JP2020012981A - Interchangeable lens and camera body - Google Patents

Abstract

To provide an interchangeable lens that can prevent a variation in the size of a subject image.SOLUTION: The interchangeable lens is an interchangeable lens that can be attached to a camera body and forms an image of a subject, and comprises: a lens that can be driven in an optical axis direction; an acquisition unit that acquires, from the camera body, first information on the amount of drive of the lens and second information on the amount of change in the size of the image of the subject accompanying the drive of the lens; and a control unit that performs control of driving the lens in the optical axis direction on the basis of the first information and the second information.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an interchangeable lens and a camera body.

  2. Description of the Related Art There is known an imaging apparatus that performs wobbling for minutely moving an imaging optical system in an optical axis direction to determine a focus direction in which a focus position exists (Patent Document 1). However, wobbling may cause a sense of incongruity due to flicker.

JP 2012-58357 A

According to the first aspect of the present invention, the interchangeable lens is an interchangeable lens that can be attached to a camera body and forms an image of a subject, the interchangeable lens being drivable in an optical axis direction, and a first driving amount related to the lens. An acquisition unit that acquires information and second information relating to a change amount of the size of the image of the subject due to driving of the lens from the camera body; and the lens based on the first information and the second information. And a control unit that controls to drive the optical axis in the optical axis direction.
According to a second aspect of the present invention, the camera body is a camera body to which an interchangeable lens having a lens drivable in the optical axis direction can be mounted, wherein an imaging unit for capturing an image of a subject, and a driving amount of the lens And a communication unit for transmitting, to the interchangeable lens, first information related to the change of the size of the image of the subject due to driving of the lens.

FIG. 1 is a diagram illustrating a configuration example of an imaging device according to a first embodiment. FIG. 6 is a diagram for explaining an example of a contrast-type focus detection process performed by the imaging device according to the first embodiment. FIG. 6 is a diagram for explaining an example of a contrast-type focus detection process performed by the imaging device according to the first embodiment. FIG. 7 is a diagram for explaining a process of determining wobbling amplitude by the imaging device according to the first embodiment. FIG. 7 is a diagram for explaining a process of determining wobbling amplitude by the imaging device according to the first embodiment. 5 is a flowchart illustrating an example of a process in the imaging device according to the first embodiment. FIG. 13 is a diagram for explaining an example of a contrast-type focus detection process performed by the imaging device according to the second embodiment. FIG. 13 is a diagram illustrating an example of wobbling by the imaging device according to the second embodiment. FIG. 14 is a diagram for explaining a process of determining wobbling amplitude by the imaging device according to the second embodiment. FIG. 14 is a diagram for explaining a process of determining wobbling amplitude by the imaging device according to the second embodiment. 13 is a flowchart illustrating an example of a process in the imaging device according to the second embodiment.

(First Embodiment)
FIG. 1 is a diagram illustrating a configuration example of a camera 1 that is an example of an imaging device according to the first embodiment. The camera 1 includes a camera body 2 and an interchangeable lens 3. Since the camera 1 includes the camera body 2 and the interchangeable lens 3, the camera 1 may be referred to as a camera system.

  The camera body 2 is provided with a body-side mount 201 to which the interchangeable lens 3 is attached. The interchangeable lens 3 is provided with a lens-side mount portion 301 attached to the camera body 2. The interchangeable lens 3 is detachably held on the body-side mount 201 of the camera body 2 by the lens-side mount 301. The lens-side mount portion 301 and the body-side mount portion 201 are provided with a lens-side connection portion 302 and a body-side connection portion 202, respectively. The lens-side connection portion 302 and the body-side connection portion 202 are provided with a plurality of terminals such as a clock signal terminal, a data signal terminal, and a power supply terminal.

  When the interchangeable lens 3 is mounted on the camera body 2, the terminals provided on the body-side connection portion 202 and the terminals provided on the lens-side connection portion 302 are electrically connected. This enables power supply from the camera body 2 to the interchangeable lens 3 and communication between the camera body 2 and the interchangeable lens 3.

  The interchangeable lens 3 includes a photographing optical system (imaging optical system) 31, an aperture stop 32, a first position detection unit 33, a lens drive unit 34, a second position detection unit 35, and a stop drive unit 36. , A lens memory 37, and a lens control unit 38. The photographing optical system 31 includes a plurality of lenses including a zoom lens (magnification lens) 31 a for changing a focal length and a focus lens (focus adjustment lens) 31 b, and a subject image is formed on an imaging surface of the imaging element 22 of the camera body 2. Form. Although the zoom lens 31a and the focus lens 31b are schematically illustrated in FIG. 1, a normal photographing optical system generally includes a large number of optical elements. Actually, the aperture stop 32 is provided between a plurality of lenses of the photographing optical system 31. The aperture stop 32 may be a part of the photographing optical system 31.

The zoom lens 31a moves along the optical axis L when a zoom ring (not shown) provided on the interchangeable lens 3 is operated. By changing the position of the zoom lens 31a, the focal length of the interchangeable lens 3 changes. The position of the zoom lens 31a may be changed according to the operation of the operation unit 25 of the camera body 2.
The first position detection unit 33 has an encoder, and detects the position of the zoom lens 31a based on a signal output from the encoder. The first position detection unit 33 outputs information (position information) on the position of the zoom lens 31a to the lens control unit 38.

The lens driving unit 34 has a motor such as a stepping motor or an ultrasonic motor, and moves the focus lens 31b along the optical axis L based on a signal output from the lens control unit 38, thereby moving the subject by the photographing optical system 31. The image forming position is changed.
The second position detection unit 35 has an encoder, and detects the position of the focus lens 31b based on a signal output from the encoder. The encoder included in the second position detection unit 35 may be an absolute position encoder or a relative position encoder, or may be a counter that counts driving pulses of a stepping motor. The second position detector 35 outputs information (position information) on the position of the focus lens 31b to the lens controller 38.

  The aperture driving unit 36 has a motor such as a stepping motor or an ultrasonic motor, and drives the aperture stop 32 based on a signal output from the lens control unit 38 to change the aperture diameter. The aperture driving unit 36 outputs information (aperture value information) on the aperture value (F value) of the aperture stop 32 to the lens control unit 38.

