JPH05142628A - Camera provided with special photographing function - Google Patents

Abstract

PURPOSE:To realize photographing to obtain a special effect without forcing a user to execute troublesome operation. CONSTITUTION:This camera is provided with a special photographing execution means 1 by which multiple exposure, where exposure is executed once at the focusing position of a photographing optical system 51 and exposure is continuously executed at least once at the non-focusing position on the closest side of the photographing optical system thereafter, is performed to the same photosensitive part by respectively controlling focusing position changing means 52-55 and an exposure control means 30 when a special photographing mode is selected by a mode selection means 2 and release operation is performed in such a state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a camera having a special photographing function having at least a normal photographing mode and a special photographing mode (soft focus photographing mode) as a photographing mode. It is a thing.

[0002]

2. Description of the Related Art In general photography, it is usual to perform exposure based on an appropriate exposure control value when a focal position of a photographing optical system is at a focus position. However, with the diversification of photographic expressions, various special shooting effect methods have been created. Among them, the soft focus shooting is most effective in photographing a person (portlet) or a still life.

The soft focus shooting is roughly classified into
A method of using a filter for soft focus shooting,
There is a method of using a lens for soft focus shooting,
The former method of using a soft focus filter is to install a skylight filter coated with oil and fat such as petrolatum immediately in front of the shooting lens, or to use a filter with fine unevenness in front of the shooting lens. It is known how to attach to. The soft-focus photographing lens used in the latter is a photographing optical system which produces a fantastic effect by generating a light flare around a subject image due to high-order spherical aberration.

In addition, recently, due to an advanced design technique using a computer, the lens has an optical system which does not have the same aberration as a general lens in a normal use state, but at least one lens in the optical system has at least one lens. There is also invented a lens for a soft-focus photographing optical system that generates high-order spherical aberration by moving the lens in the optical axis direction.

In addition to the above-described soft focus photographing method, as a method of performing soft focus photographing using a normal camera and lens, a subject image focused on the same frame of film is imaged. There is known a method using multiple exposure in which both a subject image in a non-focus state and a subject image in a non-focus state are captured.

The method of attaching the skylight filter coated with oil and fat such as petrolatum just before the photographing lens is inconvenient for storing and carrying the filter.
Since the filter must be attached depending on the presence or absence of the soft focus effect, it is unsuitable for use in casual snap photography outdoors.
In addition, a method of attaching a filter having a fine concavo-convex process immediately in front of the photographing lens is also an inconvenient method for distinguishing between general photographing and soft focus photographing.

In this respect, if the lens can be switched between the general photographing and the soft focus photographing, there is no special carrying object and no complicated mounting work, and the general photographing and the soft focus photographing can be performed. Since it is possible to switch between shooting and shooting instantly, it is much more convenient than a filter, but the advantage of a single-lens reflex camera that "the lens can be replaced" is significantly impaired. In addition, since the aperture is effective only near the open position because the high-order spherical aberration is used, the illuminance of the subject is high outdoors and the effect is not exhibited in a place where the aperture must be narrowed down.

[0008]

It can be said that the soft focus photographing by the multiple exposure is capable of overcoming the above-mentioned various drawbacks. However, even in soft focus shooting by this multiple exposure, there are the following problems.

First, the complexity of camera operation becomes a problem.
That is, first, the exposure value must be set in the multiple exposure mode, and thereafter, the exposure value for each multiplex shooting must be determined based on the photometric value so that the multiple exposure effect is appropriate, and the exposure correction must be performed. Moreover, in order to produce the optimum soft focus effect, the amount of out-of-focus during unfocused shooting, the exposure distribution between in-focus shooting and unfocused shooting, and the number of unfocused shots There are many items that must be taken into consideration.

