JP6989018B2 - Imaging device - Google Patents

Description

The present invention relates to an image pickup apparatus.

Cameras that display images for monitors called live view images are known. Further, when the brightness of the subject changes, the aperture of the photographing lens is frequently driven for exposure compensation (see Patent Document 1). Therefore, there is a problem that the brightness of the screen of the live view image changes due to the frequent drive of the aperture.

Japanese Patent Application Laid-Open No. 2018-33061

According to one aspect of the present invention, the image pickup apparatus includes an image pickup element that captures an image of a subject formed by an optical system having a diaphragm and outputs a signal, and a display unit that displays an image generated based on the signal. An operation unit that instructs the image pickup by the image pickup element by operation, a calculation unit that calculates a first aperture value that is a diaphragm value for photography based on the operation of the operation unit based on the signal, and the first. Based on the difference between the aperture value of No. 1 and the second aperture value which is the value of the aperture for shooting for through image display in which an image based on a signal repeatedly captured by the image pickup element is displayed on the display unit. It has a control unit that controls to change the aperture value of 2 based on the first aperture value and a control unit that does not change the second aperture value.

It is a perspective view which illustrates the camera system. It is a block diagram explaining the main part structure of the camera of FIG. 3 (a) to 3 (d) are diagrams illustrating a first aperture value and a second aperture value. 4 (a) to 4 (d) are diagrams illustrating a first aperture value and a second aperture value. 5 (a) to 5 (c) are diagrams illustrating a first aperture value and a second aperture value. It is a flowchart explaining an example of the process which the body side control part executes in the live view mode.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the camera system 1 before the interchangeable lens 3 is attached to the camera body 2 according to the embodiment of the invention. The camera body 2 and the interchangeable lens 3 are coupled by the bayonet structure of the body side mount 210 and the lens side mount 310. When the camera body 2 and the interchangeable lens 3 are coupled, the terminals provided on each mount are physically in contact with each other, and the camera body 2 and the interchangeable lens 3 are electrically connected to each other. As will be described later with reference to FIG. 2, the camera body 2 includes an operation member 280 such as a release button and an image sensor 260.
Although FIG. 1 illustrates an interchangeable lens type camera system 1, the camera system 1 may be a camera or a video camera in which a camera body and a lens are integrated.

FIG. 2 is a block diagram illustrating a configuration of a main part of the camera system 1 according to the first embodiment.
<Interchangeable lens>
The interchangeable lens 3 includes a lens side mount 310, a lens side control unit 330, a lens side communication unit 340, a lens side storage unit 350, a photographing lens 360, a lens drive unit 370, and an aperture drive unit 380.

The lens-side terminal holding portion 320 is provided on the annular lens-side mount 310. The lens-side terminal holding portion 320 has a plurality of lens-side terminals in an arc shape centered on the optical axis O. The plurality of lens-side terminals are, for example, attachment detection terminals that inform the camera body 2 that the interchangeable lens 3 is attached to the camera body 2, and are used for communication between the interchangeable lens 3 and the camera body 2. It includes a plurality of communication terminals, a power supply terminal for supplying power from the camera body 2 to the interchangeable lens 3, a ground terminal, and the like.

The lens side control unit 330 is composed of a microcomputer and its peripheral circuits and the like. The lens-side control unit 330 executes a control program stored in the lens-side storage unit 350 to control each unit of the interchangeable lens 3. The lens-side control unit 330 is connected to the lens-side communication unit 340, the lens-side storage unit 350, the lens drive unit 370, and the aperture drive unit 380.

The lens-side communication unit 340 performs predetermined communication with the body-side communication unit 240 with the interchangeable lens 3 mounted on the camera body 2. The lens-side communication unit 340 is connected to the lens-side control unit 330 and the lens-side terminal described above. By communication performed between the lens side communication unit 340 and the body side communication unit 240 via the contact lens side terminal and the body side terminal, the lens control unit 330 gives an instruction to move the lens 361 or the like, which will be described later, by the lens control unit 330. It will be done. Further, a transmission request for transmitting information in the interchangeable lens 3 such as information indicating the state of the lens driving unit 370 is sent from the camera body 2 to the lens control unit 330 of the interchangeable lens 3.

The information indicating the state of the lens driving unit 370 described above is, for example, information indicating a state in which the lens driving unit 370 is driving the lens 361. On the other hand, data indicating the position of the lens 361 after movement, the state of the driving unit in the interchangeable lens 3, data read from the lens side storage unit 350, information on the shooting distance and the shooting magnification, and the like are contained in the interchangeable lens 3. It is transmitted to the camera body 2 as information.

The lens-side storage unit 350 is composed of a non-volatile storage medium. The lens-side storage unit 350 is controlled to record and read data by the lens-side control unit 330. In addition to storing the control program executed by the lens-side control unit 330, the lens-side storage unit 350 stores data indicating the model name of the interchangeable lens 3 (also referred to as model name information), the focal length of the photographing lens 360, and aberrations. Stores data showing optical characteristics such as information. The data stored in the lens storage unit 350 may include an error tolerance value based on the difference in optical characteristics between the first aperture value and the second aperture value, which will be described in detail later.

The photographing lens 360 guides the subject light to the image pickup surface of the image pickup element 260 of the camera body 2. The optical axis O of the photographing lens 360 coincides with the center of the lens side mount 310 and the body side mount 210. The photographing lens 360 is composed of a plurality of lenses 361 including a focusing lens and a zoom lens, and an aperture 362. Although the lens 361 has a plurality of lenses, it is shown as one lens in FIG. 2 for simplification. At least a part of the photographing lens 360 is configured to be able to move forward and backward in the optical axis O direction by a lens driving unit 370 or a manual operation.
For example, the focusing lens is configured to be able to move forward and backward in the optical axis O direction by the lens driving unit 370. By moving the focusing lens, the focal position of the photographing lens 360 is adjusted.

The diaphragm 362 is a so-called aperture diaphragm having a plurality of diaphragm blades, and by driving the diaphragm blades, the aperture diameter (aperture value) of the photographing lens 360 is changed to adjust the amount of light incident on the image pickup element 260. The aperture drive unit 380 drives the aperture blades to change the aperture diameter (aperture value).
The diaphragm drive unit 380 is composed of a stepping motor and a diaphragm drive mechanism. The aperture drive unit 380 drives the aperture blades of the aperture 362 to change the aperture diameter based on the instruction from the lens side control unit 330. Further, the diaphragm drive unit 380 detects the aperture value of the diaphragm 362 by measuring the drive amount of the diaphragm blade using an encoder provided near the diaphragm blade or a pulse counter.