  The lens memory 37 is configured by a nonvolatile storage medium or the like. Various information related to the interchangeable lens 3 is stored (recorded) in the lens memory 37. In the lens memory 37, in addition to information such as the focal length and the open aperture value, which are specifications of the interchangeable lens 3, data on the position of the focus lens 31b and the photographing distance, and data on the position and the focal length of the zoom lens 31a. And data related to the drive step of the aperture blades of the aperture stop 32 and the aperture value. Writing of data to the lens memory 37 and reading of data from the lens memory 37 are controlled by a lens control unit 38 described later.

  The lens control unit 38 has a processor such as a CPU, an FPGA, and an ASIC, a ROM, a RAM, and the like, and controls each unit of the interchangeable lens 3 based on a control program. The lens controller 38 controls driving of the focus lens 31b and the aperture stop 32 based on a signal output from the body controller 28 of the camera body 2. When a signal indicating the moving direction and the moving amount of the focus lens 31b is input from the body control unit 28, the lens control unit 38 controls the lens driving unit 34 based on the signal to move the focus lens 31b to the optical axis. By moving in the L direction, the image forming position of the subject image formed by the photographing optical system 31 is adjusted. In addition, the lens control unit 38 controls the aperture diameter of the aperture stop 32 by controlling the aperture drive unit 36 based on a signal output from the body control unit 28 of the camera body 2.

The lens controller 38 controls the position information of the zoom lens 31 a detected by the first position detector 33, the position information of the focus lens 31 b detected by the second position detector 35, and the aperture value information from the diaphragm driver 36. Is stored in a memory inside the lens control unit 38. The lens control unit 38 reads out these pieces of information stored in the internal memory at a predetermined cycle and outputs the information to the body control unit 28.
Alternatively, the lens control unit 38 may control the focal length information of the interchangeable lens 3 obtained from the information of the lens memory 37 and the position of the zoom lens 31a, the photographing distance information obtained from the information of the lens memory 37 and the position of the focus lens 31b, the lens memory The information stored in the lens control unit 38 is stored in the internal memory of the lens control unit 38, and the information stored in the internal memory is read out at a predetermined cycle to obtain the body control information. The data may be output to the unit 28.

  The lens memory 37 stores information (a change coefficient described later) related to the amount of drive of the focus lens 31b and the amount of change in the size of the subject image on the image plane. In the present embodiment, the amount of change in the subject image, which is the difference between the size of the subject image after moving the focus lens and the size of the subject image before moving the focus lens (hereinafter, referred to as the size change ratio of the subject image) Is calculated per unit drive amount of the focus lens 31b (hereinafter, referred to as a change coefficient) is stored in the lens memory 37. As the value of the change coefficient increases, the amount of change in the size of the subject image accompanying driving of the focus lens 31b increases. Note that the change coefficient may be stored in a memory inside the lens control unit 38.

  Next, the configuration of the camera body 2 will be described. The camera body 2 includes an image sensor 22, a body memory 23, a display unit 24, an operation unit 25, and a body control unit 28.

  The image sensor 22 is a CMOS image sensor or a CCD image sensor. The image sensor 22 receives the light beam that has passed through the photographing optical system 31 and captures a subject image. In the image sensor 22, a plurality of pixels each having a photoelectric conversion unit are arranged two-dimensionally (in a row direction and a column direction). The photoelectric conversion unit is configured by a photodiode. The imaging element 22 photoelectrically converts the received light to generate a signal, and outputs the generated signal to the body control unit 28.

  The body memory 23 is configured by a nonvolatile storage medium or the like. The body memory 23 stores image data, control programs, and the like. Writing of data to the body memory 23 and reading of data from the body memory 23 are controlled by the body control unit 28. The display unit 24 displays an image based on image data generated by the body control unit 28 described later, information on photographing such as a shutter speed and an aperture value, and a menu screen. Furthermore, the display unit 24 displays a live view image that sequentially displays image data based on signals continuously captured by the image sensor 22. The operation unit 25 includes a release button, a power switch, various setting switches such as switches for switching various modes, and the like, and outputs an operation signal corresponding to each operation to the body control unit 28.

  The body control unit 28 includes a processor such as a CPU, an FPGA, and an ASIC, a ROM, a RAM, and the like, and controls each unit of the camera 1 based on a control program. The body control unit 28 generates a signal for controlling driving of the zoom lens 31a, the focus lens 31b, and the aperture stop 32, and outputs the generated signal to the lens control unit 38.

  The body control unit 28 supplies a signal for controlling driving of the image sensor 22 to the image sensor 22 to control the operation of the image sensor 22. The body control unit 28 performs various types of image processing on a signal output from the image sensor 22 to generate image data. The image processing includes, for example, known image processing such as gradation conversion processing and color interpolation processing.

  Further, the body control unit 28 performs processing necessary for automatic focusing (AF) of the photographing optical system 31. The body control unit 28 detects a position (hereinafter, referred to as a focus position) of the focus lens 31b at which the subject image by the photographing optical system 31 is focused on the imaging surface of the imaging element 22. The body control unit 28 detects a focus position of the focus lens 31b by a contrast detection method (hereinafter, referred to as focus detection processing). The body control unit 28 sequentially calculates the focus evaluation value (contrast evaluation value) of the subject image based on the signal from the image sensor 22 while moving the focus lens 31b of the photographing optical system 31 in the direction of the optical axis L. The body control unit 28 uses the position information of the focus lens 31b transmitted from the interchangeable lens 3 to associate the position of the focus lens 31b with the focus evaluation value. The body control unit 28 calculates the position of the focus lens 31b at which the focus evaluation value indicates the peak, that is, the local maximum value, as the focus position. The body control unit 28 outputs a signal regarding the calculated focus position to the lens control unit 38. The lens controller 38 adjusts the focus by moving the focus lens 31b to the in-focus position. Hereinafter, the focus detection processing of the contrast method by the camera 1 will be described in more detail.

  FIG. 2 is a diagram illustrating an example of a contrast type focus detection process performed by the camera 1 according to the first embodiment. 2A and 2B, the horizontal axis indicates the position of the focus lens 31b in the optical axis L direction. FIG. 2A shows the relationship between the position of the focus lens 31b and the focus evaluation value. FIG. 2B shows a temporal change in the position of the focus lens 31b. Hereinafter, the focus detection processing of the contrast method by the camera 1 will be described by dividing into four processings (controls) of standby, wobbling, search, and focusing drive as shown in FIG. 2B.

