JP2008275826A - Camera system and electronic camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera system which appropriately performs blur suppressing control. <P>SOLUTION: The camera system 10, 50 is equipped with: an imaging member 13 picking up a subject image through a photographic optical system 51; shake detection means 55a and 55b detecting rocking; vibration-proof means 54 and 101 (Fig.2) driving a vibration-proof optical system 53 or the imaging member in accordance with the detected rocking, so as to suppress the shaking of the subject image; a brightness detection means 19 detecting the brightness of a subject; an exposure arithmetic operation means 101 (Fig.2) deciding an exposure parameter including at least shutter speed by using brightness information detected by the brightness detection means 19; and a control means 101 (Fig.2) controlling the vibration-proof means 54 and 101 (Fig.2) so as to restrict the drive range of the vibration-proof optical system 53 or the imaging member in accordance with the shutter speed arithmetically calculated by the exposure arithmetic operation means 101 (Fig.2). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a camera system and an electronic camera.

  An anti-vibration control technique for reducing the influence of shaking generated in a camera due to camera shake is known (see Patent Document 1). In Patent Document 1, an angular velocity sensor that detects a shake in the pitch direction and an angular velocity sensor that detects a shake in the yaw direction are disposed, and an optical member is driven in accordance with the detection output from both sensors, thereby providing an image sensor. A technique for suppressing shaking of a subject image formed on the top is disclosed.

JP-A-7-203285

  In the prior art, for example, even when the influence of camera shake is not a concern as in shooting using a high shutter speed, the optical member is driven according to the detection output from the sensor.

(1) A camera system according to the present invention drives an image pickup member that picks up a subject image through a shooting optical system, a shake detection unit that detects a swing, and a vibration-proof optical system or an image pickup member in accordance with the detected swing. And an anti-vibration unit that suppresses shaking of the subject image, a brightness detection unit that detects the brightness of the subject, and exposure parameters including at least the shutter time using the brightness information detected by the brightness detection unit. An exposure calculation means for determining and a control means for controlling the image stabilization means so as to limit the drive range of the image stabilization optical system or the imaging member according to the shutter time calculated by the exposure calculation means. .
(2) In the camera system according to claim 1, the control means includes a vibration isolating optical system in which the shutter time calculated by the exposure calculating means is shorter than the camera shake limit second time as compared with the case where the camera shake limit time is exceeded. Alternatively, the image stabilization means can be controlled so as to narrow the driving range of the imaging member.
(3) In the camera system according to claim 2, it is preferable that the camera shake limit time corresponds to 1 / (focal length).
(4) In the camera system according to claim 3, the control means can also control the vibration isolation means so as to narrow the driving range when the distance to the subject is less than a predetermined distance.
(5) In the camera system according to (1), the control means is adapted to prevent vibration when the amount of movement of the subject corresponding to the shutter time determined by the exposure calculation means is smaller than a predetermined value, compared to when exceeding the predetermined value. It is also possible to control the image stabilization means so as to narrow the drive range of the optical system or the imaging member.
(6) The camera system according to claim 5 further includes a focus detection unit that performs focus detection of the photographing optical system with respect to the subject, and a tracking unit that tracks the subject using focus detection information from the focus detection unit. Also good. In this case, the amount of movement of the subject may be an amount by which the subject tracked by the tracking unit moves in a predetermined time.
(7) In the camera system according to claim 1, when the drive amount of the image stabilization optical system or the imaging member determined according to the swing detected by the image stabilization unit exceeds the drive range, the control unit Instruct the exposure calculation means to set the shutter time that has been changed so as to be within the drive range, and set the image stabilization means so as to redetermine the drive amount of the image stabilization optical system or imaging member according to the changed shutter time. It can also be controlled.
(8) An electronic camera according to the present invention includes an image sensor that captures a subject image through a photographing optical system, a shake detection unit that detects a swing, and an image signal captured by the image sensor in accordance with the detected swing. By performing image processing, a correction unit that corrects the shake of the subject image, a brightness detection unit that detects the brightness of the subject, and at least the shutter time using the brightness information detected by the brightness detection unit. Exposure calculation means for determining an exposure parameter to be included, and control means for controlling the correction means so as to limit the correction amount in accordance with the shutter time calculated by the exposure calculation means.