The lens drive unit 370 is configured by a lens drive mechanism including a stepping motor. The lens drive unit 370 moves the focusing lens constituting the lens 361 along the direction of the optical axis O by the drive signal output from the lens side control unit 330. The moving direction, moving amount, moving speed, and the like of the focusing lens are instructed by, for example, the body side control unit 230. The lens drive unit 370 detects the position of the focusing lens by a drive step of an encoder or a stepping motor provided near the lens.

<Camera body>
The camera body 2 includes a body-side mount 210, a body-side control unit 230, a body-side communication unit 240, a power supply unit 250, an image sensor 260, a signal processing unit 270, an operation member 280, and a display unit 290. Further, the recording unit 100 is configured to be detachable from the camera body 2.

The body-side mount 210 in an annular shape is provided with a body-side terminal holding portion 220. The body-side terminal holding portion 220 has a plurality of body-side terminals. The plurality of body-side terminals are, for example, a mounting detection terminal for transmitting that the interchangeable lens 3 is mounted, a plurality of communication terminals used for communication between the camera body 2 and the interchangeable lens 3, and a camera body 2. A power supply terminal for supplying power to the interchangeable lens 3 and a ground terminal are included.

The body-side control unit 230 has a storage unit 235, and is composed of a microcomputer and peripheral circuits thereof. The body-side control unit 230 executes a control program stored in the storage unit 235 to control each unit in the camera body 2. The body-side control unit 230 is connected to the body-side communication unit 240, the power supply unit 250, the image sensor 260, the signal processing unit 270, the operation member 280, the display unit 290, the recording unit 100, and the above-mentioned mounting detection terminal.

The storage unit 235 provided in the body-side control unit 230 is controlled to record and read data by the body-side control unit 230. The storage unit 235 stores the control program or the like executed by the body-side control unit 230, and also stores the model name information of the interchangeable lens 3 received by the body-side communication unit 240, data indicating the optical characteristics of the interchangeable lens 3, and the like. Can be remembered.

The body-side communication unit 240 performs the above-mentioned communication with the lens-side communication unit 340 in a state where the interchangeable lens 3 is attached to the camera body 2. The body-side communication unit 240 is connected to the body-side control unit 230 and the above-mentioned communication terminal.
The power supply unit 250 converts the voltage of the battery (not shown) into the voltage used in each part of the camera system 1 and supplies it to each part of the camera body 2 and the interchangeable lens 3. The power supply unit 250 can switch between power supply on and off for each power supply destination according to an instruction from the body side control unit 230. The power supply unit 250 is connected to the body side control unit 230 and the power supply terminal described above.

The image pickup device 260 is a solid-state image pickup device such as a CMOS image sensor or a CCD image sensor in which pixels are arranged two-dimensionally in the row direction and the column direction. The image sensor 260 captures a subject image on the image pickup surface by a control signal from the body side control unit 230 and outputs an image pickup signal. The image sensor 260 is connected to the body-side control unit 230 and the signal processing unit 270.

The image pickup device 260 has an image generation pixel (referred to as an image pickup pixel) and a focus detection pixel (referred to as a focus detection pixel) arranged on the image pickup surface. The signal generated by the image pickup pixel (hereinafter referred to as an image pickup pixel signal) is used for image data generation by the signal processing unit 270 described later. Further, the signal generated by the focus detection pixel (hereinafter referred to as a focus detection pixel signal) is the image formation state of the image by the interchangeable lens 3 on the image pickup element 260 image pickup surface by the signal processing unit 270 described later, in other words, described later. It is used in the focus detection process to detect the amount of defocus.
It should be noted that the image pickup device 260 may be configured to have a plurality of photoelectric conversion units and a pixel that outputs a signal that can be used for both image pickup and focus detection.

The signal processing unit 270 performs predetermined image processing on the image pickup pixel signal output from the image pickup pixel of the image pickup element 260 to generate image data. The generated image data is recorded in the recording unit 100 in a predetermined file format, or is used for image display by the display unit 290. The signal processing unit 270 is connected to the body side control unit 230, the image sensor 260, and the display unit 290.

Further, the signal processing unit 270 calculates the defocus amount of the interchangeable lens 3 by the phase difference detection method using the focus detection pixel signal output from the focus detection pixel of the image pickup element 260. The defocus amount is the amount of deviation between the position of the image of the subject formed by the interchangeable lens 3 (imaging surface) and the position of the image pickup surface of the image pickup device 260. The signal processing unit 270 is a focusing lens up to the focusing position, which is the position of the focusing lens when an image of a specific subject is formed on the image pickup surface of the image pickup element 260 by the interchangeable lens 3 based on the calculated defocus amount. Calculate the amount of movement of.

The body-side control unit 230 also functions as a photometric calculation unit. The body-side control unit 230 detects the brightness information (Bv value) of the subject based on the image pickup pixel signal input from the image pickup element 260 to the signal processing unit 270. The body-side control unit 230 has an aperture value (Av value), a shutter speed (Tv value), and a shooting sensitivity (Sv value) based on the Bv value and the information of the program diagram stored in the storage unit 235. To determine. The shooting sensitivity, also called ISO sensitivity, is the gain at the time of photoelectric conversion in the image sensor 260. The Av value, Tv value, and Sv value are values calculated by apex calculation according to the shooting mode.

The recording unit 100 is a memory card as a non-volatile storage medium. The recording unit 100 is attached to an insertion portion (not shown) provided inside from the exterior surface of the camera body 2. The recording unit 100 is controlled by the body-side control unit 230 to record and read image data.

The operation member 280 including the release button, various operation switches, and the like is provided on the exterior surface of the camera body 2. By operating the operation member 280, the user sets the shooting mode and the like, and sets the live view mode described later.
The shooting mode setting is the setting of whether the image to be shot is a still image or a moving image, the above-mentioned Av value, Tv value and Sv value are all automatically determined by the camera, or the above-mentioned Av value, It is a setting such as whether the user decides a part or all of the Tv value and the Sv value by himself / herself.
The release button has a two-step pressing operation of half-pressing and full-pressing. When the full push operation is performed, an image pickup instruction is given to the body side control unit 230, and an image imaged by the image sensor 260 and generated by the signal processing unit 270 is stored in the recording unit 100. The half-press operation is a push-down operation up to about half of the push-down amount at the time of full-press, and a shooting preparation operation is performed.