First, standby will be described. The standby is a process (standby process) in which the driving of the focus lens 31b is stopped. For example, once the focusing operation is performed and the subject image is formed on the imaging surface of the imaging element 22 of the camera body 2 by the imaging optical system 31, the driving of the focus lens 31b is stopped. In the standby process, the lens control unit 38 controls the lens driving unit 34 to stop the focus lens 31b.
In the standby process, the drive of the focus lens 31b is stopped, but the body control unit 28 repeatedly calculates the focus evaluation value and performs a process of determining whether to drive (restart) the focus lens 31b. The body control unit 28 repeatedly calculates a focus evaluation value using a signal output from the image sensor 22 in a state where the focus lens 31b is stopped, and changes the focus evaluation value beyond a predetermined threshold (when the subject is When the focus lens 31b is moved (moved in the optical axis direction), it is determined that the focus lens 31b is driven (moved). Note that the body control unit 28 may determine that the focus lens 31b should be driven when a predetermined time has elapsed since the focus lens 31b was stopped.

The wobbling is a process of moving the focus lens 31b back and forth in the optical axis L direction (back and forth driving), and is also referred to as a wobbling process. The camera 1 performs wobbling processing for moving the focus lens 31b back and forth along the optical axis L, and calculates a focus evaluation value. In the present embodiment, the camera 1 performs wobbling (three-point wobbling) for moving the focus lens 31b to three different positions (closest position, center position, and infinity position), and focus evaluation at each position. Calculate the value. The body control unit 28 compares the focus evaluation values calculated at the three positions, respectively, so that the direction (focus evaluation value) from the current position of the focus lens 31b to the position (focus position) where the focus evaluation value reaches a peak (focus position). Is determined), or when there is a focus position within the range of wobbling, the focus position is specified.
Here, the “closest side” refers to a direction in which the focus lens 31b is moved when an image of a subject closer to the subject whose image is currently formed on the imaging surface of the imaging device 22 is formed on the imaging surface of the imaging device 22. The infinity side means that the focus lens 31b is moved when an image of a subject that is farther than the subject whose image is currently formed on the imaging surface of the imaging device 22 is formed on the imaging surface of the imaging device 22. Direction.

At three different positions (closest position, center position, and infinity position) of the focus lens 31b, the focus evaluation values calculated from the signals output from the image sensor 22 are Vnr, Vct, and Vfr, respectively. When the relationship of the following expression (1) is satisfied, the body control unit 28 moves the focus lens 31b in the infinity direction, which is a direction in which the focus evaluation value increases, in a search process described later (search direction). To be determined. When the focus evaluation values Vnr, Vct, and Vfr satisfy the relationship of the following equation (2), the body control unit 28 determines the closest direction in which the focus evaluation value increases as the search direction.
Vfr>Vct> Vnr (1)
Vfr <Vct <Vnr (2)
When the focus evaluation values Vnr, Vct, and Vfr satisfy the following expression (3), the body control unit 28 determines that the focus position is within the range in which the focus lens 31b is driven in the wobbling process. Then, it is determined that the focusing drive is performed.
Vfr <Vct and Vct> Vnr (3)
If the focus evaluation values Vnr, Vct, and Vfr do not satisfy any of the above-described equations (1) to (3), the body control unit 28 performs a search process in a predetermined direction or a standby process. Decide what to do.

The search is a process (search process) of driving the focus lens 31b in a search direction in which the focus evaluation value determined by the wobbling process increases. The body control unit 28 transmits a search drive instruction signal to the lens control unit 38, thereby sequentially moving the focus lens 31b, calculates a focus evaluation value at each position, and detects a focus position. In this case, the body control unit 28 associates the position of the focus lens 31b with the focus evaluation value using the position information of the focus lens 31b transmitted from the lens control unit 38, and the body control unit 28 The focus evaluation value at each position of the lens 31b is grasped. If the focus lens 31b continues to be driven in the search direction in which the focus evaluation value is increased, and the focus evaluation value continuously becomes smaller than the previously calculated focus evaluation value a plurality of times, it is determined that the focus position has exceeded the focus position. After the judgment, the search process is terminated, and the focus position is calculated using the focus evaluation values.
The focus drive is a process of driving the focus lens 31b to the detected focus position (focus drive process).

  The example illustrated in FIG. 2 illustrates a case where the subject moves while waiting from time t3 to time t4, and the focus evaluation value changes. In FIG. 2A, a waveform solid line 41a represents a change in the focus evaluation value before the movement of the subject, and a waveform dotted line 41b represents a change in the focus evaluation value after the movement of the subject.

  First, the focusing operation on the subject before the movement will be described. At time t0 shown in FIG. 2, the body control unit 28 controls the lens control unit 38 to start a search process for moving the focus lens 31b from the position P0 toward the close side. In the period from time t0 to time t1, the body control unit 28 sequentially calculates the focus evaluation value using the signal output from the image sensor 22 while moving the focus lens 31b in the close direction. When the focus lens 31b is moved in the close direction, the focus evaluation value gradually increases, and after reaching the maximum (maximum) at the focus lens position P1, the focus evaluation value decreases. The body control unit 28 detects the position P1 that is the position of the focus lens 31b at which the calculated focus evaluation value becomes the maximum (maximum) as the focus position.

  Next, during a period from time t1 to time t3 shown in FIG. 2, the body control unit 28 controls the lens control unit 38 to move the focus lens 31b to the focus position P1 detected by the search process. Drive.

  Note that the body control unit 28 may perform focus driving as shown in FIG. FIG. 3 is a diagram for explaining another example of the focus detection processing of the contrast method by the camera 1 according to the first embodiment. In the example shown in FIG. 3, during the period from time t1 to time t2, the body control unit 28 controls the lens control unit 38 to move the focus lens 31b to the focus position P1 detected by the search processing. Drive. During the period from the time t1 to the time t2 during which the focusing drive is performed, the body control unit 28 moves the focus lens 31b to the infinity side which is the direction of the focusing position, and calculates the focus evaluation value again. In this case, the frequency of calculation of the focus evaluation value with respect to the movement of the focus lens 31b is set higher than that at the time of the search processing (the interval between the positions of the focus lens 31 for calculating the focus evaluation value is narrowed), so that the focus position P1 is set. It can be obtained more accurately. The focus evaluation value gradually increases until the focus lens 31b passes through the position P1, and decreases after passing through the position P1. When the focus evaluation value decreases, the body control unit 28 controls the lens control unit 38 to stop driving the focus lens 31b (time t2), and moves the focus lens 31b to the accurately determined focusing position P1. (Time t3). By driving in this manner, the focus lens 31b moves to the in-focus position P1 from a fixed direction (in the present embodiment, at infinity), thereby eliminating the backlash of the lens barrel of the interchangeable lens 3 and achieving more accurate focusing. It can move to the focus position.