  According to the present invention, blur suppression control can be performed appropriately.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining a main configuration of a single-lens reflex electronic camera system according to an embodiment of the present invention. In FIG. 1, an interchangeable lens 50 that is detachable from the camera body 10 is attached.

  The interchangeable lens 50 includes a photographic lens group 51, an anti-vibration lens 53, a diaphragm 52, a lens driving member 54, and shake sensors 55a and 55b that detect camera system shake. The shake sensor 55 a detects a shake in the yaw direction of the camera system and transmits a detection signal to the camera body 10. The shake sensor 55 b detects a shake in the pitch direction of the camera system and transmits a detection signal to the camera body 10.

  The anti-vibration lens 53 is configured to move forward and backward in a direction orthogonal to the optical axis direction by the lens driving mechanism 54. By driving the anti-vibration lens 53 so as to cancel the influence of camera shake, the relative shaking of the subject image on the image sensor 13 due to the swinging of the interchangeable lens 50 (that is, the camera system) can be suppressed. A drive control signal for the lens drive mechanism 54 is transmitted from the camera body 10.

  Light from the subject incident on the interchangeable lens 50 is incident on the camera body 10 via the photographing lens group 51, the image stabilizing lens 53 and the diaphragm 52. The subject light incident on the camera body 10 is guided to the upper finder by a quick return mirror (hereinafter referred to as a main mirror) 11 positioned as indicated by a broken line before being released, and forms an image on the diffusion screen 14. A part of the subject light incident on the camera body 10 is reflected downward by the sub mirror 21 and also enters the distance measuring element 22. The distance measuring element 22 constitutes an AF module 107 (FIG. 2), which will be described later, and is used at the time of focus detection (AF processing) for detecting the focus adjustment state by the interchangeable lens 50.

  The subject light imaged on the diffusing screen 14 further enters the pentaprism 15 via the condenser lens 20. The pentaprism 15 guides the incident subject light to the eyepiece 16, and also guides part of it to the photometric optical system 17. The light incident on the photometric optical system 17 forms a subject image on the photometric sensor 19 via the photometric lens 18. The photometric sensor 19 outputs a photoelectric conversion signal for photometric processing corresponding to the brightness of the subject image.

  After the release, the main mirror 11 rotates to the position indicated by the solid line, and the subject light is guided to the image sensor 13 via the shutter 12 to form a subject image on the imaging surface. The image sensor 13 is configured by a CCD image sensor or the like provided with a plurality of photoelectric conversion elements corresponding to pixels. The image sensor 13 captures a subject image formed on the imaging surface, and outputs a photoelectric conversion signal for photographing corresponding to the brightness of the subject image.

  FIG. 2 is a block diagram illustrating a circuit configuration of the camera body 10 described above. The timing generator (TG) 134 generates a timing signal in response to an instruction sent from the system control unit 101, and sends the timing signal to each of the driver 133, the AFE (Analog Front End) circuit 131, and the A / D conversion circuit 132. Supply. The driver 133 generates a drive signal for accumulating charges in the image sensor 13 and sweeping out the accumulated charges using the timing signal, and supplies the generated drive signal to the image sensor 13.

  An AFE (Analog Front End) circuit 131 performs analog processing (such as gain control) on a photoelectric conversion signal (accumulated charge) output from the image sensor 13. The A / D conversion circuit 132 converts the image pickup signal after analog processing into a digital signal.

  The system control unit 101 is configured by a microcomputer or the like. The system control unit 101 receives a signal output from each block described later, performs a predetermined calculation, and outputs a control signal based on the calculation result to each block. The system control unit 101 is also configured to perform an image stabilization control calculation that suppresses the influence of camera shake, that is, a process of calculating a drive control signal for the lens drive mechanism 54 based on a shake detection signal from the interchangeable lens 50.

  The half-push switch 112 and the full-push switch 113 each output an ON signal to the system control unit 101 in conjunction with a pressing operation of a release button (not shown). The ON signal from the switch 112 is output when the release button is pressed down to about half of the normal stroke, and the output is canceled when the half stroke is pressed down. The ON signal from the switch 113 is output when the release button is pushed down to the normal stroke, and the output is released when the normal stroke push-down operation is released.