If the defocus amount for each multiplex (photographing) at the time of non-focus photographing is too small, the soft focus effect hardly appears, and even if it is too large, the non-focus image is not obtained. The contours of the
The dust effect does not appear. Also, if another subject exists at the position where the lens is driven for out-of-focus shooting, the other subject will be in focus and the soft focus effect will not appear in a part of the shooting screen. You must also pay attention to the direction in which the lens is driven for focusing.

Further, the operation after the completion of the first exposure of the multiplex (photographing) (the start of the exposure to the second multiplex) must be performed extremely quickly in order to prevent the blurring of the object.

As described above, taking a photograph having a soft focus effect by this multiple exposure method requires abundant experience, knowledge and feeling, which is a difficult operation method for beginners. ..

In view of the above points, an object of the present invention is to provide a camera with a special photographing function which can realize photographing for obtaining a special effect without forcing a user to perform a complicated operation. is there.

[0014]

According to the present invention, the special photographing mode is selected by the mode selecting means, and the release operation is performed in this state to change the focus position and the exposure control means. Special photography execution that controls each of them, and continuously and multiple exposures of the same exposure area at the in-focus position of the shooting optical system and at least one exposure at the close-side non-focus position of the shooting optical system Means are provided.

[0015]

[Operation] When shooting with the special shooting mode selected,
At least one imprint (exposure) at the in-focus position of the photographic optical system and at least one imprint at the close-side non-in-focus position are automatically and continuously performed on the same photosensitive region. There is.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a schematic structure of a camera capable of photographing a special effect according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a microcomputer (hereinafter referred to as a microcomputer) for controlling each processing of the camera,
2 is a photographing mode dial for inputting a photographing mode, 3 is an A / D converter for taking the output signal of the photometric sensor 23 for measuring the subject brightness into the microcomputer 1, and 4 is the AF unit 60.
A / D converter for taking in the output signal from the line sensor in the microcomputer 1 to the microcomputer 1, SW1 is a start switch which is turned on at the first stage in conjunction with the pressing of the release button, SW2
Is a release start switch that is turned on at the second stage in conjunction with pressing the release button, SW3 is a back lid open / closed detection switch that detects opening / closing of the back lid of the camera, and SW4 is a film in the camera's patrone chamber. Is a film loading detection switch for detecting that the camera is loaded, 23 is a photometric sensor for measuring the subject brightness, 30 is a shutter unit, 40 is a mirror unit, 50 is a photographing lens unit, and 51 is a focus position adjustable A photographic lens, 52 is a focus adjustment motor,
Reference numeral 53 is an encoder for detecting the drive amount of the focus adjusting motor 52, 54 is an electromagnetic drive diaphragm device for adjusting the amount of light transmitted through the lens, 55 is a lens unit control circuit, and 60 is for detecting the focus position described above. It is an AF unit.

FIG. 2 is a diagram showing a photometric system and an AF system of the camera.

In FIG. 2, 21 is a finder pentaprism, 22 is a photometric optical system for forming an image on a photometric sensor 23, 31 is a focal plane shutter drive device, and 32 is a focal plane shutter tip. Curtain, 33
Is a rear curtain of the focal plane shutter, 41 is a mirror rotated by a motor (not shown) for driving (raising and lowering) a main mirror and feeding a film, which will be described later, and for charging the shutter. Drive shaft, 42 is finder part and AF
Semi-transparent main mirror for splitting the optical path into parts and
Reference numeral 43 is a sub-mirror for guiding the AF luminous flux whose optical path is divided to the AF unit 60.

Explaining the exposure sequence of the camera with reference to FIG. 2, the release start switch SW2 is operated by pressing the release button up to the second step.
Is turned on and the release sequence is started.