The display unit 290 includes, for example, an organic EL or a liquid crystal display panel. The display unit 290 displays an image based on the image data processed by the signal processing unit 270, an operation menu screen, and the like according to an instruction from the body side control unit 230. The display unit 290 is connected to the body side control unit 230 and the signal processing unit 270.
Further, the display unit 290 can also display a so-called live view image that dynamically and sequentially displays image data based on signals repeatedly imaged by the image sensor 260. This live view image display may have a lower image quality than the image generated by imaging by pressing the release button fully.
The live view image display is performed with the power of the camera system 1 turned on in a shooting mode other than the reproduction mode and the setting mode.
In the present embodiment, the display of the live view image has the following three live view modes, and any of the live view modes can be selected.

The first live view mode is a display of a live view image that emphasizes the legibility of the displayed image without reflecting various settings at the time of shooting set by the user. The first live view mode is a mode in which a live view image is generated and an exposure calculation is performed based on an image pickup pixel signal, and a focus detection process is performed based on a focus detection pixel signal.
The various settings at the time of shooting according to the user settings are settings such as shutter speed, aperture value, and exposure in order to obtain the desired image effect of the user. When the aperture value is set large (aperture aperture is narrowed down), a bright image is displayed in the first live view mode in order to emphasize the visibility of the live view image without narrowing down to the aperture value for which the aperture is set. That is, in the first live view mode, the aperture is limited to a predetermined value (the aperture value for live view, which is the second aperture value described later) that enables accurate distance measurement calculation from the image pickup signal that generates the live view image. Do not squeeze. This first live view mode is a mode in which the live view image to be displayed is displayed in a state as close as possible to an optical finder (so-called OVF). Therefore, in the first live view mode, even if the user has set the exposure compensation, the live view image is displayed without considering the exposure compensation set by the user. More specifically, even if the user sets the exposure compensation of -1/3 step, the image displayed in the live view is not a dark image.

The second live view mode is a display of a live view image that reflects various settings at the time of actual shooting set by the user. Similar to the first live view mode, this mode performs live view image generation and exposure calculation based on the image pickup pixel signal, and performs focus detection processing based on the focus detection pixel signal. In the second live view mode, the image is displayed on the display unit 290 by simulating the exposure at the time of the main shooting based on the setting at the time of the main shooting. However, in order to enable distance measurement calculation from the image pickup signal that generated the live view image, the aperture value is limited to a predetermined value (a second aperture value to be described later, the aperture value for live view) that can measure the aperture. The image to be displayed as a live view image is made a dark image by image processing. As described above, the first live view mode does not necessarily reflect the user's settings, but in the second live view mode, for example, when the user has set the exposure compensation, the live view image is displayed by the user. Display by reflecting the set exposure compensation. More specifically, when the user has set the exposure compensation of -1/3 step, the image displayed in the live view is 1/3 step darker.

The third live view mode is a mode in which all the shooting settings set by the user are reflected in the displayed live view image. In the third live view mode, various operations for main shooting are not performed. In the third live view mode, when a large aperture value is set as the setting at the time of main shooting, the aperture is stopped down to the set aperture value for imaging. Therefore, the image displayed in the live view becomes dark, but the depth of field of the set aperture value can be confirmed, and the actual shooting can be previewed.

In the present embodiment, in the above-mentioned camera system 1, when the live view mode is one of the first and second live view modes, the live view image is displayed on the display unit 290, and the image pickup pixel signal and the image pickup pixel signal are displayed. The body-side control unit 230 performs exposure calculation, calculation of defocus amount, and the like based on the focus detection pixel signal. The exposure calculation and the defocus amount calculation are repeated during the live view display. The calculated exposure calculation result is used for various settings for imaging for the subsequent live view image and shooting by pressing the release button. The defocus amount calculated during the display of the live view image is used to instruct the driving of the focusing lens when the release button is half-pressed.
Hereinafter, a case will be described in which the aperture value at the time of shooting is automatically determined by the body side control unit 230 from the exposure calculation result by the setting of the operation unit. That is, as the shooting mode, a program automatic exposure calculation mode, a shutter speed priority exposure calculation mode, or a fully automatic mode in which the sensitivity is set by calculation is set.

<Two aperture values>
The body-side control unit 230 sets two aperture values. The first aperture value is the first aperture value (also referred to as an aperture value for photography) applied at the time of pressing (fully pressed) the release button constituting the operation member 280 and imaging (main shooting), and is described above. This is a value based on the apex exposure calculation.

The second aperture value will be described in detail later with reference to FIGS. 3 to 5, but the second aperture value is applied to the time of imaging for displaying the live view image on the display unit 290, that is, the exposure calculation and the calculation of the defocus amount. Aperture value (also called aperture value for live view).
The second aperture value should be smaller (the aperture is open) than the first aperture value. This is because the depth of focus (permissible range of distance measurement) of the subject image changes when the aperture value of the aperture 362 of the photographing lens 360 changes. When the aperture value of the aperture 362 is small (open the aperture), the depth of focus is shallow, and when the aperture value is large (close the aperture), the depth of focus is deep. Therefore, if the defocus amount is calculated with an aperture value (aperture) larger than the aperture value set in the main shooting, an accurate value cannot be calculated. Further, since the best image plane due to the aberration of the photographing lens 360 changes depending on the aperture value, the aperture (second aperture value) at the time of calculating the defocus amount is the aperture value (first aperture value) at the time of shooting. It is even better if it is the same as.
Following the change in the brightness of the subject, the first aperture value changes by the exposure calculation. However, when the brightness of the subject changes frequently, if the second aperture value in the live view display is frequently changed in accordance with the change in the first aperture value to drive the aperture blades, the aperture drive is driven. The sound (driving sound) emitted by the unit 380 tends to be a problem. Further, flickering of the live view image due to a sudden change in the brightness of the image displayed on the display unit 290 tends to be a problem.

In the live view mode, the body-side control unit 230 according to the present embodiment calculates a control value including the first aperture value based on the photometric value, and stores each calculated value in the storage unit 235. .. The body-side control unit 230 instructs the aperture drive unit 380 to drive the aperture 362 so that the first aperture value stored in the storage unit 235 is obtained when the release button is fully pressed. Take a picture and get an image for recording.

Further, in the present embodiment, the body side control unit 230 has a first aperture value so that the aperture 362 is not frequently driven when the live view image is captured even if the brightness of the subject changes frequently. The second aperture value with less change than the change of is calculated. During the live view display, the aperture 362 is driven so as to have the second aperture value, and the live view image is acquired.