  Returning to FIG. 2, at time t3, the body control unit 28 controls the lens control unit 38 to start a standby process for stopping the driving of the focus lens 31b. While the focus lens 31b is stopped by the standby process, the body control unit 28 repeatedly calculates the focus evaluation value at a predetermined cycle, and determines whether the focus evaluation value has changed beyond a predetermined threshold.

  When the subject moves during the period from time t3 to time t4 and the body control unit 28 detects that the focus evaluation value has changed beyond a predetermined threshold, it determines to perform the wobbling process.

  During a period from time t4 to time t5, the body control unit 28 controls the lens control unit 38 to sequentially move the focus lens 31b from the position P1 to three positions (closest position, center position, and infinity position). A three-point wobbling process for moving is performed. The body control unit 28 performs fine driving (the driving width is indicated by W) of the focus lens 31b as shown in a period from time t4 to time t5 in FIG. 2B, and focus evaluation at each of the three positions. Calculate the value. As described above, the body control unit 28 determines the search direction by determining the magnitude relationship between the three calculated focus evaluation values. Note that the driving order of the focus lens 31b in the wobbling process is not limited to the illustrated example. The body control unit 28 may drive the focus lens 31b in the order of the infinity position, the center position, and the closest position.

At time t5, the body control unit 28 moves the focus lens 31b in the search direction determined by performing the three-point wobbling process (the direction in which the focus evaluation value increases in the three-point wobbling process, the closest direction in FIG. 2B). The search process to be driven is started. The search processing started at time t5 is the same as the search processing from time t0 to time t1, and during the period from time t5 to time t6, the body control unit 28 moves the focus lens 31b in the close side direction and sets the focus evaluation value. Is repeatedly calculated. The body control unit 28 detects the position P2, which is the focus position, using the calculated focus evaluation value.
During the period from time t6 to time t7, the body control unit 28 performs the focusing drive to move the focus lens 31b to the focusing position P2 detected by the search process, as in the period from time t1 to time t3.
As shown in the period from the time t6 to the time t7 in FIG. 3, the focus driving may be performed again by calculating the focus evaluation value again to obtain the focus position P2 more accurately.

  As described above, in the contrast-type automatic focus adjustment (contrast AF) according to the present embodiment, the four processes of standby, wobbling, search, and focusing drive are performed, and thus the focus position of the imaging optical system 31 is determined. Adjustments are made.

  The wobbling process described above will be described in more detail. The change rate of the size of the subject image changes according to the magnitude of the drive amount (referred to as wobbling amplitude) in the wobbling process of the focus lens 31b. When the wobbling amplitude (the amplitude W shown in FIG. 2B) is relatively large, the rate of change in the size of the subject image that occurs when the wobbling process is performed becomes large. The quality of the resulting image is reduced. Further, there is also a decrease in image quality due to a change in the direction of a change in the size of the subject image that occurs when the wobbling process is performed. For example, when the focus lens 31b moves from the center position to the closest side, the subject image becomes large, and when the focus lens 31b moves from the center position to the infinity side, the subject image becomes small. is there. In this case, as the amplitude W increases, the variation in the size of the subject image also increases, and it becomes conspicuous that the subject image becomes larger or smaller.

  In the present embodiment, the body control unit 28 determines the target drive amount which is a value indicating the drive amount (amplitude W) of the wobbling process of the focus lens 31b, and the limit value of the size change ratio of the subject image during the wobbling process. Information (limit value information) on the (allowable value) is transmitted to the lens control unit 38, respectively. The target drive amount of the focus lens 31b is generated by the body control unit 28. The lens control unit 38 receives the target drive amount and the limit value information from the body control unit 28.

  The lens control unit 38 determines the wobbling amplitude W in the actual wobbling process based on the target drive amount and the limit value information acquired from the body control unit 28 and the change coefficient stored in the lens memory 37 described above. I do. The lens control unit 38 adjusts the wobbling amplitude W of the actually performed wobbling process so that the size change rate of the subject image when the wobbling process is performed is equal to or less than the limit value indicated by the limit value information. That is, when the focus lens 31b is driven by the target drive amount received from the body control unit 28, if the change rate of the size of the subject image exceeds the limit value (allowable value) of the limit value information, the focus lens 31b does not exceed the target drive amount. The focus lens 31b is driven by the drive amount to perform a wobbling process. As a result, it is possible to suppress a change in the size of the subject image caused by the wobbling process, to prevent a decrease in image quality, and to prevent a decrease in user's feeling of use (uncomfortable feeling). Hereinafter, a method of determining the wobbling amplitude in the camera 1 will be described.

  The body control unit 28 determines a target drive amount of the focus lens 31b based on the aperture value information output from the lens control unit 38. When the aperture stop 32 is stopped down, that is, when the aperture diameter of the aperture stop 32 decreases (the F value increases), the depth of focus increases, so that the focus evaluation value changes with respect to the position change of the focus lens 31b (the gradient of the focus evaluation value). Becomes smaller. When the change in the focus evaluation value is small, it becomes difficult for the body control unit 28 to compare the plurality of focus evaluation values acquired by the wobbling process and to detect a correct search direction and a correct focus position. For this reason, in order to accurately determine the search direction in the wobbling process, it is desirable that the smaller the aperture stop 32 is, the larger the wobbling amplitude is.

  Therefore, the body control unit 28 determines that the smaller the aperture stop 32 is, the larger the target drive amount is. In the present embodiment, the correspondence between the aperture value and the target drive amount is obtained in advance by simulation, experiment, or the like, and is stored in a memory inside the body control unit 28 as a data table or a calculation formula. The body control unit 28 determines the target drive amount of the focus lens 31b by referring to the above-described correspondence relationship for the aperture value indicated by the aperture value information. Note that a data table or a calculation formula may be stored for each lens.

Further, the body control unit 28 determines a limit value which is an upper limit value of a change rate of the size of the subject image caused by the wobbling process so that the size of the subject image does not change so as not to give the user a sense of discomfort. . Note that the limit value of the change ratio of the size of the subject image may be a fixed value or a variable value. For example, the limit value may be set smaller on the near side and larger on the infinity side.
The body control unit 28 transmits the determined target drive amount and the limit value information indicating the limit value of the change rate of the size of the subject image to the lens control unit 38, respectively.

