JP2010204303A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus capable of photographing a moving image by suppressing cost rise and deterioration of image quality even when using an interchangeable lens for still image photographing. <P>SOLUTION: In the imaging apparatus where data communication is performed among the interchangeable lens 134 including a diaphragm 104 whose aperture diameter is controlled on the basis of a diaphragm control value, an adapter 135 including an ND filter 138 whose insertion position is controlled on the basis of an ND filter control value and a camera body 133, the diaphragm control value and the ND filter control value are obtained so that a photometric value of a subject can continuously change when the adapter 135 is attached to the camera body 133. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an imaging apparatus in which an interchangeable lens, an adapter, and a camera body perform data communication with each other.

  Imaging devices with interchangeable lenses are becoming more sophisticated and higher in image quality, so that, like digital cameras, operations such as confirmation of the angle of view and fine focus adjustment during shooting can be performed on the display device. In addition, it is possible to shoot not only still images but also moving images, as well as a through image display function (live view function) that displays an image formed on the image sensor in real time as a moving image image (through image) on an LCD monitor. Those equipped with possible shooting functions have been developed.

In the above-described image-capturing apparatus with interchangeable lenses, it is necessary to smoothly control the optical elements in the interchangeable lens according to a change in subject luminance during moving image shooting.
However, when an interchangeable lens is developed for still image shooting, the aperture diameter of the diaphragm as an optical element in the interchangeable lens is not configured to change continuously. That is, the aperture diameter of the stop of the interchangeable lens for still image shooting is discretely controlled. For this reason, when using an interchangeable lens for still image shooting to shoot a moving image where the subject brightness changes abruptly, the aperture diameter of the aperture cannot be controlled appropriately following the change in the subject brightness. However, there is a problem that the image quality deteriorates due to a sudden change in luminance.

  Therefore, as in Patent Document 1, the camera body further includes an aperture driving device that is a mechanical mechanism for controlling the aperture diameter of the aperture in the interchangeable lens, and operates the aperture driving device following changes in subject luminance. Some control the aperture diameter of the diaphragm.

  In addition, as disclosed in Patent Document 2, there is a technique in which the shutter speed is increased when the subject brightness is high and the shutter speed is decreased when the subject brightness is low, thereby suppressing the number of times the aperture diameter is controlled.

JP 2008-197552 A JP 2004-56699 A

  In the above-mentioned Patent Document 1, the aperture diameter of the diaphragm can be controlled smoothly and the aperture diameter of the diaphragm can be appropriately controlled following the change in luminance of the subject. However, it is necessary to further include a mechanical mechanism on the camera body side. There is a problem that the cost of the camera body increases. Moreover, in the said patent document 1, only the interchangeable lens corresponding to a diaphragm drive device can be employ | adopted, and there exists a problem that versatility is low.

  Further, when the technique of Patent Document 2 is applied to an image-capturing apparatus capable of exchanging lenses, an appropriate exposure can be obtained without much depending on the control of the aperture diameter of the aperture, but when the subject brightness is high. Since a moving image is shot at a high shutter speed, there is a problem in that the image quality of the moving image thus shot is degraded.

  Therefore, an object of the present invention is to provide an imaging apparatus capable of capturing a moving image while suppressing an increase in cost and a decrease in image quality even when an interchangeable lens for capturing a still image is used.

  The imaging device of the present invention is an imaging device in which an interchangeable lens, an adapter, and a camera body perform data communication with each other via a communication path, and the aperture diameter of the interchangeable lens is discretely controlled based on an aperture control value. The adapter includes an ND filter whose insertion position is controlled based on an ND filter control value, and the camera body includes imaging means for outputting a digital image corresponding to a subject image on the imaging device; AE processing means for obtaining an appropriate exposure value corresponding to the photometric value of the subject calculated from the digital image output from the imaging means, and when the adapter is attached to the camera body, the appropriate Based on the exposure value, the aperture control value and the ND filter control value are obtained so that the photometric value of the subject changes continuously.