That is, the microcomputer 1 drives a motor (not shown) to raise the main mirror 42 to the finder side (via the mirror drive shaft 41). At this time, as the main mirror 42 rises, the sub-mirror 43 is changed to the main mirror 42.
It is folded to the back side of and does not obstruct the optical path between the taking lens 51 and the film surface. When the main mirror 42 has finished rising to the finder side, the microcomputer 1
The focal plane shutter drive device 31 has a focal plane.
The front shutter 32 of the shutter is instructed to travel. This allows
The multiplex first exposure is started. Then, after the shutter time elapses based on the exposure calculation, the microcomputer 1 instructs the focal plane shutter drive device 31 to run the rear curtain 33 of the focal plane shutter. This completes the multiplex first exposure on the film.

Next, the microcomputer 1 drives the motor to lower the main mirror 42 which has been raised to the finder side. At this time, the sub-mirror 43 folded on the back side of the main mirror 42 returns to its original position as the main mirror 42 descends. In addition, simultaneously with the lowering of the main mirror 42, the shutter drive spring is charged. Then, the photographing lens 51 is driven to defocus the focus position by a predetermined amount to prepare for the exposure of the second multiple frame. Next, the motor is driven to raise the main mirror 42 to the finder side. At this time, if it is necessary to shorten the processing time, it is possible to drive the taking lens 51 and the main mirror 42 at the same time. After that, when the driving of the photographing lens 51 and the rising of the main mirror 42 are completed, the shutter driving device 31 is instructed to run the front curtain 32 of the focal plane shutter, as in the first exposure. As a result, the multiple second exposure is started. After the elapse of the designated time, the microcomputer 1 instructs the focal plane shutter driving device 31 to drive the rear curtain 33 of the focal plane shutter. This completes the multiple second exposure of the film. Next, the motor is driven to lower the main mirror 42 that has been raised to the finder side. At this time, the sub-mirror 43 folded on the back side of the main mirror 42 returns to the original position as the main mirror 42 descends. At the same time when the main mirror 42 descends, a shutter driving spring is charged.

As described above, the first and second multiple exposures for one frame are completed, and then one film is fed to prepare for photographing the next frame.

FIG. 3 is a diagram for assisting in explaining the operation at the time of the soft focus shooting described above.

FIG. 3A is a diagram showing a state in which the subject is focused and imaged on the film surface, that is, the first multiple photographing state, and a sharp subject image is projected on the film surface.

FIG. 3B is a diagram showing a state in which the subject is out of focus and is projected on the film surface, that is, a second multiple shooting state. A blurred subject image is projected on the film surface. ..

FIG. 3C is a diagram for explaining the subject image finally exposed on the film, in which the multiple sharp object image of the first time and the multiple blurred object image of the second time are combined. The soft focus effect appears.

FIG. 4 shows a timing chart at the time of the above soft focus photographing.

Here, the main mirror -4 is produced by reversing the motor.
The ascent and charge of 2 and the ascent will be described by taking as an example a camera that feeds the film in the forward direction. Further, the diaphragm device of this camera is an electromagnetic drive in which the diaphragm is stopped by energizing the stepping motor, and then the diaphragm state is maintained when the energization is OFF, and the diaphragm is opened by reenergizing. It is a diaphragm device. Also, the focal play
The front and rear curtains of the shutter are mechanically held in the standby state of the camera, and the magnets are energized and attracted and held before the mechanical holding disappears.
It is assumed that the shutter mechanism is such that the energization is turned off at the traveling start timing.

The following is a description based on the timing chart of FIG.

When the activation switch SW1 is turned on in association with the pressing of the release button, the photometry and distance measurement operations are started, and then the lens drive to the position based on the distance measurement calculation result is started. After focusing, when the release start switch SW2 is turned on to enter the exposure sequence, the motor reverse rotation is started and the main mirror 43 starts to rise. At this time, the shutter front curtain magnet and the rear curtain magnet are energized to attract and hold the armature, and then the mechanical holding state in which the traveling of the front curtain 32 and the rear curtain 33 is prohibited is released. .. When the rise of the main mirror 43 is completed, the signal MRUP indicating the mirror-up state is turned on (“L”), the diaphragm signal EMD is set to “H”, and the electromagnetically driven diaphragm described above operates.