When the live view image is acquired, the body-side control unit 230 recalculates the control value including the first aperture value based on the new metering value, and stores the calculated values in the storage unit 235 for updating. Further, the body-side control unit 230 also recalculates the second aperture value, and stores the calculated value in the storage unit 235 for updating. When the release button is not pressed (fully pressed), the body-side control unit 230 drives the aperture 362 so that the aperture value of the aperture 362 becomes the second aperture value stored in the storage unit 235. , Get a live view image.

<Calculation of the first and second aperture values>
The calculation of the first aperture value and the second aperture value in the live view mode will be described in more detail.
3 (a) to 3 (d) are diagrams illustrating a first aperture value and a second aperture value. The upper line indicates the first aperture value (shooting aperture value), and the lower line indicates the second aperture value (live view aperture value). The units of the first aperture value and the second aperture value are the exposure calculation value (apex calculation value), respectively, the open side aperture value is Av1, and the small diameter side aperture value is displayed up to Av6. The open value and the minimum value of the aperture 362 may be appropriately changed for each model of the interchangeable lens 3, for example. The first aperture value and the second aperture value calculated by the body-side control unit 230 are represented by the positions of triangles (▽) on each line.
In the example of FIG. 3A, the calculated first aperture value (shooting aperture value) is Av4, and the second aperture value (live view aperture value) is Av3.5.

The body-side control unit 230 accumulates and controls the image sensor 260 in synchronization with, for example, the frame rate of the live view display. Then, as described above, the Bv value is obtained based on the signal value (also referred to as the photometric value) of the image pickup pixel signal generated by the image pickup pixel of the image sensor 260 by the accumulation. Further, the first aperture value (Av value), shutter speed (Tv value), and sensitivity (Sv value) are determined based on the Bv value and the information of the program diagram stored in the storage unit 235. The first aperture value (Av value), shutter speed (Tv value), and sensitivity (Sv value) are stored in the storage unit 235 as control values.
The body-side control unit 230 calculates the control value including the first aperture value (Av value) every time the image pickup pixel signal of the image pickup element 260 is input to the signal processing unit 270. The control value is updated and recorded in the storage unit 235.

When the body side control unit 230 calculates the first aperture value (Av value) for the first time in the live view mode, it is on the open side from the first aperture value (Av value), for example, the permissible range for one step in the apex value. (Displayed as a dashed square) is set. As described above, since the control unit 230 calculates the defocus amount by the focus detection pixel signal of the live view image, the depth of focus of the subject image is shallower than the first aperture value set for shooting. The aperture value is set as the second aperture value. In the present embodiment, the range between the first aperture value itself and the one-step open side of the first aperture value is set as the range for setting the second aperture value, and this is referred to as an allowable range. There is. Then, as the first second aperture value (Av value), an intermediate value within the allowable range (aperture value of 1/2 step from the open side) is determined. In the example of FIG. 3A, the first aperture value (aperture value for shooting) is Av4, so the second aperture value (aperture value for live view) is intermediate with Av3 on the one-step open side of Av4. It is determined to be the value Av3.5.
As an allowable range, the apex value exemplifies one step on the open side, but it is not limited to one step, and may be two steps or 0.5 step on the open side. Alternatively, the upper limit (small diameter side) and the lower limit (open side) of the allowable range may be different depending on the information (focal length, open aperture value, etc.) of the interchangeable lens 3.
Further, an example of determining the intermediate value of the allowable range as the second aperture value (Av value) will be described, but a value that is not exactly the intermediate value of the range (for example, 1/3 step from the open side, or 5/6 step, etc.) will be described. ) May be the second aperture value (Av value).

FIG. 3B is a diagram illustrating a first aperture value and a second aperture value when the brightness of the subject is brighter than that in the state of FIG. 3A. As described with reference to FIG. 3A, the body-side control unit 230 determines the first aperture value (Av value).

In the state of FIG. 3B, the first aperture value (shooting aperture value) is changed to the smaller diameter side (larger Av value) than in the state of FIG. 3A, and the first aperture value is Av4. 4, and the allowable range of the second aperture value (indicated by the broken line quadrangle) based on the first aperture value also moves to the smaller diameter side accordingly. In the body side control unit 230, the second aperture value (Av value) determined in the state of FIG. 3 (a) last time is an allowable range based on the first aperture value calculated this time (broken line quadrangle in FIG. 3 (b)). (Displayed in) to determine if it is included. Since Av3.5 set in the previous time (FIG. 3 (a)) is within the permissible range (Av3.4 to 4.4) for one step this time, the second aperture value (Av) in FIG. 3 (a). The value) is not changed and remains at Av3.5. By maintaining the second aperture value (Av value), the frequency of driving the aperture 362 in the live view mode can be suppressed.

FIG. 3 (c) is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject becomes brighter than that in the state of FIG. 3 (b). The body-side control unit 230 determines the first aperture value (Av value).

In the state of FIG. 3 (c), the first aperture value (Av value) is changed to the smaller diameter side than in the state of FIG. 3 (b), the first aperture value is Av 4.8, and the first aperture. The permissible range of the second aperture value based on the value (indicated by the broken line rectangle) also moves to the smaller diameter side. The body-side control unit 230 maintains a second aperture value (dotted triangle Av3.5) in FIG. 3A based on the first aperture value (Av4.8) calculated this time. Since it deviates from the permissible range of values (Av 3.8 to 4.8 indicated by the broken line rectangle in FIG. 3 (c)), the second aperture value (Av value) is changed to the smaller diameter side. Av4.3 (indicated by a solid triangle), which is an intermediate value of the allowable range (Av3.8 to 4.8) of the second aperture value calculated this time, is determined as the second aperture value (Av value).

FIG. 3D is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject becomes brighter than that in the state of FIG. 3 (c). The body-side control unit 230 determines the first aperture value (Av value).

In the state of FIG. 3 (d), the first aperture value (Av value) is changed to the smaller diameter side than in the state of FIG. 3 (c), the first aperture value is Av 5.8, and the first aperture. The permissible range of the second aperture value based on the value (indicated by the broken line rectangle) also moves to the smaller diameter side. In the body side control unit 230, the second aperture value (Av value) in FIG. 3C determined at the time of the previous calculation is the second aperture value based on the first aperture value (Av4.8) calculated this time. Since it deviates from the permissible range (displayed by the broken line rectangle in FIG. 3D) Av 4.8 to 5.8, the second aperture value (Av value) is changed to the smaller diameter side, and the intermediate value of the newly virtual range is set. Attempts to determine the second aperture value (Av value).