  The AE processing means is a program line for obtaining the ND filter control value at which the appropriate exposure value and the photometric value of the subject continuously change when the adapter is attached to the camera body. The diaphragm control value and the ND filter control value may be obtained based on the figure.

  The camera body sends the appropriate exposure value to the adapter when the adapter is attached to the camera body, and the adapter is sent from the camera body via the communication path. The aperture control value and the ND filter control value so that the photometric value of the subject changes continuously based on an appropriate exposure value and a plurality of aperture control values that can be set in the aperture that are held in advance. You may comprise so that it may obtain | require.

  According to the present invention, even when an interchangeable lens for still image shooting is used in an imaging device in which an interchangeable lens, an adapter, and a camera body perform data communication with each other, moving images can be captured while suppressing an increase in cost and a decrease in image quality. It can be carried out.

1 is a diagram illustrating an overall configuration of an imaging apparatus according to a first embodiment of the present invention. It is a figure which shows an interchangeable lens. It is a figure which shows an adapter. It is a figure which shows a camera main body. It is a figure which shows an AE process part. It is a figure which shows an example of the program diagram in case an ND filter is not used. It is a figure which shows an example of a program diagram in case an ND filter is used. It is a figure which shows the relationship between the ND filter control value when it image | photographs using the program diagram in case an ND filter is not used, and the photometry value of a to-be-photographed object. It is a figure which shows the relationship between a ND filter control value when using a program diagram in case an ND filter is used, and the photometric value of a to-be-photographed object. 3 is a flowchart for explaining the operation of the imaging apparatus according to the first embodiment. It is a figure which shows the adapter of the imaging device of 2nd Embodiment. It is a flowchart for demonstrating operation | movement of the imaging device of 2nd Embodiment.

<First Embodiment>
FIG. 1 is a diagram illustrating an overall configuration of an imaging apparatus according to a first embodiment of the present invention. Note that the imaging apparatus according to the present embodiment is capable of capturing and displaying a moving image including a still image and a through image, and reproducing a still image and a moving image.

  The imaging apparatus illustrated in FIG. 1 includes an interchangeable lens 134, an adapter 135, and a camera body 133, and the interchangeable lens 134, the adapter 135, and the camera body 133 perform data communication with each other via a communication path 126.

FIG. 2 is a diagram showing the interchangeable lens 134.
2 includes a zoom lens 101, a zoom lens driving unit 102, a focus lens 103, a diaphragm 104, a focus lens driving unit 110, a diaphragm driving unit 111, a communication path 126, and a system controller. 130 and a communication control unit 131.

The optical element of the interchangeable lens 134 includes a focus lens 103, a zoom lens 101, and a diaphragm 104.
The position of the focus lens 103 is controlled by the focus lens driving unit 110 so that light from the subject is imaged on the image sensor 106 of the camera body 133.

The focus lens driving unit 110 includes a motor and a motor driver, and driving is controlled by a focus control value obtained by the AF processing unit 116.
The zoom lens 101 changes the focal length between the focus lens 103 and the image sensor 106 when the position is controlled by the zoom lens driving unit 102.

  The zoom lens driving unit 102 includes a motor and a motor driver, and driving is controlled based on a zoom control value corresponding to the user's zoom operation information output from the UI control unit 121.

The aperture 104 adjusts the amount of light incident on the image sensor 106 by controlling the aperture diameter by the aperture drive unit 111.
The aperture driving unit 111 includes a motor and a motor driver, and driving is controlled by an aperture control value obtained by the AE processing unit 115 or the like.

FIG. 3 is a diagram showing the adapter 135.
The adapter 135 illustrated in FIG. 3 includes a communication control unit 136, a system controller 137, an ND filter 138, and an ND filter driving unit 139.