  The operation member 106 outputs setting / switching signals according to various settings and selection operations to the system control unit 101. The operation member 106 includes an operation member for setting an imaging sensitivity (ISO sensitivity), an exposure calculation mode, and the like.

  The AF module 107 includes the distance measuring element 22 shown in FIG. The AF module 107 detects the focus adjustment state (defocus amount) by the interchangeable lens 50 using the detection signal from the distance measuring element 22, and calculates the movement amount of the focus lens constituting the photographing lens group 51 according to the detection result. To do. A signal indicating the amount of movement of the focus lens is transmitted to the interchangeable lens 50 via the system control unit 101 and the lens communication unit 109.

  The AE module 108 includes the photometric sensor 19 of FIG. The AE module 108 calculates the subject brightness using the detection signal from the photometric sensor 19. The AE module 108 further performs a known exposure calculation using the set imaging sensitivity, lens information (aperture value) received by the lens communication unit 109, the calculated subject brightness, and the like, and determines the control exposure. The exposure calculation mode is performed in an exposure calculation mode (for example, program, aperture priority, shutter speed priority, etc.) corresponding to an operation signal from the operation member 106.

  The lens communication unit 109 communicates with the interchangeable lens 50 attached to the camera body 10. Through communication between the camera body 10 and the interchangeable lens 50, lens information such as an aperture value and lens data is transmitted from the interchangeable lens 50 to the camera body 10, while the drive amount, the drive direction, and the like of the focus lens and the vibration-proof lens 53 are Lens control information such as a drive instruction is transmitted from the camera body 10 to the interchangeable lens 50.

  The shutter control unit 110 performs charge and drive control of the shutter 12 (FIG. 1) according to an instruction sent from the system control unit 101. The mirror control unit 111 drives the main mirror 11 to move up (withdraw to the position indicated by the solid line in FIG. 1) and mirror down (position indicated by the broken line in FIG. 1) according to the instruction sent from the system control unit 101. To control the drive.

  The image processing unit 102 is configured by an ASIC or the like. The image processing unit 102 performs image processing such as white balance processing on the digitally converted image data in accordance with an instruction from the system control unit 101, and compresses the image data after image processing in a predetermined format. For example, decompression processing is performed to decompress the image data.

  The display image creation circuit 104 generates display data to be displayed on the liquid crystal monitor 20. The recording medium 105 is configured by a data storage member such as a memory card, for example. The system control unit 101 can store captured image data in the recording medium 105 and can read out data stored in the recording medium 105. The buffer memory 103 is used to temporarily store data before and after each image processing, image compression processing, and display data generation processing.

<Vibration control calculation>
FIG. 3 is a flowchart for explaining the flow of the image stabilization calculation process performed by the system control unit 101. A program for performing the processing of FIG. 3 is stored in a ROM (not shown) in the system control unit 101. In the system control unit 101, the image stabilization control of the single-lens reflex electronic camera system is turned on (the image stabilization switch of the interchangeable lens 50 is turned on, or the camera body 10 is set to the image stabilization on by a menu operation. ) State, when a half-press operation is input from the half-push switch 112, the process of FIG. 3 is repeated.

  In step S11 of FIG. 3, the system control unit 101 calculates the subject distance after initialization, and proceeds to step S12. In the initialization process, for example, the initial value Ws is set as the drive range W of the image stabilization control. The initial value Ws is determined in advance so as to suppress degradation of image quality due to driving of the image stabilizing lens 53 within a predetermined range. For the subject distance, focus detection information after AF processing is acquired from the AF module 107, and the distance is calculated based on the acquired information.

  In step S12, the system control unit 101 acquires lens information via the lens communication unit 109, and proceeds to step S13. The lens information includes focal length information of the interchangeable lens 50. In step S13, the system control unit 101 acquires a signal indicating the control shutter speed TVc from the AE module 108, and proceeds to step S14. The control shutter speed TVc is calculated using the detection output from the photometric sensor 19.

  In step S14, the system control unit 101 acquires a shake detection signal via the lens communication unit 109, and proceeds to step S15. In step S15, the system control unit 101 determines whether shake correction is necessary. If the shake detection signal is greater than or equal to the predetermined value, the system control unit 101 makes a positive determination in step S15 and proceeds to step S16. If the shake detection signal is less than the predetermined value, the system control unit 101 makes a negative determination in step S15 and ends the process of FIG. The negative determination in step S15 is a case where it is not necessary to perform the image stabilization control.