However, in the present embodiment, the small diameter side of the second aperture value (Av value) is limited to Av5. The reason why the limit value is set on the small diameter side of the second diaphragm value (Av value) is that the smaller the aperture diameter of the diaphragm 362, the lower the detection accuracy of the above-mentioned image shift amount (phase difference). Since a decrease in the detection accuracy of the phase difference leads to a decrease in the focus detection accuracy, in the present embodiment, by setting a limit value on the small diameter side of the second aperture value (Av value) (Av5 in this example), the live performance is performed. It suppresses the decrease in focus detection accuracy in view mode.
Therefore, in FIG. 3 (d) where the brightness of the subject is further brighter than that in the state of FIG. 3 (c), the permissible range of the second aperture value is Av 4.8 to 5.8 as shown by the broken line quadrangle. Yes, the median value is Av5.3, but the second aperture value that is actually set is the limit value Av5 on the small diameter side indicated by the black-painted triangle (▼).
The limit value on the small diameter side of the second aperture value (Av value) may be appropriately changed for each model of the interchangeable lens 3, for example.

FIG. 4A is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject becomes brighter than that in the state of FIG. 3D. The body-side control unit 230 determines the first aperture value (Av value).

In the state of FIG. 4A, the first aperture value (Av value) is changed to the smaller diameter side as compared with the state of FIG. 3D, the first aperture value is Av6.8, and the first aperture. The permissible range of the second aperture value based on the value (indicated by the broken line quadrangle) also moves to the smaller diameter side. The body-side control unit 230 indicates that the maintained second aperture value (Av5) is within the allowable range of the second aperture value based on the first aperture value calculated this time (displayed by the broken line quadrangle in FIG. 4A). Although the second aperture value (Av value) deviates from Av 5.8 to 6.8, it is maintained at Av 5, which is the limit value on the small diameter side of the second aperture value (Av value). Even when the subject is brighter than in the state of FIG. 3 (d), the second aperture value in FIG. 4 (a) is the limit value on the small diameter side indicated by the black triangle (▼). It remains Av5.

By the way, if the small diameter side of the second aperture value (Av value) is limited, the live view image displayed on the display unit 290 may become bright (overexposed state). In the first live view mode described above, in order to suppress such a change in the brightness of the display screen, the body-side control unit 230 shortens the exposure time (accumulation time, Tv value) of the image sensor 260, or reduces the sensitivity. It is advisable to lower (Sv value). By such control, it is possible to suppress a change in the brightness of the live view image displayed on the display unit 290. As described above, in the first live view mode, the user's settings (exposure compensation, etc.) are not reflected in the process of suppressing such a change in the brightness of the display screen, but in the second live view mode, the user The exposure time (accumulation time, Tv value) and sensitivity (Sv value) are determined in consideration of the setting (exposure compensation, etc.).

FIG. 4B is a diagram illustrating a first aperture value and a second aperture value when the brightness of the subject is darker than that in the state of FIG. 4A.

In the state of FIG. 4B, the first aperture value (Av value) is changed to the open side as compared with the state of FIG. 4A, and the first aperture value is Av6. Along with this, the allowable range of the second aperture value based on the first aperture value (indicated by the broken line rectangle) also moves to the open side. The body-side control unit 230 has a permissible range of the second aperture value based on the first aperture value calculated this time by Av5, which was set and maintained in FIG. 4 (a) last time (displayed by the broken line rectangle in FIG. 4 (b)). Since it is within Av5-6) and the intermediate value Av5.5 of the allowable range is on the smaller diameter side than the limit value (Av5), the second aperture value (Av value) is maintained at the limit value Av5. do. In FIG. 4B, a black triangle (▼) indicates that the second aperture value is maintained at the limit value Av5 on the small diameter side.

FIG. 4 (c) is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject is further darkened than in the state of FIG. 4 (b).

In the state of FIG. 4 (c), the first aperture value (Av value) is changed to the open side as compared with the state of FIG. 4 (b), and the first aperture value is Av 4.8. Since the first aperture value (Av value) has been changed to the open side, the allowable range of the second aperture value (indicated by a broken line rectangle) based on the first aperture value also moves to the open side. The second aperture value (Av value) of FIGS. 4A and 4B maintained by the body-side control unit 230 at the limit value Av5 on the small diameter side indicated by the dotted triangle is the second aperture value (Av value) calculated this time. Allowable range of the second aperture value based on the aperture value of 1 (indicated by the broken line rectangle in FIG. 4C) If it deviates from Av 3.8 to 4.8, the second aperture value (Av value) is set to the open side. Change to. In the state of FIG. 4 (c), the median value Av4.3 (solid line of FIG. 4 (c)) of the allowable range (Av 3.8 to 4.8) of the second aperture value based on the first aperture value Av5 calculated this time. (Triangle) is determined as the second aperture value (Av value).

FIG. 4D is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject is further darkened than in the state of FIG. 4 (c).

In the state of FIG. 4 (d), the first aperture value (Av value) is changed to the open side from the state of FIG. 4 (c), and the second aperture is based on the first aperture value. The value allowance (displayed as a dashed square) also moves to the open side. In the body side control unit 230, the second aperture value Av4.3 of FIG. 4 (c) determined at the time of the previous calculation is the permissible range of the second aperture value based on the first aperture value calculated this time (FIG. 4 (FIG. 4). d) Displayed as a broken line quadrangle) Since it is included in Av3.5 to 4.5, the second aperture value Av4.3 of FIG. 4C determined at the time of the previous calculation is maintained unchanged. By maintaining the second aperture value (Av value), the frequency of driving the aperture 362 in the live view mode can be suppressed.

FIG. 5A is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject is further darkened than in the state of FIG. 4D.

In the state of FIG. 5A, the first aperture value (Av value) is changed to the open side as compared with the state of FIG. 4B, and the first aperture value is Av2.5. In the body side control unit 230, the current second aperture value (Av4.3 shown by a broken line triangle in FIG. 5A) is calculated as the first aperture value (Av2.5 in FIG. 5A). If it is larger than, the second aperture value is set to the first aperture without comparing the current second aperture value (Av value) with the allowable range of the second aperture value based on the first aperture value. It is set to be smaller than the value. As described above, the control unit 230 calculates the defocus amount by the focus detection pixel signal of the live view image, so that the first setting is set for shooting. The aperture value whose focal depth of the subject image is shallower than the aperture value is set as the second aperture value. Therefore, the first aperture value Av2.5 newly calculated this time maintains the second aperture value Av4. Since it is located on the open side of 3, the intermediate value (Av2) of the allowable range (Av1.5 to 2.5) of the second aperture value based on the first aperture value calculated this time is set to the second aperture value (Av). Value).