The insertion position of the ND filter 138 is controlled by the ND filter driving unit 139 in a direction perpendicular to the optical axis between the interchangeable lens 134 and the camera body 133.
The ND filter driving unit 139 includes a motor and a motor driver, and driving is controlled based on an ND filter control value obtained by the AE processing unit 115 or the like.

FIG. 4 is a diagram showing the camera body 133.
The camera body 133 includes a mechanical shutter 105, an image sensor 106, a CDS (correlated double sampling circuit) 107, an AMP 108, an A / D converter 109, a mechanical shutter driver 112, an image sensor driver 113, and a memory. 114, AE processing unit 115, AF processing unit 116, system controller 117, image processing unit 118, compression / decompression unit 119, accessory management unit 120, UI control unit 121, and shooting mode management unit 122. A system bus 123, a display control unit 124, a recording medium control unit 125, a display monitor 127, a recording medium 128, and a communication control unit 132.

The UI control unit 121 receives input information from a user interface (not shown) operated by the user and outputs the input information to the system controller 117.
The image sensor 106 has a photoelectric surface in which a large number of light receiving elements are arranged in a matrix, and a subject image formed on the photoelectric surface is photoelectrically converted by the focus lens 103. Further, the image sensor 106 has RGB color filters arranged in a mosaic pattern. In addition, the image sensor 106 reads out the electric charges accumulated for each pixel in synchronization with the vertical transfer clock signal and the horizontal transfer clock signal supplied from the image sensor driving unit 113 and outputs them as an image signal. The exposure time of charges in each pixel is controlled by an electronic shutter drive signal given from the image sensor drive unit 113. The image signal output from the image sensor 106 is subjected to noise removal by the CDS 107 and gain adjustment, then amplified by the AMP 108, converted into image data as a digital signal by the A / D converter 109, and the memory 114. Temporarily written to.

The mechanical shutter 105 adjusts the exposure time of the image sensor 106 by controlling the opening / closing operation by the mechanical shutter driving unit 112.
The mechanical shutter driving unit 112 includes a motor and a motor driver. When a pressing signal indicating that the shutter button has been pressed by the user is sent from the UI control unit 121 to the system controller 117, the mechanical shutter driving unit 112 outputs a shutter output from the system controller 117. Drive is controlled according to the control value. The mechanical shutter driving unit 112 is driven only in the still image shooting mode.

  The AF processing unit 116 obtains the in-focus position from the image data written in the memory 114 using the area information set by the UI control unit 121. Further, the AF processing unit 116 obtains a focus position for each image data continuously written in the memory 114, and obtains a focus control value for controlling the position of the focus lens 103 based on the focus position. Ask.

  The AE processing unit 115 calculates the subject brightness from the image data written in the memory 114, and controls the shutter control value for controlling the opening / closing operation of the mechanical shutter 105 based on the subject brightness or the electronic for controlling the image sensor 106. The shutter control value, the diaphragm control value for controlling the aperture diameter of the diaphragm 104, and the ND filter control value for controlling the insertion position of the ND filter 138 are obtained, and the white balance is adjusted. In the imaging apparatus according to the first embodiment, the aperture control value is sent from the communication control unit 132 of the camera body 133 to the communication control unit 131 of the interchangeable lens 134 via the communication path 126 at a predetermined timing, and the ND filter. It is assumed that the control value is sent from the communication control unit 132 of the camera body 133 to the communication control unit 136 of the adapter 135 via the communication path 126.

  The accessory management unit 120 manages the connection state and type of the interchangeable lens 134 and the adapter 135 by making an inquiry to the interchangeable lens 134 and the adapter 135 via the communication path 126.

The shooting mode management unit 122 manages a still image shooting mode, a moving image shooting mode, or a playback mode set by the user.
The image processing unit 118 performs image processing such as colorization, gamma correction, contrast correction, and edge enhancement on the image data written in the memory 114. When the image sensor 106 is a single-plate image sensor, colorization processing is necessary for image data captured by the image sensor 106. At this time, the image processing unit 118 generates a color signal by generating a luminance signal and a color difference signal from the single-plate image data by interpolation.