The lens control unit 38 uses the target drive amount received from the body control unit 28 and the change coefficient stored in the lens memory 37 to move the focus lens 31b by the target drive amount, and generates the size of the subject image. Calculate the change rate. The lens control unit 38 compares the calculated change rate of the size of the subject image with the limit value of the change rate of the size of the subject image indicated by the limit value information, and determines the wobbling amplitude at which the actual wobbling is performed based on the comparison result. decide.
The drive amount of the focus lens 31b corresponding to the limit value is calculated using the limit value and the change coefficient of the size change ratio of the subject image, and the wobbling amplitude W for actually performing wobbling is determined by comparing the drive amount with the target drive amount. You may.

FIG. 4 shows that the size change ratio BL of the subject image generated when the focus lens 31b is moved with the amplitude Wc as the target drive amount is equal to or less than the limit value B of the subject image size change ratio indicated by the limit value information. FIG. When the size change ratio BL of the subject image is equal to or less than the limit value B, the change in the size of the subject image is not conspicuous even if the focus lens 31b is moved by the target drive amount Wc (there is no uncomfortable feeling). Determines the target drive amount Wc as the wobbling amplitude W, as shown in the following equation (4).
W = Wc (4)
The lens control unit 38 controls the lens driving unit 34 according to the determined wobbling amplitude W, and performs three-point wobbling.

FIG. 5 shows that the subject image size change ratio BL generated when the focus lens 31b is moved according to the target drive amount Wc is larger than the limit value B of the subject image size change ratio indicated by the limit value information. It is a figure showing about a case. When the size change ratio BL of the subject image is larger than the limit value B, if the focus lens 31b is moved according to the target driving amount Wc, the change in the size of the subject image is conspicuous, and the image quality may be degraded. Therefore, the lens control unit 38 limits the wobbling amplitude W to a value smaller than the target drive amount Wc. In the present embodiment, the lens controller 38 calculates the wobbling amplitude W using the following equation (5) such that the size change ratio of the subject image becomes the limit value B.
W = (B / BL) × Wc (5)
The lens control unit 38 controls the lens driving unit 34 according to the determined wobbling amplitude W, and performs three-point wobbling. Note that the method of limiting the wobbling amplitude W is not limited to the method described above. The wobbling amplitude W may be calculated by multiplying the target drive amount Wc by a coefficient so that the size change ratio of the subject image becomes smaller than the limit value B. When the size change rate BL of the subject image is larger than the limit value B, the lens control unit 38 limits the target drive amount Wc based on the limit value B, and sets the wobbling amplitude W using the limited target drive amount. It may be determined. In this case, the lens controller 38 may determine the wobbling amplitude W by multiplying the target drive amount Wc by a coefficient or by subtracting a predetermined amount from the target drive amount Wc.

  Further, the body control unit 28 can take a value of “no limit” (for example, “0”) as the limit value B of the size change ratio of the subject image. Upon receiving the limit value information indicating no limitation and the target drive amount from the body control unit 28, the lens control unit 38 performs three-point wobbling with the drive amount specified by the target drive amount. When B ≧ BL or B = 0 (no limit), the body control unit 28 sets the wobbling amplitude W to the target drive amount Wc according to the above equation (4), and if BL> B and B ≠ 0, Determines the wobbling amplitude W according to the above equation (5).

  Even if the wobbling amplitudes are the same, the size change ratio of the subject image varies depending on the focal length of the interchangeable lens, that is, the position of the zoom lens 31a. Therefore, in the present embodiment, the movable range of the zoom lens 31a is divided into a plurality of sections (ranges), and the change coefficient is stored in the lens memory 37 for each section. A change coefficient for each of a plurality of sections (ranges) obtained by dividing the movement range of the zoom lens 31a is obtained in advance by simulation, experiment, or the like, and stored in the lens memory 37 as a data table. The equation for calculating the change coefficient may be stored in the lens memory 37.

  The lens control unit 38 selects a change coefficient corresponding to the position of the zoom lens 31a during the wobbling process based on the position information of the zoom lens 31a output from the first position detection unit 33. The lens control unit 38 determines the wobbling amplitude by the above-described method based on the selected change coefficient and the target drive amount and the limit value information transmitted from the body control unit 28.

  FIG. 6 is a flowchart illustrating an example of processing in the camera 1 according to the first embodiment. An operation example of the camera 1 will be described with reference to the flowchart in FIG. The processing shown in FIG. 6 includes shooting for displaying a through image (live view image) that continuously displays an image of a subject immediately after shooting on the display unit 23 and shooting of a still image or a moving image for recording. Is executed repeatedly when

  In step S100, the body control unit 28 of the camera body 2 calculates a focus evaluation value using a signal output from the image sensor 22 in the standby process, and determines whether the focus evaluation value has changed beyond a predetermined threshold. Is determined. If the body control unit 28 determines that the focus evaluation value has changed beyond a predetermined threshold, the process proceeds to step S110.

In step S110, the body control unit 28 determines the target drive amount of the focus lens 31b based on the aperture value information of the aperture stop 32 transmitted from the interchangeable lens 3.
In step S120, the body control unit 28 transmits a signal (instruction signal) for instructing (requesting) the wobbling process, the determined target drive amount Wc, and the limit value information indicating the limit value of the subject image size change rate. Transmit to the interchangeable lens 3.

In step S200, the lens control unit 38 of the interchangeable lens 3 receives the wobbling processing instruction signal, the target drive amount Wc of the focus lens 31b, and the limit value information of the focus lens 31b from the camera body 2.
In step S210, the lens control unit 38 of the interchangeable lens 3 uses the change coefficient stored in the lens memory 37 and the target drive amount Wc of the focus lens 31b to move the focus lens 31b by the target drive amount Wc. The size change rate BL of the resulting subject image is calculated. As described above, the lens control unit 38 determines the wobbling amplitude W based on the comparison result of the subject image size change ratio BL and the limit value B of the subject image size change ratio indicated by the limit value information. .
In step S220, the lens control unit 38 controls the lens driving unit 34 based on the determined wobbling amplitude W to execute three-point wobbling.

  In step S130, the body control unit 28 calculates a focus evaluation value at each of three positions (closest position, center position, and infinity position) where the focus lens 31b is moved by three-point wobbling. The body control unit 28 compares the calculated focus evaluation values at the three positions, generates a signal related to driving of the focus lens based on the comparison result, and transmits the signal to the interchangeable lens 3.