FIG. 5B is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject is further darkened than in the state of FIG. 5 (a).

In the state of FIG. 5 (b), the first aperture value (Av value) is changed to the open side as compared with the state of FIG. 5 (a), and the first aperture value is Av 2.2. Along with this, the allowable range of the second aperture value based on the first aperture value (indicated by a broken line rectangle) also moves to the open side. In the body side control unit 230, the second aperture value Av2 in FIG. 5A determined at the time of the previous calculation is the permissible range Av1.2 to 2.2 of the second aperture value based on the first aperture value calculated this time. Since it is included in 2 (displayed as a broken line quadrangle in FIG. 5 (b)), the second aperture value Av2 in FIG. 5 (a) determined at the time of the previous calculation is maintained unchanged. By maintaining the second aperture value (Av value), the frequency of driving the aperture 362 in the live view mode can be suppressed.

FIG. 5 (c) is a diagram illustrating a first diaphragm value and a second diaphragm value when the brightness of the subject is further darkened than in the state of FIG. 5 (b). In the state of FIG. 5 (c), the first aperture value (Av value) is changed to Av2 on the open side from the state of FIG. 5 (b), and the virtual range (displayed as a broken line rectangle) is also moved to the open side. It moves and becomes Av1 ~ 2.

Here, in the present embodiment, it is assumed that the open upper limit value of the aperture 362 is Av2. That is, the open aperture value of the interchangeable lens 3 is Av2 (F value is 2). The body side control unit 230 is when the first aperture value (Av value) calculated based on the Bv value and the information of the program diagram stored in the storage unit 235 is on the open side of the open upper limit value. Maintains the first aperture value (Av value) at the open value. When the first aperture value (Av value) is set to the open value, the second aperture value (Av value) is also set to the same open value as the first aperture value (Av value). In FIG. 5 (c), the black-painted triangle (▼) indicates an open value.

As described above, in the present embodiment, in order to suppress the frequency of driving the aperture 362 in the live view mode, the second aperture value, which is the aperture value for live view, is set to the first aperture value, which is the aperture value for shooting. It is always set to the open side of the aperture value, and is controlled so that the second aperture value (Av value) is not changed as much as possible even if the brightness of the subject changes.

<Explanation of flowchart>
An example of the process executed by the body-side control unit 230 when the above-mentioned live view mode is one of the first and second live view modes will be described with reference to the flowchart of FIG. The body-side control unit 230 is activated, for example, when the main switch is turned on, or shifts to a sleep operation when no operation state continues for a predetermined time, but the sleep operation is released by an operation of the operation member 280. Then, the process according to the flowchart of FIG. 6 is started. The release of the sleep operation (return to the normal state) is performed when the switch or the like constituting the operation member 280 is operated. The operation may be, for example, a half-press operation on the release button. FIG. 6 describes a process of displaying the live view by turning on the power or canceling the sleep operation, but the live view display is repeated until the release button is fully pressed.

In step S10, the body-side control unit 230 controls the exposure setting in the live view mode to a predetermined value (initial value), and performs storage control for the image sensor 260. For example, the interchangeable lens 3 is instructed to drive the aperture 362 to a predetermined initial value (corresponding to the second aperture value), and the accumulation time and sensitivity of the image sensor 260 in the image pickup for live view are set to the predetermined initial values. Is controlled to perform the accumulation operation for capturing the live view image of the first frame.

In step S20, the body-side control unit 230 causes the signal processing unit 270 to read a signal from the image sensor 260, and proceeds to step S30. The body-side control unit 230 calculates the first aperture value (shooting aperture value) and the second aperture value (live view aperture value) by performing the exposure calculation in step S30. That is, the body-side control unit 230 detects the brightness information (Bv value) of the subject based on the image pickup pixel signal input to the signal processing unit 270, and stores the Bv value and the program stored in the storage unit 235. The shooting aperture value (first aperture value, Av value), shutter speed (Tv value), and sensitivity (Sv value) are determined based on the information in the diagram. Further, the body-side control unit 230 calculates an allowable range of the second aperture value separately from the first aperture value. Each control value including the calculated first aperture value and the allowable range of the second aperture value is stored in the storage unit 235.

Further, in step S30, the body side control unit 230 also calculates the defocus amount. The body-side control unit 230 causes the signal processing unit 270 to calculate the defocus amount as described above by using the signal output from the focus detection pixel of the image sensor 260.
In the present embodiment, the defocus amount is calculated in step S30, but the focusing lens is not driven yet at this point.

In step S40, the body-side control unit 230 sets the aperture 362 to the second aperture value (aperture value for live view) as described with reference to FIGS. 3 to 5, and then displays the live view. The body-side control unit 230 causes the signal processing unit 270 to generate a live view image using the image pickup pixel signal output from the image sensor 260, and causes the display unit 290 to display the generated live view image.

In step S50, the body-side control unit 230 determines whether or not the release button has been half-pressed. The body-side control unit 230 positively determines step S50 when the release button is half-pressed, and proceeds to step S60. If the release button is not half-pressed, the body-side control unit 230 returns to step S10.

In step S60, the body-side control unit 230 attaches the focusing lens constituting the lens 361 to the interchangeable lens 3 along the direction of the optical axis O based on the defocus amount calculated in step S30 by the signal processing unit 270. Move it. That is, the lens side control unit 330 instructs the lens drive unit 370 to drive the focusing lens, and the focusing drive operation is performed. Then, the process proceeds to step S70.

In step S70, the body-side control unit 230 determines whether or not the release button has been fully pressed. When the release button is fully pressed, the body-side control unit 230 positively determines step S70 and proceeds to step S80, and when the release button is not fully pressed, the body-side control unit 230 negatively determines step S70 and returns to step S10.

The body-side control unit 230 that has returned to step S10 performs the processing after step S10 again. The exposure settings for the second and subsequent frames in the live view mode include the second aperture value stored in the storage unit 235, and the shutter speed (Tv value) and sensitivity (Sv value) stored in the storage unit 235. Is used. Here, it is assumed that at least one of the shutter speed (Tv value) and the sensitivity (Sv value) stored in the storage unit 235 may be corrected. The reason for this is that, as described above, the brightness of the live view image displayed on the display unit 290 may change as the brightness of the subject changes, so that the shutter speed (Tv value) and sensitivity (Sv value) This is to adjust the brightness of the displayed live view image by correcting.