  The compression / decompression unit 119 performs compression processing on the image data subjected to the image processing by the image processing unit 118 in a compression format such as JPEG when capturing a still image and in a compression format such as MPEG when capturing a moving image. The compressed image data is written to the recording medium 128 controlled by the recording medium control unit 125. Further, the compression / decompression unit 119 reads the compressed image data from the recording medium 128 in the reproduction mode, and then performs decompression processing on the image data. The expanded image data is displayed on the display monitor 127 controlled by the display control unit 124.

The display control unit 124 converts the image data read from the memory 114 and decompressed into a format that can be displayed on the display monitor 127.
In the moving image shooting mode, analog signal processing and digital conversion processing are performed at predetermined intervals on the image signal output from the image sensor 106, and image data is continuously generated, and the image data is written in the memory 114. It will be. Each image data written in the memory 114 is subjected to a compression process in a predetermined compression format by the compression / decompression unit 119 after image processing, and is written in the recording medium 128. The moving image file written in the recording medium 128 is displayed on the display monitor 127 after being decompressed by the compression / decompression unit 119 in the reproduction mode.

  In addition, the focus control value obtained by the AF processing unit 116 in the moving image shooting mode is sent from the communication control unit 132 of the camera body 133 to the communication control unit 131 of the interchangeable lens 134 via the communication path 126. The system controller 130 of the interchangeable lens 134 controls the position of the focus lens 103 by controlling the driving of the focus lens driving unit 110 based on the focus control value sent to the communication control unit 131.

  In addition, the zoom operation information output from the UI control unit 121 in the moving image shooting mode is converted into a zoom control value by the system controller 117 of the camera main body 133 and then the communication path 126 from the communication control unit 132 of the camera main body 133. Via the communication control unit 131 of the interchangeable lens 134. The system controller 130 of the interchangeable lens 134 controls the position of the zoom lens 101 by controlling the driving of the zoom lens driving unit 102 based on the zoom control value sent to the communication control unit 131.

  The aperture control value obtained by the AE processing unit 115 in the moving image shooting mode is sent from the communication control unit 132 of the camera body 133 to the communication control unit 131 of the interchangeable lens 134 via the communication path 126. The system controller 130 of the interchangeable lens 134 controls the aperture diameter of the diaphragm 104 by controlling the driving of the diaphragm driving unit 111 based on the diaphragm control value sent to the communication control unit 131.

  The ND filter control value obtained by the AE processing unit 115 in the moving image shooting mode is sent from the communication control unit 132 of the camera body 133 to the communication control unit 136 of the adapter 135 via the communication path 126. The system controller 137 of the adapter 135 controls the insertion position of the ND filter 138 by controlling the driving of the ND filter driving unit 139 based on the ND filter control value sent to the communication control unit 136.

  The system controller 117 controls the shutter speed of the mechanical shutter 105 by controlling the driving of the mechanical shutter driving unit 112 based on the shutter control value obtained by the AE processing unit 115 in the still image shooting mode.

FIG. 5 is a diagram showing the AE processing unit 115.
The AE processing unit 115 illustrated in FIG. 5 includes a photometry calculation unit 201, an exposure calculation unit 202, a program diagram switching unit 203, and a controller 204.

The photometric calculation unit 201 calculates the photometric value of the subject from the image data written in the memory 114.
The program diagram switching unit 203 selects one of the program diagram when the ND filter 138 is not used and the program diagram when the ND filter 138 is used.

  The exposure calculation unit 202 is configured to select a shutter control value and an aperture control value based on an appropriate exposure value corresponding to the photometric value calculated by the photometry calculation unit 201 and the program diagram selected by the program diagram switching unit 203. The ND filter control value is obtained.