  If the in-focus position is detected in step S130, the body control unit 28 transmits to the interchangeable lens 3 a signal instructing the in-focus drive and a signal indicating the in-focus position in step S140. In this case, in step S230, the lens control unit 38 receives a signal for instructing focusing driving and a signal indicating the focusing position. Then, in step S240, the lens control unit 38 performs focus driving based on the received signal.

If the search direction is detected in step S130, the body control unit 28 transmits a signal indicating a search process and a signal indicating the search direction to the interchangeable lens 3 in step S140. In this case, in step S230, the lens control unit 38 receives a signal indicating a search process and a signal indicating a search direction. Then, in step S240, the lens control unit 38 performs a search process based on the received signal. When the in-focus position is detected in this search processing, a focus drive instruction signal and a signal of the in-focus position are transmitted from the body control unit 28 to the lens control unit 38, and the lens control unit 38 I do.
While the contrast AF is being performed, the processing of the camera body 2 from step S100 to step S140 and the processing of the interchangeable lens 3 from step S200 to step 240 are repeated.

According to the above-described embodiment, the following operation and effect can be obtained.
(1) In this embodiment, the drive amount of the focus lens when wobbling is performed can be adjusted according to the target drive amount and the limit value information. For this reason, it is possible to suppress a change in the size of the subject image when driving the focus lens, and it is possible to suppress an uncomfortable feeling of the observer, such as flickering of an image obtained by capturing the subject image. Become.

(2) In the present embodiment, since the change coefficient is stored in the interchangeable lens 3, the change coefficient is transmitted from the interchangeable lens 3 to the camera body 2, and the camera body 2 determines the driving amount of the focus lens 31b to change the interchangeable lens. 3, the amount of data transmitted from the interchangeable lens 3 to the camera body 2 can be reduced, and the communication time and the number of times of communication can be reduced. Further, the amount of calculation of the body control unit 28 can be reduced. Since the wobbling drive amount is determined in the interchangeable lens 3, even if the state of the lens (the position of the zoom lens, etc.) changes, the focus lens 31 b suitable under the condition without communicating with the camera body 2. , And the lens drive control can be performed. As a result, the focusing operation can be performed smoothly.

(3) In the present embodiment, the body control unit 28 determines the drive amount of the focus lens 31b and the limit value of the rate of change in the size of the subject image, and sends the determined target drive amount and limit value information indicating the limit value. Output to interchangeable lens. Therefore, the interchangeable lens 3 can adjust the drive amount of the focus lens 31b when performing wobbling according to the target drive amount and the limit value information.

(Second embodiment)
An imaging device according to a second embodiment will be described with reference to the drawings. In the first embodiment, the focus lens 31b is stopped in the standby processing. On the other hand, in the second embodiment, wobbling (two-point wobbling) for continuously moving the focus lens 31b to two different positions is performed during the standby processing period. In the drawings, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and differences are mainly described.

  FIG. 7 is a diagram for explaining an example of the focus detection processing of the contrast method by the camera 1 according to the second embodiment. In the standby process, two-point wobbling for moving the focus lens 31b to two different positions (closest position and infinity position) is repeatedly performed, and a focus evaluation value at each position is calculated. Also, as shown in FIG. 7, the camera 1 can obtain a plurality of focus evaluation values for each position by repeatedly performing the driving to the closest position and the infinity position a plurality of times in the standby process. it can.

Further, the body control unit 28 performs a process of determining whether or not to perform a search process while performing two-point wobbling in the standby process. The body control unit 28 determines to perform the search process when the focus evaluation value calculated for the closest position or the focus evaluation value calculated for the infinity position changes beyond a predetermined threshold. In the present embodiment, the body control unit 28 performs a search process when the average value of the plurality of focus evaluation values calculated for the closest position (or the position at infinity) exceeds a predetermined threshold. Is determined.
Further, when the difference between the focus evaluation value calculated for the closest position and the focus evaluation value calculated for the infinity position exceeds a predetermined threshold value, it may be determined that the search process is to be performed.

  If the number of acquired focus evaluation values reaches a predetermined number without determining that the search process is to be performed, the body control unit 28 changes the wobbling position at time t21 as shown in FIG. The body control unit 28 determines the magnitude relationship between the focus evaluation values obtained at each of the closest position and the infinity position, and shifts the center position of the focus lens 31b toward the position where the larger focus evaluation value is obtained. To perform two-point wobbling. Note that the shift amount may be about the wobbling amplitude. By doing so, it is possible to cause the subject to follow the focus with relatively little movement.

When the body control unit 28 determines that the search process is to be performed, the body control unit 28 determines the search direction by comparing the focus evaluation values calculated for each of the closest position and the infinity position. The focus evaluation values at the closest position and the infinity position are Vnr and Vfr, respectively, and when these satisfy the relationship of the following Expression (6), the body control unit 28 determines the infinity direction as the search direction. . When the focus evaluation values Vnr and Vfr satisfy the relationship of the following equation (7), the body control unit 28 determines the closest direction as the search direction.
Vfr> Vnr (6)
Vfr <Vnr (7)
In the present embodiment, the focus evaluation value Vnr in the above equations (6) and (7) is an average value of a predetermined number of focus evaluation values calculated at the closest position, and the focus evaluation value Vfr is It is an average value of a predetermined number of focus evaluation values calculated at the infinity side position. Each of the focus evaluation values Vnr and Vfr may be a single focus evaluation value instead of an average value.

When the focus evaluation values Vnr and Vfr satisfy the condition of the following equation (8), search processing in a predetermined direction or standby processing in which the position of wobbling is changed as shown in FIG. 8 is performed. Decide that.
Vfr = Vnr (8)
Hereinafter, the process of determining the wobbling amplitude will be described with reference to FIGS. 9 and 10.

  FIGS. 9 and 10 are diagrams for explaining a process of determining the wobbling amplitude of two-point wobbling by the camera 1 according to the second embodiment. FIG. 9 is a diagram illustrating a case where the size change ratio BL of the subject image generated when the focus lens 31b is moved according to the target drive amount Wc from the camera body 2 is the limit value of the subject image size change ratio indicated by the limit value information. B is shown below. In this case, the lens controller 38 determines the target drive amount Wc as the wobbling amplitude W and performs two-point wobbling as shown in the above equation (4).