Next, the energization to the shutter front curtain magnet is turned off, whereby the front curtain 32 runs, and after the shutter time based on the exposure calculation elapses, the energization to the shutter rear curtain magnet is turned off. As a result, the rear curtain 33
Runs. When the signal CN2 indicating the completion of running of the trailing curtain 33 becomes "H", the motor is reversed again, the main mirror 43 starts descending, and the signal MRUP becomes OF.
It becomes F (“H”). Simultaneously with this, shutter charge is performed, and then the signal CN2 indicating the completion of the trailing curtain travels to "L". The reverse rotation of the motor is performed until the charge completion signal SCH of the shutter is generated ("H").

During the above shutter charge, the photographing lens 51 is driven by a predetermined drive amount for the second multiple out-of-focus photographing, and when the photographing lens 51 completes the predetermined driving,
Subsequently, the motor is reversed again to enter the second exposure sequence of multiplex.

At this time, which of the generation of the shutter charge completion signal SCH and the completion of the drive of the photographing lens 51 comes first depends on the lens drive amount and the drive speed, and therefore depends on the situation. Here, since the timing chart is when the lens driving is completed later than the generation of the shutter charge completion signal SCH, the second exposure sequence is waited for until the driving of the photographing lens 51 is completed. to go into.

When entering the second exposure sequence, the motor is first reversed, whereby the main mirror 43 starts to rise, and when the mirror up is completed, the signal MRUP indicating the mirror up state is turned on. To be done. Next, the front curtain 32 of the focal plane shutter runs, and the rear curtain 33 runs after the shutter time based on the exposure calculation has elapsed. And
The signal CN2 indicating that the trailing curtain 33 has finished traveling is turned "H" ON
Then, the motor is reversed again, the main mirror 43 starts descending, and the signal MRUP is turned off. At this time, the above-mentioned electromagnetically driven diaphragm, which is still narrowed during the first multiple exposure, is re-energized to open the diaphragm. Then, the shutter charge is performed at the same time as the mirror down, and then the signal CN2 indicating the completion of the trailing curtain travel becomes "L". The reverse rotation of the motor is carried out until the charge completion signal SCH of the shutter is generated, as described above.

As described above, the release sequence of the soft focus shooting is completed, the motor is rotated in the normal direction, and one frame of the film is fed.

FLMV in FIG. 4 is a pulse signal generated when the film is being fed, and after the predetermined number of times is counted, the energization of the motor is duty-controlled to be broken. The motor is stopped and ready for the next shooting.

Here, the lens drive amount for the second out-of-focus photographing of the multiplex will be described.

The lens drive amount calculation formula is as follows.

P = {(n × F × σ) / s} / d where P is the lens drive amount (lens drive pulse number), F is the aperture value, σ is the minimum circle of confusion, s is the sensitivity of the lens, d is the lens feed pitch. n is the required defocus magnification, and the value of this n determines the defocus amount in the second multiplex, and affects the degree of the soft focus effect. In this embodiment, “n = 50” is set as described later.

As for the lens driving direction for the second out-of-focus photographing of the multiplex, the lens is first driven to the close side. This is because there is a low probability that another subject exists closer to the main subject. However, as a result of driving the lens, if the predetermined drive amount calculated by the above formula is not satisfied,
After striking the closest end, the lens is re-driven by a predetermined drive amount toward the ∞ end. At this time, the predetermined drive amount calculated by the above equation is compared with the maximum defocus amount of each lens, and in some cases, even if the result of driving the lens does not satisfy the predetermined drive amount, You may stop at.

Next, the exposure distribution at the time of the multiplex first in-focus shooting and the multiplex second out-of-focus shooting will be described.