FIG. 6 is a program diagram when the ND filter 138 is not used, and FIG. 7 is a program diagram when the ND filter 138 is used.
6 and 7, the vertical axis of the upper graph indicates the sensitivity Sv of the image sensor 106, the horizontal axis of the upper graph indicates the exposure value Bv, and the vertical axis of the lower graph indicates the aperture. The control value Av is shown, and the horizontal axis of the lower graph shows the shutter control value Tv.

  The program diagram shown in FIG. 6 shows the shutter control value and the aperture control value based on the relationship of exposure value Bv + sensitivity Sv = aperture control value Av + shutter control value Tv when the aperture control value Av is set discretely. Is for seeking.

  On the other hand, the program diagram shown in FIG. 7 shows the insertion position of the ND filter 138 so that the aperture control values Av are set discretely and the photometric values respectively obtained by the aperture control values Av are interpolated. Is to obtain a shutter control value, an aperture control value, and an ND filter control value based on the relationship of exposure value Bv + sensitivity Sv = aperture control value Av + shutter control value Tv.

  For example, when the accessory management unit 120 determines that the adapter 135 is not attached to the camera body 133, the program diagram switching unit 203 selects the program diagram shown in FIG. If it is determined that the adapter 135 is attached to 133, the program diagram switching unit 203 selects the program diagram shown in FIG.

  As described above, when the program diagram shown in FIG. 6 is selected, the aperture control value Av changes discretely, so that the photometric value (log (Y)) of the subject is also discrete as shown in FIG. 8A. To change. On the other hand, when the program diagram shown in FIG. 7 is selected, the aperture control value Av is discretely controlled, but the ND filter 138 can interpolate each photometric value obtained by each aperture control value Av. Since the insertion position can be changed, the photometric value (log (Y)) of the subject can be continuously changed as shown in FIG. 8B. In FIGS. 8A and 8B, the subject brightness, sensitivity Sv, and shutter control value Tv are constant.

FIG. 9 is a flowchart for explaining the operation of the imaging apparatus according to the first embodiment.
First, when a moving image shooting start instruction is sent from the UI control unit 121 to the system controller 117 by a user operation, the system controller 117 performs various settings for moving image shooting and starts moving image shooting (S301).

  Next, the system controller 117 determines whether at least the interchangeable lens 134 of the interchangeable lens 134 and the adapter 135 is attached to the camera body 133 by controlling the operation of the accessory management unit 120 (S302).

When it is determined that at least the interchangeable lens 134 is not attached (No in S302), the system controller 117 ends the moving image shooting (S311).
On the other hand, when it is determined that at least the interchangeable lens 134 is attached (Yes in S302), the system controller 117 controls the operation of the accessory management unit 120 to inquire about the type of the interchangeable lens 134. The accessory management unit 120 holds the type of the interchangeable lens 134 (S303). In S302, when the accessory management unit 120 determines that the adapter 135 is attached, an inquiry about the type of the adapter 135 is made, and the type of the adapter 135 is held in the accessory management unit 120.

  Next, the system controller 117 controls the operations of the image sensor driving unit 113, the CDS 107, the AMP 108, and the A / D converter 109, thereby obtaining image data for obtaining an aperture control value, a focus control value, and the like. Generate and write to the memory 114 (S304).

Next, the system controller 117 determines whether or not the adapter 135 is attached to the camera body 133 based on the result of S302 (S305).
When it is determined that the adapter 135 is not attached (No in S305), the system controller 117 controls the operation of the photometry calculation unit 201 via the controller 204, thereby detecting the subject in the image data written in the memory 114. While calculating the photometric value and controlling the operation of the program diagram switching unit 203 via the controller 204, the program diagram when the ND filter 138 is not used is selected, and the exposure calculation unit 202 is selected via the controller 204. The aperture control value is calculated based on the appropriate exposure value Bv corresponding to the photometric value calculated by the photometric calculating unit 201 and the program diagram selected by the program diagram switching unit 203. Obtained (S306). The exposure value Bv obtained at this time is the exposure value Bv for moving image shooting.

