutter, and the process returns to #130. Return (#66
5~#680). Note that the time T2 is the time required for the strobe 3 to fully emit light.

In the above embodiments, the illumination angle of the strobe 3 changed over the entire zoom range, but due to a known mechanism,
The irradiation angle may be changed by zooming (optical zoom) of the photographing lens 1. In this case, the irradiation angle of the strobe 3 does not change even if electronic zoom is performed.
An even image is recorded on the film. Further, in this case, since the flash light enters the film from outside the range specified by the electronic zoom, it is preferable to perform flash light adjustment using the well-known TTL direct photometry. Note that when performing flash dimming using TTL direct metering, the light that has passed through the aperture aperture enters the light receiving means, so unlike when the light receiving means is placed inside the viewfinder, the reference voltage is controlled by the control shirt TASBEAD Tvc. Correction of r becomes unnecessary.

Further, in the above embodiment, the control shutter speed Tvc is always determined to be appropriate using only natural light, regardless of flash photography or natural light photography. However, the invention is not limited to this, and the difference in exposure values ΔEVF is also determined during flash photography (FLF=1), and when ΔEvp>ΔEv, the control shutter speed Tvc is set to the camera shake limit value TVF, so that ΔEVF≦ΔEv. In some cases, the control shutter speed Tvc may be set to a predetermined value (for example, Tvc = Tvp +1) that is larger and faster than the camera shake limit value TVF.When modified in this way, only natural light is used when the flash is transmitted. This will result in underexposure, so
The subject will be properly exposed by the flash light. Further, although the camera of the above embodiment has a built-in strobe 3, the strobe 3 may be attached externally.

〔Effect of the invention〕

As described above, the present invention has optical zoom and electronic zoom, and when the subject brightness is higher than a predetermined brightness value, priority is given to optical zoom in photographing, and the photographing magnification of optical zoom is variable. Since electronic zoom is performed for the insufficient magnification when the range is exceeded, it is possible to take a detailed zoom photo of a relatively bright subject, giving priority to the image quality of the photo print. In addition, when the subject brightness is lower than a predetermined brightness value, priority is given to electronic zoom when taking a photo, and when the variable range of the cropping magnification is exceeded, optical zoom is performed for the insufficient magnification, so it is possible to take pictures of dark subjects. In contrast, exposure control is performed by reducing the aperture value of the carrier lens and using the fastest shutter speed possible, which can reduce shooting errors due to camera shake when taking zoom photos.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an optical system of a camera according to the present invention;
FIG. 2 is a plan view showing the optical system of the camera, FIG. 3 is a perspective view showing the optical system of the finder of the camera according to the present invention, FIG. 4 is a front view of the strobe, and FIG. V-
■Cross-sectional view, FIG. 6 is a Vl-Vl cross-sectional view of FIG. 4, and FIG. 7(a) is a system configuration diagram of the camera according to the present invention.
Figure (b) is a circuit configuration diagram of the light control circuit and photometry circuit, Figure 8 is a program diagram showing the relationship between shutter speed and aperture value, Figure 9 is a main flowchart showing camera operation,
Figure 10 is a flowchart of the "810N" subroutine, Figure 11 is a flowchart of the "finder control" subroutine, Figure 12 is a flowchart of the "exposure calculation" subroutine, Figure 13 is a flowchart of the "display" subroutine, and Figure 14 is a flowchart of the "display" subroutine. Figure 15 shows the display pattern in the viewfinder, Figure 15 is a flowchart of the "zoom lens control" subroutine, Figure 16 is a flowchart of the "exposure control" subroutine, and Figure 17 shows exposure compensation for changes in the focal length of the Ilii shadow lens. FIGS. 18(a) and 18(b) are program diagrams for explaining exposure correction when photographing with natural light at low luminance. A...Camera body, 1...Photographing lens, 2...Finder, 3...Strobe, 4...Objective lens,
5... Eyepiece lens, 6... Condenser lens, 7,
8,9.10...Bolo mirror 11...Field frame display member, 14...Zoom lens motor (ZL motor),
15... Finder motor (F motor), 16...
・Cam plate, 17... Film container, 18... Cam ring, 19.20.21... Gear, 23... Straight guide, 50.57... Microcomputer, 51...
"Motor control circuit, 52.54... encoder, 53
...ZL motor description circuit, 55...Film motor I
II control circuit, 58... DX circuit, 59... display circuit, 60... force single lens motor control circuit, 3
6...Shutter control circuit, 63...Flash device, 64...Dimmer circuit, 65...Photometering circuit, 66...
・Distance measurement circuit, 70 to 72... Display contents, S+ to 85
．． SzT. Sz w-switch.

Claims (1)

[Claims] 1. In a trimming camera that has an electronic zoom that pseudo-changes the photographing magnification by changing the cropping magnification, and an optical zoom that changes the photographic magnification by changing the focal length of the photographic lens, means for detecting, and means for comparing the subject brightness with a predetermined brightness value, and when the subject brightness is below the predetermined brightness value, priority is given to changing the photographing magnification by electronic zoom, and the subject brightness exceeds the predetermined brightness value. and a means for giving priority to changing photographing magnification by optical zoom.