In normal multiple shooting, the exposure ratio is "1: 1" because all the exposures at each time are generally uniform, but the exposure ratio is not limited to "1: 1" for various special effects. The degree of soft focus effect can be changed by selecting various exposure ratios. If the exposure amount of the second multiple exposure is made larger than the exposure amount of the first multiple exposure, the in-focus image tends to be thin, and the degree of the soft source effect tends to increase as a whole. It is necessary to select an appropriate exposure ratio so as not to produce a defocused photograph, but since it is not directly related to the present invention, no further description will be given.

Further, by combining various photographing elements described above, it is possible to arbitrarily select the degree of the soft-circus effect in a state of being set in the soft-circus photographing mode in this embodiment.

FIG. 5 is a flow chart showing the operation of the microcomputer 1 of the camera in this embodiment shown in FIG. 1, which will be described below. "Step 1001" I / O (microcomputer peripheral IC) is reset and memory is initialized. At this time, the operation continuation timer (not shown) is also reset. "Step 1002" It is determined from the state of the back lid opening / closing switch SW3, the film loading switch SW4, etc. that the back lid is closed and the film is loaded, and whether it is before prewinding. If it is before prewinding, step 1
Proceed to 003, and if prewind is not necessary, step 10
Go to 05. [Step 1003] The film is wound into a film winding spool until the tension of the film is detected. That is, all the films are once wound on a film winding spool. Further, during the prewind operation, the signal from the film moving means is counted to detect and store the number of filmable frames (specified frame number) of the film. Here, the above-mentioned film tension detection is carried out by not generating a signal from a film movement detection means (not shown) for detecting movement of the perforation of the film for a certain period of time. "Step 1004" Film speed information is read and stored by a DX code reading means (not shown). At this time,
If the film is not compatible with DX code, the film sensitivity will be entered by the photographer, but this value will be stored. "Step 1005" The shooting mode selected by the shooting mode dial 2 is read and the current shooting mode is stored. [Step 1006] It is determined whether or not the release button has been pressed to the first step and the activation switch SW1 has been turned on. As a result, if it is ON, step 1
007, if it remains OFF, step 1013
Go to. "Step 1007" Reset the operation continuation timer,
Extend operating time. [Step 1008] A part of the image formed on the finder by the taking lens 51 passes through the pentaprism 21 and is then guided by the photometric optical system 22 to the photometric sensor 23. In this case, the microcomputer 1 detects the photometric sensor 23. After the output is captured and A / D converted, it is stored as photometry. [Step 1009] The shutter speed and the aperture value are calculated and stored based on the photometric value stored in step 1008, the film sensitivity information stored in step 1004, and the shooting mode stored in step 1005. [Step 1010] The image that has passed through the taking lens 51 passes through the main mirror 42, is guided to the AF unit 60 by the sub mirror 43, and is divided into a pair of images by the pupil dividing means. The microcomputer 1 takes in the output signal of the line sensor 61, performs A / D conversion, and stores it as an AF signal.
After that, the microcomputer 1 calculates a defocus amount by performing a correlation calculation or the like on this AF signal. [Step 1011] Whether or not the focus is achieved is determined from the defocus amount calculated in the above step 1010. If the focus is achieved, the process proceeds to step 1015. If not, the process proceeds to step 1012. [Step 1012] The lens drive amount is calculated from the defocus amount in step 1010, and the control circuit 55 in the photographing lens unit 50 is caused to perform the focus adjustment operation according to the calculated amount. The control circuit 55 drives the focus adjustment motor 52 in accordance with the lens driving amount sent thereto, and controls the positioning of the taking lens 51 based on the output signal from the encoder 53. Then, the process returns to step 1002.

If it is determined in step 1006 that the start switch SW1 is off, the process proceeds to step 1013 as described above. [Step 1013] The state of the operation continuation timer is determined, and if the timer reaches a predetermined count, step 1
The process proceeds to 014, and if the predetermined count has not been reached, the process returns to step 1002. [Step 1014] The DC / DC converter (not shown) is stopped, or the energization of each actuator is stopped to stop the camera system.