FIG. 10 shows that the subject image size change rate BL generated when the focus lens 31b is moved according to the target drive amount Wc is larger than the limit value B of the subject image size change rate indicated by the limit value information. Shows the case. In this case, the lens control unit 38 performs the two-point wobbling by adjusting the wobbling amplitude W to a value smaller than the target drive amount Wc using the above-described equation (5).
As in the case of the first embodiment, when BL ≦ B or B = 0 (no limit), the body control unit 28 determines the wobbling amplitude W by the above equation (4), and BL> In the case of B and B ≠ 0, the wobbling amplitude W is determined by the above equation (5).
As described above, in the present embodiment, the camera 1 executes the two-point wobbling and calculates the focus evaluation value even in the standby state after the camera is once focused. Therefore, even if the subject moves, the focusing operation can be performed immediately.

FIG. 11 is a flowchart illustrating an example of processing in the camera 1 according to the second embodiment. An operation example of the camera 1 will be described with reference to a flowchart of FIG.
In step S300, the body control unit 28 of the camera body 2 determines the target drive amount Wc of the focus lens 31b based on the aperture value information of the aperture stop 32.
In step S310, the body control unit 28 transmits the wobbling instruction signal, the determined target drive amount Wc, and limit value information indicating the limit value of the subject image size change ratio to the interchangeable lens 3. Note that if it is determined to be NO in step S320 to be described later and the process returns to step S310, an instruction to change the center position of wobbling may be transmitted to the interchangeable lens.

In step S400, the lens control unit 38 of the interchangeable lens 3 receives the wobbling instruction signal, the target drive amount Wc, and the limit value information from the camera body 2.
In step S410, the lens control unit 38 determines the wobbling amplitude W based on the target drive amount Wc, the limit value information, and the change coefficient stored in the lens memory 37, as in the first embodiment. I do.
In step S420, the lens control unit 38 controls the lens driving unit 34 based on the determined wobbling amplitude W to execute two-point wobbling.

  In step S320, the body control unit 28 calculates a focus evaluation value for each of the closest position and the infinity position where the focus lens 31b is moved by two-point wobbling. The body control unit 28 determines whether to perform the search processing as described above, using the calculated focus evaluation values at the two positions. If the body control unit 28 determines that the search process is to be performed, the process proceeds to step S330.

  In step S330, the body control unit 28 determines the search direction by comparing the focus evaluation values calculated for the closest position and the infinity position, respectively. The body control unit 28 transmits an instruction signal for instructing a search process and a signal indicating a search direction to the interchangeable lens 3.

  In step S430, when the lens control unit 38 receives the search processing instruction signal and the signal indicating the search direction from the camera body 2, the process proceeds to step S440, and if a negative determination is made in step S430, the process returns to step S400.

  If it is not determined that the search processing is to be performed in step S320 and the acquired focus evaluation value has reached the predetermined number, the process returns to step S310, and the body control unit 28 performs the processing as in the example shown in FIG. A process of changing the range in which the focus lens 31b is moved by two-point wobbling is performed. The body control unit 28 transmits a wobbling instruction signal, a signal indicating a shift amount of the center position of the focus lens 31b, a target drive amount, and limit value information to the lens control unit 38. In this case, in steps S400 to S420, the lens control unit 38 determines the wobbling amplitude W based on the received target drive amount and the limit value information, and based on the determined wobbling amplitude W and the signal indicating the received shift amount. Execute two-point wobbling. Thereby, the moving range of the focus lens 31b by the two-point wobbling is changed. Then, in step S320, the body control unit 28 calculates a focus evaluation value for the changed closest position and the infinity position, and determines whether to perform the search process.

  In step S440, the lens control unit 38 controls the lens driving unit 34 based on the search processing instruction signal and the signal indicating the search direction to execute the search processing.

In step S340, the body control unit 28 calculates a focus evaluation value at each position where the focus lens 31b is sequentially moved by the search processing. The body control unit 28 detects the in-focus position using the calculated focus evaluation value at each position. When detecting the in-focus position, the body control unit 28 proceeds to step S350.
In step S350, the body control unit 28 transmits to the interchangeable lens 3 an instruction signal for instructing focusing driving and a signal regarding the detected in-focus position.

In step S450, upon receiving the focus drive instruction signal and the signal regarding the focus position from the camera body 2, the lens control unit 38 proceeds to step S460.
In step S460, the lens control unit 38 controls the lens driving unit 34 based on the focus drive instruction signal and the signal regarding the focus position to execute the focus drive. Thereby, the focus lens 31b is moved to the in-focus position detected by the search processing.
While the contrast AF is being performed, the processing of the camera body 2 from step S300 to step S350 and the processing of the interchangeable lens 3 from step S400 to step 460 are repeated.

According to the above-described embodiment, the following operation and effect can be obtained in addition to the operation and effect similar to those of the first embodiment.
(4) In the present embodiment, the interchangeable lens 3 executes the two-point wobbling even in the standby state after being once focused, and calculates the focus evaluation value. Therefore, even if the subject moves, the focusing operation can be performed immediately.
(5) In the present embodiment, the drive amount of the focus lens 31b when performing two-point wobbling can be adjusted according to the target drive amount Wc and the limit value information. As a result, it is possible to suppress a change in the size of the subject image when the lens is driven, and to suppress a user's discomfort with the display of the image generated in the camera body 2.

  The following modifications are also within the scope of the present invention, and one or more of the modifications can be combined with the above-described embodiment.

(Modification 1)
In the above-described embodiment, the limit value of the size change ratio of the subject image is transmitted from the camera body 2 to the interchangeable lens 3 as the limit value information. However, the limit value information is not limited to this. The amount of change in the size of the subject image may be set as the limit value for each image height, the amount of change in the imaging magnification of the interchangeable lens 3 may be set as the limit value, and the change in the size of the subject image is limited. Any value is acceptable. In this case, information (change coefficient) related to the drive amount of the focus lens 31b and the change amount of the size of the subject image corresponding to the limit value information is stored in the lens memory 37 of the interchangeable lens 3.