In step S80, which proceeds when the release button is fully pressed (affirmative determination in step S70), the body-side control unit 230 causes a storage operation for capturing an image for recording. At that time, the aperture 362 stored in the storage unit 235 is set to the first aperture value (aperture value for shooting, Av value), and the shutter speed calculated by the apex calculation and stored in the storage unit 235 (shutter speed). The storage control of the image pickup element 260 is performed by the Tv value), and the sensitivity (Sv value) processing that is also calculated by the apex calculation and stored in the storage unit 235 is performed.

In step S90, the body-side control unit 230 reads a signal from the image sensor 260 to the signal processing unit 270 and proceeds to step S100. In step S100, the body-side control unit 230 causes the signal processing unit 270 to perform predetermined image processing on the image pickup pixel signal output from the image pickup element 260 to generate an image for recording. As a result, the signal processing unit 270 performs predetermined image processing to generate an image for recording.

In step S110, the body-side control unit 230 displays an image. That is, the body-side control unit 230 causes the display unit 290 to display the image processed by the signal processing unit 270 in step S100.
In step S120, the body-side control unit 230 causes the recording unit 100 to record the image file processed by the signal processing unit 270.

In step S130, the body-side control unit 230 determines whether or not the live view mode has ended. When the live view mode ends, the body-side control unit 230 positively determines step S130 and ends the process according to FIG. If the live view mode does not end, the negative determination in step S130 is made and the process returns to step S10.
Here, when the live view mode ends, it means that the power is turned off, the menu is displayed on the display unit 290 by the user's operation, the live view does not need to be displayed due to the transition to the sleep operation, or the like. That is.

The display process (S100) and the record process (S110) in FIG. 6 may be performed in the same order or in parallel.
Further, in the present embodiment, the defocus amount is calculated in step S30, and the focusing lens is driven in step S60 after the half-press operation is performed in step S50. The focusing lens may be driven.

In any of the first and second live view modes of the above-described embodiment, the following effects are obtained.
(1) The camera system (camera system 1) composed of the camera body 2 and the interchangeable lens 3 provided with the aperture 362 calculates the first aperture value, which is the aperture value for shooting, based on the photometric value. It includes a side control unit 230 and a body side control unit 230 that sets a second aperture value, which is an aperture value for live view, within an allowable range of the aperture value based on the first aperture value. With this configuration, even if the brightness of the subject changes and the first aperture value changes, if the second aperture value is set within the allowable aperture value range, the changed first aperture value The second aperture value that is set is maintained without changing immediately in conjunction with the value. As a result, it is possible to suppress frequent driving of the aperture 362 in the live view mode, and it is possible to reduce the driving sound. In addition, since the frequency of changing the aperture is reduced, the durability of the aperture mechanism of the lens can be improved (durable wear can be suppressed). Suppressing the drive of the aperture 362 in the live view mode is also preferable in terms of suppressing the flicker of the screen of the display unit 290 that displays the live view image. Furthermore, it is also preferable in that the hunting phenomenon at the time of metering caused by repeating the driving of the aperture 362 is avoided.

(2) Since the aperture value allowable range of the above second aperture value is set based on the first aperture value, the aperture value limit range is set within an appropriate range corresponding to the brightness of the subject. Can be set.

(3) The permissible aperture value range of the second aperture value (aperture value for live view) is always provided on the open side of the first aperture value (aperture value for shooting). In general, the larger the aperture diameter (larger diameter side) of the aperture 362, the shallower the depth of focus of the subject image as described above, so that the detection accuracy of the image shift amount (phase difference) is improved. In the present embodiment, by setting the aperture value limiting range on the side (open side) where the aperture diameter of the aperture 362 is larger than the first aperture value, the accuracy of phase difference detection and the focus detection accuracy are lowered. Can be suppressed.

(4) When the brightness of the subject changes and the first aperture value is updated (newly calculated), the body-side control unit 230 updates the aperture value allowable range of the second aperture value. .. Further, the body-side control unit 230 does not change the second aperture value when the set (previously calculated) second aperture value is within the updated aperture limit range. With this configuration, the frequency of driving the aperture 362 in the live view mode can be suppressed.

(5) In the body side control unit 230, the first aperture value (aperture value for shooting) newly calculated by changing the brightness of the subject is the second aperture value set by the previous calculation result. When it is on the open side, the second aperture value (aperture value for live view) is set on the open side of the calculated first aperture value. Then, the aperture allowable range of the second aperture value is updated, and the second aperture value is reset (updated) in the updated aperture limit range. With this configuration, the aperture value limit range is set on the open side of the aperture 362 rather than the first aperture value, and the drive of the aperture 362 in the live view mode is suppressed without degrading the accuracy of focus detection accuracy. be able to.

(6) The permissible aperture value range of the second aperture value (aperture value for live view) is on the open side of the first aperture value (in the present embodiment, one step is open from the first aperture value). Set to side). Then, the body side control unit 230 sets the newly set second aperture value to substantially the center of the aperture value allowable range. Therefore, in the present embodiment, it is not necessary to reset (update) the second aperture value unless the brightness information of the subject increases or decreases by 0.5 step or more in the apex value. Since it is configured in this way, the frequency of driving the diaphragm 362 can be appropriately suppressed.

(7) The body-side control unit 230 changes the upper and lower limits of the aperture value allowable range of the second aperture value according to the information of the interchangeable lens 3. With this configuration, it is possible to set an appropriate value according to, for example, the optical characteristics of the lens 361.

(8) The information of the interchangeable lens 3 is at least one of an error tolerance value, a shooting distance, and a shooting magnification based on the difference in optical characteristics between the first diaphragm value and the second diaphragm value. With this configuration, the upper and lower limits of the aperture value limit range can be set appropriately.

(9) The camera body 2 of the camera system 1 calculates a first aperture value (aperture value for shooting) and a second aperture value (aperture value for live view) by the body side control unit 230, and a second aperture value. A body-side control unit 230 is provided to instruct the interchangeable lens 3 to drive the aperture 362 to the aperture value of. With this configuration, the camera body 2 can perform calculations on the camera body 2 side, and the camera body 2 can transmit an instruction to drive the aperture 362 to the second aperture value to the interchangeable lens 3.
(10) The body-side control unit 230 sets the aperture value allowable range of the second aperture value to an autofocus mode (for example, a mode in which the focus position is fixed during half-pressing once the shutter button is pressed halfway to focus once. It may be changed by the mode) in which the focusing operation is repeated while the button is pressed halfway. Even in the manual mode, the aperture may be controlled within the allowable range of the second aperture value.