If it is determined in step 1011 that the object is in focus, the process proceeds to step 1015 as described above. [Step 1015] Here, it is determined whether or not the release start switch SW2 is turned on. If it is turned on, the process proceeds to step 1016 to enter the release sequence, and if it is turned off, the process returns to step 1002. [Step 1016] The traveling start timing of the front curtain 32 and the rear curtain 33 of the focal plane shutter is set based on the shutter speed and the aperture value stored in the above step 1009, and similarly, the electromagnetic waves in the photographing lens unit 50 are set. The drive amount of the drive diaphragm device 54 is set. "Step 1017" The motor (not shown) is reversed to rotate the mirror drive shaft 41 and raise the main mirror 42 to the finder side. At this time, the sub-mirror 43 rises in conjunction with the main mirror 42, and finally the main mirror.
Folded to the 42 side. [Step 1018] The electromagnetically driven diaphragm device 54, which was in the open state for observing the subject image with the finder, is driven by the diaphragm drive amount set in step 1016 to bring it into a predetermined diaphragm state for photographing. [Step 1019] The shutter drive control is performed according to the traveling start timing of the front curtain 32 and the rear curtain 33 of the focal plane shutter set in the above step 16, and a subject image is imprinted on the film. [Step 1020] The photographing mode stored in step 1005 is discriminated. If the photographing mode is the soft focus photographing mode, the process proceeds to step 1027. If the photographing mode is the normal photographing mode, the step is executed. Proceed to 1021. "Step 1021" The motor (not shown) is reversed to rotate the mirror drive shaft 41 in the opposite direction to the above, and the main mirror 42 is lowered to its original position. At this time, the sub-mirror 43 folded on the main mirror 42 returns to the original position in conjunction with the main mirror 42. Further, as the main mirror 42 descends, the shutter is charged. [Step 1022] The electromagnetically driven diaphragm device 54 is driven so that the electromagnetically driven diaphragm device 54 narrowed down in step 1018 is opened. "Step 1023" If a film is loaded, the process proceeds to step 1024, and if no film is loaded, the process returns to step 1002. [Step 1024] The film feeding device (not shown) is driven until the signal from the film movement detecting means (not shown) for detecting the movement of the film perforation reaches one frame, and the film is moved by one frame. To send. [Step 1025] The specified number of frames of the film stored in step 1003 is compared with the current number of frames to determine whether or not the film is finished. As a result, if the film has not ended, the process returns to step 1002, and if the film has ended, the process proceeds to step 1026. [Step 1026] A film end warning is issued to the photographer to prohibit the operation other than the film exchange operation, and the process returns to step 1002.