(Modification 2)
Even if the magnitude of the wobbling amplitude is the same, the rate of change of the size of the subject image varies depending on the shooting distance, that is, the position of the focus lens 31b. Therefore, in the present modification, the change coefficient according to the position of the focus lens 31b is set in advance. It is obtained by simulation or experiment and stored in the lens memory 37. Specifically, the range in which the focus lens 31b can move is divided into a plurality of sections (ranges), and the change coefficient for each section is stored in the lens memory 37 as a data table or a calculation formula.
The lens control unit 38 selects a change coefficient corresponding to the position of the focus lens 31b at the time of the wobbling process, based on the position information of the focus lens 31b output from the second position detection unit 35. The lens control unit 38 determines the wobbling amplitude by the above-described method based on the selected change coefficient and the target drive amount and the limit value information transmitted from the body control unit 28.

  As described above, the change ratio of the size of the subject image changes according to the position of the zoom lens 31a, and also changes according to the position of the focus lens 31b. Therefore, the change coefficient for each position of the zoom lens 31a and each position of the focus lens 31b may be stored in the lens memory 37.

(Modification 3)
The body control unit 28 of the camera body 2 may switch the limit value B of the size change ratio of the subject image according to the shooting mode (operation mode) of the camera body 2 (or the camera 1). For example, the limit value in the case of the moving image shooting mode may be set lower (stricter) than the limit value in the case of acquiring a live view image. Different limit values may be set for the moving image shooting mode and the still image shooting mode. For example, the limit value in the moving image shooting mode may be set lower than the limit value in the still image shooting mode.

  Further, the limit value in the mode of shooting a scene (scene) in which the change in the size of the subject image is inconspicuous may be set relatively high (slowly). For example, when the camera 1 is performing panning, the body control unit 28 may set the limit value to be relatively high. Further, the body control unit 28 detects a shake of the camera 1 using a signal from the angular velocity sensor or the acceleration sensor. If the shake amount of the camera 1 is large and the change in the size of the subject image is not conspicuous, The value may be set relatively high.

(Modification 4)
The imaging device described in the above-described embodiment and the modified examples may be applied to a camera, a smartphone, a tablet, a camera built in a PC, an in-vehicle camera, a camera mounted on an unmanned aerial vehicle (drone, radio-controlled machine, etc.), and the like. Good.
In the above-described embodiment, the information on the moving amount of the focus lens is transmitted from the camera body 2 to the interchangeable lens 3 by the driving amount, but the present invention is not limited to this. When the focus lens is driven by a stepping motor or the like, the information on the movement amount of the focus lens may be indicated by the number of steps of the stepping motor, or the number of steps of position information output by the encoder, and the like. What is necessary is just to show by the information equivalent to a movement amount.
Further, the change coefficient held by the interchangeable lens is held as a value related to the size of the subject image, but is not limited to this, and may be held as a value related to the angle of view.

  Although various embodiments and modified examples have been described above, the present invention is not limited to these contents. Other embodiments that can be considered within the scope of the technical concept of the present invention are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Image pick-up device, 2 ... Camera body, 3 ... Interchangeable lens, 22 ... Image sensor, 28 ... Body control part, 31a ... Zoom lens, 31b ... Focus lens, 32 ... Aperture stop, 37 ... Lens memory, 38 ... Lens control Department

Claims (14)

An interchangeable lens that can be attached to the camera body and forms an image of the subject,
A lens that can be driven in the optical axis direction,
An acquisition unit configured to acquire, from the camera body, first information about a driving amount of the lens and second information about a change amount of a size of an image of the subject due to driving of the lens;
A control unit that performs control to drive the lens in the optical axis direction based on the first information and the second information;
Interchangeable lens provided with. The interchangeable lens according to claim 1,
The interchangeable lens, wherein the control unit determines a driving amount of the lens based on the first information and the second information, and drives the lens in an optical axis direction based on the determined driving amount. In the interchangeable lens according to claim 1 or 2,
The interchangeable lens is a focus lens that changes a position where an image of the subject is formed. In the interchangeable lens according to any one of claims 1 to 3,
The first information is information on a target drive amount for driving the lens to a target position to change a position where an image of the subject is formed,
The second information is information relating to a limit value of a change amount of a size of an image of the subject due to driving of the lens,
The interchangeable lens, wherein the control unit determines a drive amount of the lens based on a target drive amount of the first information and a limit value of the second information. The interchangeable lens according to claim 4,
When the amount of change in the size of the image of the subject when the lens is driven to the target drive amount exceeds the limit value of the second information, the control unit sets the target drive amount to the second information. An interchangeable lens that determines the amount of driving of the lens by restricting based on the amount of driving. The interchangeable lens according to claim 5,
A storage unit that stores third information indicating a change amount of a size of the image of the subject when the lens is driven by a predetermined amount;
An interchangeable lens wherein the amount of change in the size of the image of the subject when the lens is driven to the target drive amount is calculated based on the first information and the third information. The interchangeable lens according to claim 6,
A zoom lens that changes a focal length of the interchangeable lens,
The third information is an interchangeable lens stored in the storage unit for each of the focal lengths. The interchangeable lens according to claim 4,
When the target driving amount of the lens exceeds the driving amount of the lens corresponding to the limit value of the second information, the control unit restricts the target driving amount based on the second information, and Interchangeable lens that determines the amount of driving. The interchangeable lens according to claim 8,
A storage unit that stores third information indicating a change amount of a size of the image of the subject when the lens is driven by a predetermined amount;
An interchangeable lens, wherein a drive amount of the lens corresponding to a limit value of the second information is calculated based on the second information and the third information. The interchangeable lens according to claim 9,
A zoom lens that changes a focal length of the interchangeable lens,
The third information is an interchangeable lens stored in the storage unit for each of the focal lengths. In the interchangeable lens according to any one of claims 5 to 10,
When the target driving amount of the lens exceeds the driving amount of the lens corresponding to the limit value of the second information, the control unit restricts the target driving amount based on the second information, and Determine the driving amount of
If the target drive amount of the lens does not exceed the drive amount of the lens corresponding to the limit value of the second information, the control unit determines the drive amount of the lens based on the first information. lens. A camera body to which an interchangeable lens having a lens that can be driven in the optical axis direction can be attached,
An imaging unit that captures an image of a subject;
A communication unit configured to transmit, to the interchangeable lens, first information regarding a driving amount of the lens and second information regarding a change amount of a size of an image of the subject due to driving of the lens;
Camera body equipped with. The camera body according to claim 12,
A camera body having a camera control unit that determines a value of the second information based on a shooting mode of the camera body. The camera body according to claim 12, wherein
A camera body having a camera control unit that determines a value of the first information based on an aperture value of an aperture of the interchangeable lens.

Images