  In step S16, the system control unit 101 calculates the image stabilization control amount Vr according to the shake detection signal, and proceeds to step S17. The image stabilization control amount Vr corresponds to the drive amount of the image stabilization lens 53 necessary for canceling the swing of the subject image on the image sensor 13 due to the vibration of the camera system in the state of the control shutter speed time Tc. The control shutter speed time Tc is a time (exposure time) corresponding to the control shutter speed TVc.

  In step S17, the system control unit 101 determines whether or not the control shutter speed time Tc is shorter than the camera shake limit time (for example, equivalent to 1 / (focal length)). If 1 / (focal length) equivalent> control shutter speed time Tc is satisfied, the system control unit 101 makes a positive determination in step S17 and proceeds to step S18. If 1 / (focal length) equivalent> control shutter speed time Tc is not satisfied, the system control unit 101 makes a negative determination in step S17 and proceeds to step S26.

  If the determination in step S17 is affirmative, the amount of blurring of the captured image is within an allowable range even if the camera system vibrates. In this case, in step S18, the system control unit 101 sets Wn narrower than the initial value Ws in the driving range W of the image stabilization control, and proceeds to step S19.

  The negative determination in step S17 is a case where the blur amount of the captured image may not be within the allowable range due to the vibration of the camera system. In this case, the system control unit 101 determines in step S26 whether the focal length is shorter than a predetermined value (for example, 24 mm = 35 mm system conversion) and the subject distance is shorter than a predetermined distance (for example, 2 m).

  If the focal distance is less than the predetermined value and the subject distance is less than the predetermined distance, the system control unit 101 makes a positive determination in step S26 and proceeds to step S18. If the focal distance is equal to or greater than the predetermined value or the subject distance is equal to or greater than the predetermined distance, the system control unit 101 makes a negative determination in step S26 and proceeds to step S19. When a negative determination is made in step S26, the amount of blurring of the captured image may not be within the allowable range due to the vibration of the camera system.

  In step S <b> 19, the system control unit 101 determines whether or not the image stabilization control amount Vr is larger than the drive range W. If Vr> W is satisfied, the system control unit 101 makes a positive determination in step S19 and proceeds to step S20. If Vr> W is not satisfied, the system control unit 101 makes a negative determination in step S19 and proceeds to step S25. The process proceeds to step S25 when the image stabilization lens 53 is driven with the image stabilization control amount Vr calculated in step S16.

  In step S20, the system control unit 101 calculates a shutter speed time Tx necessary for keeping the image stabilization control amount Vr in the drive range W, and the process proceeds to step S21. In step S21, the system control unit 101 determines whether the shutter speed time Tx is shorter than the control shutter speed time Tc. If the control shutter speed time Tc> the shutter speed time Tx is satisfied, the system control unit 101 makes a positive determination in step S21 and proceeds to step S25. If the control shutter speed time Tc> the shutter speed time Tx does not hold, the system control unit 101 makes a negative determination in step S21 and proceeds to step S22.

  If the determination in step S21 is affirmative, the control shutter speed time Tc may remain unchanged. The negative determination in step S21 is a case where the control shutter speed time Tc needs to be changed to the shutter speed time Tx. In step S22, the system control unit 101 that made a negative determination in step S21 sends a signal indicating the shutter speed time Tc to the AE module 108, causes the exposure calculation to be performed again, and proceeds to step S23. As a result, the AE module 108 uses the shutter speed time Tx and recalculates the appropriate exposure by changing at least one of the ISO sensitivity and the aperture value.

  In step S23, the system control unit 101 acquires the latest shake detection signal via the lens communication unit 109, and proceeds to step S24. In step S24, the system control unit 101 calculates the image stabilization control amount Vr2 according to the shake detection signal, and proceeds to step S25. The image stabilization control amount Vr2 corresponds to the drive amount of the image stabilization lens 53 necessary for canceling the swing of the subject image on the image sensor 13 in the state of the shutter speed time Tx.

  In step S25, the system control unit 101 sends an instruction to the lens communication unit 109, transmits a drive control signal to the lens drive mechanism 54, and ends the process of FIG. The drive control signal is a signal for oscillating the image stabilization lens 53 corresponding to the image stabilization control amount Vr2.