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)
The processing executed by the camera system (camera system 1) of the above-described embodiment may be appropriately shared by the body-side control unit 230 on the camera body 2 side and the lens-side control unit 330 on the interchangeable lens 3 side. good.
For example, the first aperture value and the second aperture value may be calculated on the camera body side, and the driving force for driving the aperture 362 on the interchangeable lens side may be transmitted from the camera body to the interchangeable lens. That is, in the camera body 2A, the body-side control unit 230 that calculates the first aperture value and the second aperture value, and the drive mechanism of the aperture 362 provided in the interchangeable lens 3A drive the aperture 362 to the second aperture value. It is provided with an actuator for generating power for the purpose and a transmission member for transmitting power to the interchangeable lens 3A. With this configuration, it is possible to suppress the driving of the aperture 362 in the live view mode in the camera system.

(Modification 2)
Further, the camera body may be configured to calculate the first aperture value and the second aperture value and transmit the second aperture value from the camera body to the interchangeable lens. When the interchangeable lens receives the second aperture value, the aperture drive unit 380 drives the aperture 362 to the second aperture value. That is, the interchangeable lens 3B includes a lens-side communication unit 340 that receives the second aperture value set by the body-side control unit 230 of the camera body 2, an aperture drive unit 380 that drives the aperture 362, and an aperture drive unit 380. A lens-side control unit 330 that instructs the drive of the aperture 362 to the second aperture value received by the lens-side communication unit 340 is provided. With such a configuration, in the camera system, the frequency of driving the aperture 362 in the live view mode can be appropriately suppressed.

In the above description, the lens control unit 330 has described an example in which the aperture 362 is controlled by the aperture value (Av value) based on the apex calculation, but the lens control unit 330 uses the aperture value of the interchangeable lens 3 as the aperture value. It may be controlled by using the value of the number of aperture stages from the open aperture value.

(Modification 3)
In the camera system (camera system 1) of the above-described embodiment, the body-side control unit 230 of the camera body 2 calculates two aperture values, a first aperture value and a second aperture value, and exchanges them via the communication unit. The configuration is such that two aperture values, a first aperture value and a second aperture value, are transmitted to the lens side control unit 330 of the lens 3. However, the present invention is not limited to this, and the body-side control unit 230 may calculate only the first aperture value and transmit only the first aperture value to the lens-side control unit 330 via the communication unit. In that case, the lens side control unit 330 autonomously sets the second aperture value. That is, in the lens side control unit 330 of the interchangeable lens 3, the second aperture value, which is the aperture value for live view, is set within the allowable aperture range based on the first aperture value received from the camera body 2.
Similar to the above embodiment, the aperture value allowable range of the second aperture value (aperture value for live view) set by the lens side control unit 330 is larger than the first aperture value (aperture value for shooting). Always on the open side. Then, the lens side control unit 330 of the interchangeable lens 3 compares the first aperture value transmitted from the camera body 2 with the currently set second aperture value. Similar to the above-described embodiment, the lens-side control unit 330 receives even if the first aperture value received from the camera body 2 changes, as long as the second aperture value is set within the allowable aperture value range. The configuration is such that the second aperture value set is maintained without changing immediately in conjunction with the first aperture value. Similar to the above embodiment, the lens side control unit 330 of the interchangeable lens 3 sets the aperture value allowable range of the second aperture value (aperture value for live view) from the first aperture value (aperture value for photography). If you set the aperture to the open side by one step and set the newly set second aperture value to the center of the aperture value tolerance range, unless the brightness information of the subject increases or decreases by 0.5 steps or more in the apex value. It is not necessary to reset (update) the second aperture value. With this configuration, the frequency of driving the diaphragm 362 can be appropriately suppressed.
Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other aspects considered within the scope of the technical idea of the present invention are also included within the scope of the present invention.

The disclosure of the following priority basic application is incorporated here as a quotation.
Japanese Patent Application No. 2018-135197 (filed on July 18, 2018)

1 ... Camera system, 2 ... Camera body, 3 ... Interchangeable lens, 230 ... Body side control unit, 235 ... Storage unit, 240 ... Body side communication unit, 270 ... Signal processing unit, 290 ... Display unit, 330 ... Lens side control Unit, 340 ... Lens side communication unit, 350 ... Lens side storage unit, 360 ... Shooting lens, 362 ... Aperture, 370 ... Lens drive unit, 380 ... Aperture drive unit

Claims (6)

An image sensor that captures an image of a subject formed by an optical system with an aperture and outputs a signal,
A display unit that displays an image generated based on the signal, and a display unit.
An operation unit that instructs the image sensor to take an image by operation,
Based on the signal, the calculation unit that calculates the first aperture value, which is the aperture value for shooting based on the operation of the operation unit,
Based on the difference between the first aperture value and the second aperture value, which is the aperture value for shooting for through image display, in which an image based on a signal repeatedly captured by the image sensor is displayed on the display unit. A control unit that controls to change the second aperture value based on the first aperture value and controls not to change the second aperture value.
Imaging device with. When the first aperture value is larger than the second aperture value and the difference between the first aperture value and the second aperture value is larger than the first value, the control unit may use the second aperture value. Control to change the aperture value based on the first aperture value.
The imaging device according to claim 1. The control unit determines that the first aperture value is larger than the second aperture value and the difference between the first aperture value and the second aperture value is equal to or less than the first value. Control not to change the aperture value of
The imaging device according to claim 1 or 2. When the first aperture value becomes smaller than the second aperture value, the control unit changes the second aperture value based on the first aperture value.
The imaging device according to any one of claims 1 to 3. When the second aperture value is changed based on the first aperture value, the control unit changes the second aperture value to a value smaller than the first aperture value.
The imaging device according to any one of claims 1 to 4. A detection unit that detects the deviation between the position of the image of the subject and the image sensor based on the signal, and
Have,
The control unit repeatedly performs imaging by the image pickup device, calculation of the first aperture value, display of the display unit, and detection of the deviation amount, and when the operation unit is operated, the optical system of the optical system is operated. Imaging is performed by changing the aperture to the first aperture value.
The imaging device according to any one of claims 1 to 5.

Images