If the soft focus shooting mode is selected in step 1020, the process proceeds to step 1027 as described above. [Step 1027] Here, the lens drive amount (lens drive pulse number) such that the defocus amount becomes a predetermined amount is calculated. For example, the required defocus ratio n is set to "5.
0 ”, aperture value F is“ 2.8 ”, minimum circle of confusion σ is“ 0.035 m
m ”, lens feed pitch d is“ 0.005 mm ”, and lens sensitivity s is“ 1.0 ”, the minimum circle of confusion σ is“ 0.035 m
When it is desired to expose the first multiplex at the in-focus position and the second multiplex by a predetermined amount (50.F..sigma.) in the state of "m" and the aperture value F of "2.8", P = { The calculation of (n × F × σ) / s} / d = {(50 × 2.8 × 0.035) /1.0} /0.005=875 [pulse] is executed to calculate the lens drive amount. [Step 1028] The focus drive amount of the taking lens 51 calculated in the above step 1027 is instructed to the control circuit in the taking lens unit 50. "Step 1029" The motor (not shown) is reversed to rotate the mirror drive shaft 41 and lower the main mirror 42 to its original position. At this time, the sub-mirror 43 folded on the main mirror 42 returns to the original position in conjunction with the main mirror 42. Further, as the main mirror 42 descends, the shutter is charged. "Step 1030" The motor (not shown) is reversed to rotate the mirror drive shaft 41 in the opposite direction to the above step 1029, and the main mirror 42 is raised to the finder side. At this time, the sub-mirror 43 moves up in conjunction with the main mirror 42 and is finally folded to the main mirror 42 side. [Step 1031] It is determined whether or not the taking lens 51 driven in step 1028 is stopped, and if not stopped, the process stays in this step, and if it is confirmed that the shooting lens 51 is stopped, the process proceeds to step 1032. [Step 1032] It is determined whether or not the taking lens 51 driven in step 1028 can be driven by the predetermined amount (predetermined defocus amount) calculated in step 1027. It is considered that the edge has been hit, and the routine proceeds to step 1033, and when the drive for the predetermined amount is performed, the routine proceeds to step 1038. [Step 1033] Let P be the lens drive amount (predetermined amount) calculated in step 1027, Pr be the drive amount that the taking lens 51 was actually able to drive, and D be the maximum defocus amount of the taking lens 51. If either of the conditions is satisfied, it is determined that it is not necessary to invert the photographing lens 51.

(1) Pr> 0.70 × P (2) Pr> 0.35 × D / d That is, the actual lens driving amount Pr is a predetermined amount P of “70”.
% ”Or more, or the actual lens drive amount Pr is“ 35 ”of D / d.
% ”Or more (D / d represents the maximum number of drive pulses), it is determined that it is not necessary to reverse the photographing lens 51. The condition (1) means that the effect of soft focus imaging can be obtained when Pr reaches "70%" of P, and the condition (2) means that Pr is "the maximum driving pulse number". 35
%, It means that there is a low probability that a desired defocus amount can be obtained even by the inversion driving. [Step 1034] It is determined whether or not the inversion driving of the photographing lens 51 is unnecessary. If not necessary, the process proceeds to step 1038, and if the inversion driving is necessary, the process proceeds to step 1035. “Step 1035” From the lens driving amount P calculated in step 1027 and the driving amount Pr actually driven by the photographing lens 51, the reversal driving amount Px is “Px = − (P + P
r) ”. [Step 1036] The inversion drive amount Px of the taking lens 51 calculated in the above step 1035 is instructed to the control circuit 55 in the taking lens unit 50 to start the inversion driving of the taking lens 51. [Step 1037] It is determined whether or not the taking lens driven in the above step 1036 is stopped, and if not stopped, the process stays in this step, and when it is confirmed that the shooting lens is stopped, the process proceeds to step 1038. “Step 1038” Here, the above step 1009
The traveling start timings of the front curtain 32 and the rear curtain 33 of the focus plane shutter are set on the basis of the shutter speed and the aperture value stored in the above step 3. At the same time, the drive amount of the electromagnetically driven diaphragm device 54 in the photographing lens unit 50 is set. Set. Thereafter, the soft focus photographing mode is temporarily released and the process returns to step 1018.

The above is a description of a series of operations. Here,
The calculation of the exposure amount in step 1009 will be described in more detail.

There are many opinions about the definition of the proper exposure amount, but "0.
075 to 0.1 [lux · sec] ”is general.
Now, considering "0.08 [lux · sec]" as the proper exposure amount, the product of the exposure amount H and the film sensitivity S is H × S = 8.0, and the exposure amount H is the product of the image plane illuminance I and the effective exposure time T. Therefore, there is a relational expression H = I × T = k × (B × T / F ² ), where B is the subject brightness, F is the aperture value, and k is the coefficient of the lens transmittance. The EV value can be calculated as EV = log ₂ (F ² / T) = log ₂ {(k × B × s) /8.0 from the relational expression of the exposure amount H and the definition expression of the EV value. The subject brightness B is obtained as a photometric value by the photometric sensor 23. After that, from the EV value obtained by the above-mentioned calculation, if the photographing mode is a normal photographing mode, the combination of the shutter speed and the aperture value is set according to a predetermined program diagram, and the softfo
In the case of the dust shooting mode, the combination of the shutter speed and the aperture value is set according to the program diagram dedicated to this. In the soft focus shooting mode, the shutter speed and aperture value of the first multiplex and the second multiplex are set in accordance with the soft source effect so that proper exposure can be obtained with a plurality of exposures.