According to the embodiment described above, the following operational effects can be obtained.
(1) The camera system that drives the anti-vibration lens 53 with the anti-vibration control amount Vr corresponding to the shake detection signal prevents the image according to the shutter time Tc (exposure time corresponding to the control shutter speed TVc) determined by the exposure calculation. The driving range of the vibration lens 53 is limited (step S18). For example, if the shutter speed is short and you are not concerned about the effects of camera shake, you can limit the shake suppression amount or stop the shake suppression to perform the image stabilization control appropriately. Can be suppressed.

(2) Since the driving range of the anti-vibration lens 53 is limited when the shutter time Tc is shorter than the camera shake limit time, the shake suppression amount is limited or the shake suppression is stopped only in a situation where the influence of camera shake is unlikely to occur. Can do.

(3) Since the driving range of the image stabilizing lens 53 is limited when the subject distance is shorter than the predetermined distance, the amount of vibration suppression can be limited or the amount of vibration suppression can be stopped only in a situation where the influence of camera shake is unlikely to occur. .

(4) When the image stabilization control amount Vr is larger than the drive range W, the image stabilization control amount Vr is changed from the shutter speed time Tc to Tx so as to be within the drive range W (step S22). As a result, it is possible to suppress deterioration in image quality due to the driving of the image stabilizing lens 53 within a predetermined range.

(Modification 1)
In the above description, the electronic camera has been described as an example, but the present invention can also be applied to a film camera.

(Modification 2)
Although a single-lens reflex camera has been described as an example, the present invention may be applied to a non-single-lens reflex camera. The present invention may also be applied to a type of camera in which the taking lens cannot be replaced.

(Modification 3)
In the above description, the example in which the image stabilization control is performed by vibrating the image stabilization lens 53 according to the shake detection signal has been described. Instead of this, the image stabilization control may be performed by vibrating the image sensor 13 in accordance with the shake detection signal.

(Modification 4)
In the above description, the example in which the image stabilization control is performed optically has been described. However, the present invention may also be applied to the case where blur correction is performed by image processing in an electronic camera. Image processing in this case is, for example, apparent by combining images while correcting a shift (blurring) between images between a plurality of images captured by the image sensor 13 at different times at predetermined intervals. This is a process for suppressing blurring.

  The system control unit 101 according to the fourth modification replaces the above-described image stabilization control amount Vr with the image correction amount Vri and the drive range W with the correction range Wi. Specifically, in step S18, the system control unit 101 sets Wni narrower than the initial value Wsi in the correction range Wi of the image processing, and proceeds to step S19. In step S19, the system control unit 101 determines whether the image correction amount Vri is larger than the correction range Wi. If Vri> Wi is satisfied, the system control unit 101 makes a positive determination in step S19 and proceeds to step S20. If Vri> Wi is not satisfied, the system control unit 101 makes a negative determination in step S19 and proceeds to step S25. The process proceeds to step S25 when image processing is performed with the image correction amount Vri calculated in step S16. In step S20, the system control unit 101 calculates a shutter speed time Tx necessary for keeping the image correction amount Vri in the correction range Wi, and proceeds to step S21.

  According to the fourth modification, even when blur correction is performed by image processing, for example, when the influence of camera shake is not a concern as in shooting using a high shutter speed, the processing amount is limited by limiting the image correction amount. Can be reduced, and deterioration in image quality can be suppressed as compared with the case where the image processing amount is not limited.

(Modification 5)
The example in which the necessity of shake correction is determined based on detection signals from the shake sensors 55a and 55b (step S15) has been described. However, in the case of an electronic camera, the main subject is tracked and tracked instead of using the shake sensor. The necessity of shake correction may be determined according to the movement of the main subject.

  For example, when the main subject moves in parallel in the shooting screen, a shift between images corresponding to the main subject is detected between a plurality of images captured by the image sensor 13 at different times at predetermined intervals. The amount of movement of the subject is acquired based on the direction and size. The system control unit 101 determines whether or not shake correction is necessary by determining whether or not the acquired amount of movement of the subject exceeds a predetermined value.

  Also, when the main subject approaches or moves away from the camera, a plurality of focus detection information detected by the AF module 107 is acquired at different times with a predetermined interval, and the subject's subject is detected based on the acquired information. Get the amount of movement. The system control unit 101 determines whether or not shake correction is necessary by determining whether or not the acquired amount of movement of the subject (in this case, a change in subject distance) exceeds a predetermined value.

  According to the modified example 5, when the amount of movement of the subject is small and the effect of subject blurring is not a concern, the amount of blur suppression is limited or the vibration suppression control is appropriately performed by stopping the blur suppression, thereby limiting Power consumption can be reduced compared to when not.

(Modification 6)
The example in which the AF module 107 uses the light beam that has passed through the interchangeable lens 50 has been described. Instead of this, it is also possible to adopt a configuration using a light beam different from the light beam that has passed through the interchangeable lens 50 (so-called external light method). Also, a passive AF method that acquires focus adjustment information without emitting infrared light or the like, or an active AF method that performs distance measurement by emitting infrared light for focus detection or the like may be used.

  The above description is merely an example, and is not limited to the configuration of the above embodiment. Moreover, you may comprise embodiment and a modified example combining suitably.

It is a figure explaining the principal part structure of the single-lens reflex electronic camera system by one embodiment of this invention. It is a block diagram which illustrates the circuit composition of a camera body. It is a flowchart explaining the flow of the image stabilization calculation process which a system control part performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Camera body 12 ... Shutter 13 ... Image sensor 50 ... Interchangeable lens 51 ... Shooting lens group 53 ... Anti-vibration lens 54 ... Lens drive member 55a, 55b ... Shake sensor 101 ... System control part 107 ... AF module 108 ... AE module

Claims (8)

An imaging member for imaging a subject image through the imaging optical system;
Shake detecting means for detecting swing;
Anti-vibration means for driving the anti-vibration optical system or the imaging member in accordance with the detected oscillation to suppress the oscillation of the subject image;
Brightness detection means for detecting the brightness of the subject;
Exposure calculation means for determining an exposure parameter including at least a shutter time using brightness information detected by the brightness detection means;
A camera system comprising: control means for controlling the image stabilization means so as to limit a drive range of the image stabilization optical system or the imaging member according to a shutter time calculated by the exposure calculation means. The camera system according to claim 1,
The control means narrows the drive range of the image stabilization optical system or the imaging member when the shutter time calculated by the exposure calculation means is shorter than the camera shake limit time than when the camera shake limit time is exceeded. The camera system is characterized by controlling the image stabilizing means. The camera system according to claim 2,
The camera shake limit time corresponds to 1 / (the focal length). The camera system according to claim 3.
The camera system according to claim 1, wherein the control unit controls the image stabilization unit to narrow the driving range when a distance to the subject is less than a predetermined distance. The camera system according to claim 1,
The control means drives the image stabilizing optical system or the imaging member when the amount of movement of the subject corresponding to the shutter time determined by the exposure calculation means is smaller than a predetermined value, compared to when exceeding the predetermined value. A camera system, characterized in that the image stabilization means is controlled to narrow the range. The camera system according to claim 5,
Focus detection means for performing focus detection of the photographing optical system on the subject;
Tracking means for tracking the subject using focus detection information from the focus detection means,
The camera system according to claim 1, wherein the movement amount of the subject is an amount by which the subject tracked by the tracking means moves in a predetermined time. The camera system according to claim 1,
When the drive amount of the image stabilization optical system or the imaging member determined by the image stabilization unit according to the detected swing exceeds the drive range, the control unit stores the drive amount in the drive range. The image stabilization unit instructs the exposure calculation unit to change the shutter time so short as described above, and re-determines the drive amount of the image stabilization optical system or the imaging member according to the changed shutter time. A camera system characterized by controlling the camera. An image sensor that captures a subject image through an imaging optical system;
Shake detecting means for detecting swing;
Correction means for correcting shaking of the subject image by performing image processing on an image signal picked up by the image sensor in accordance with the detected swinging;
Brightness detection means for detecting the brightness of the subject;
Exposure calculation means for determining an exposure parameter including at least a shutter time using brightness information detected by the brightness detection means;
An electronic camera comprising: a control unit that controls the correction unit so as to limit a correction amount according to a shutter time calculated by the exposure calculation unit.

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