According to the present embodiment, only by setting the photographing mode of the camera to the soft focus photographing mode, the multiple exposure function is automatically set and the multiple exposure effect is appropriate. Therefore, the exposure value is determined for each multiplex shooting based on the photometric value, and the exposure is automatically adjusted.In addition, the out-of-focus amount during out-of-focus shooting to produce the optimum sophofocus effect is also achieved. Since it is set automatically, it does not require abundant experience, knowledge and feeling, and even beginners can easily take photographs with a soft focus effect.

Moreover, at the time of non-focusing photography in which the lens is driven to the close-up side, it is unlikely that a subject other than the main subject will be present at the close-up side, so there is a possibility that a focused image other than the main subject will be captured. Since there is almost no image, it is possible to give a photograph having a beautiful soft focus effect.

(Modification) In this embodiment, the number of times of multiplex photographing is two times as an example, but multiplex 1 in the in-focus state is performed.
After the second time, the imprinting may be performed twice or more in the non-focused state. Also, in this case, the out-of-focus default
The amount of waste may be changed each time.

[0055]

As described above, according to the present invention,
When the special photographing mode is selected by the mode selecting means and the release operation is performed in this state, the focus position changing means and the exposure control means are respectively controlled, and the same photosensitive portion is used for photographing. The special photographing mode is selected by providing a special photographing executing means for successively performing multiple exposure of the exposure at the in-focus position of the optical system and at least one exposure at the close-side non-focus position of the photographing optical system. At the time of shooting, at least 1 at the in-focus position of the shooting optical system on the same photosensitive area
At least 1 at the imprint position and the near out-of-focus position
The imprinting is performed automatically and continuously.

Therefore, it is possible to realize photographing for obtaining a special effect without forcing the user to perform a complicated operation.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a camera according to an embodiment of the present invention.

FIG. 2 is a diagram showing a photometric system and an AF system of the camera of FIG.

FIG. 3 is a diagram for explaining an operation at the time of soft-focus shooting in an embodiment of the present invention.

FIG. 4 is a timing chart for soft-focus shooting.

5 is a flowchart showing the operation of the microcomputer of FIG.

[Description of Symbols] 1 Microcomputer 2 Photographing mode dial 23 Photometric sensor 30 Shutter unit 31 Focal plane shutter driving device 32 Focal plane shutter front curtain 33 Focal plane shutter rear curtain 42 Main mirror 51 Photographing lens 52 Focusing Motor 53 Encoder 54 Electromagnetic Drive Diaphragm Device 55 Control Circuit

Claims (1)

[Claims] 1. A focus detecting means for detecting a focus state of a subject, a focus position changing means for changing a focus position of a photographing optical system based on a signal from the focus detecting means, and a photometric means for measuring a subject brightness. , An exposure control means for performing exposure control based on a photometric value from the photometric means, and a mode selecting means for selecting a photographing mode.
In a camera with a special photographing function having at least a normal photographing mode and a special photographing mode, the special photographing mode is selected by the mode selecting means, and the release operation is performed in this state. The focus position changing unit and the exposure control unit are controlled by the exposure control unit, and the exposure at the in-focus position of the photographing optical system and the at least one non-focus position of the photographing optical system on the same light-sensing portion are controlled by A camera with a special photographing function, which is provided with a special photographing executing means for successively performing multiple exposures of each of the exposures.