Next, the system controller 117 obtains a focus control value from the image data written in the memory 114 by controlling the operation of the AF processing unit 116 (S307).
Next, the system controller 117 sends the aperture control value obtained by the AE processing unit 115 to the interchangeable lens 134 via the communication control unit 132 (S308), and performs communication control on the focus control value obtained by the AF processing unit 116. It is sent to the interchangeable lens 134 via the unit 132 (S309).

Next, the system controller 117 determines whether or not there is a moving image shooting end instruction (S310).
When it is determined that there is an instruction to end moving image shooting (S310: Yes), the system controller 117 ends moving image shooting (S311).

On the other hand, when it is determined that there is no moving image shooting end instruction (S310: No), the system controller 117 returns to S304.
When it is determined that the adapter 135 is attached (Yes in S305), the system controller 117 controls the operation of the photometric calculation unit 201 via the controller 204, so that the image data written in the memory 114 is updated. By calculating the photometric value of the subject and controlling the operation of the program diagram switching unit 203 via the controller 204, the program diagram when the ND filter 138 is used is selected, and the exposure via the controller 204 is performed. By controlling the operation of the calculation unit 202, the aperture is determined based on the appropriate exposure value Bv corresponding to the photometric value calculated by the photometry calculation unit 201 and the program diagram selected by the program diagram switching unit 203. A control value and an ND filter control value are obtained (S312). The exposure value Bv obtained at this time is the exposure value Bv for moving image shooting. For example, the exposure calculation unit 202 uses the program diagram shown in FIG. 7 to obtain the aperture control value Av closest to the appropriate exposure value Bv, and then determines the exposure value Bv corresponding to the aperture control value Av and the appropriate exposure value Bv. An ND filter control value corresponding to the difference from the exposure value Bv may be obtained.

Next, the system controller 117 obtains a focus control value from the image data written in the memory 114 by controlling the operation of the AF processing unit 116 (S313).
Next, the system controller 117 sends the aperture control value obtained by the AE processing unit 115 to the interchangeable lens 134 via the communication control unit 132 (S314), and communicates the ND filter control value obtained by the AE processing unit 115. The image is sent to the adapter 135 via the controller 132 (S315), and the focus control value obtained by the AF processor 116 is sent to the interchangeable lens 134 via the communication controller 132 (S316), and the process proceeds to S310.

  According to the imaging apparatus of the first embodiment, the aperture control value and the ND filter control value are obtained using the program diagram for changing the insertion position of the ND filter 138 so that the photometric value of the subject changes continuously. Therefore, even when the interchangeable lens 134 for still image shooting is used and the aperture diameter of the diaphragm 104 is discretely controlled, the photometric value of the subject can be continuously changed according to the change in the subject brightness. In addition, it is possible to suppress deterioration in image quality during movie shooting.

In addition, according to the imaging apparatus of the first embodiment, it is possible to suppress deterioration in image quality during moving image shooting without changing the mechanical mechanism of the interchangeable lens 134, the adapter 135, and the camera main body 133. Can increase the sex.
<Second Embodiment>
FIG. 10 is a diagram illustrating the adapter 135 in the imaging apparatus according to the second embodiment of the present invention. The overall configuration of the imaging apparatus of the second embodiment is the same as the overall configuration of the imaging apparatus shown in FIG. 1, and the configuration of the interchangeable lens 134 of the second embodiment is the same as the configuration of the interchangeable lens 134 shown in FIG. The configuration of the camera body 133 of the second embodiment is the same as that of the camera body 133 shown in FIG.

  10 includes a communication control unit 136, a system controller 137, an ND filter 138, an ND filter driving unit 139, a memory 501, an aperture information acquisition unit 502, and a filter value calculation unit 503. ing.

  The imaging apparatus of the second embodiment is different from the imaging apparatus of the first embodiment in that a plurality of aperture control values that can be set in the interchangeable lens 134 and an appropriate exposure value that is obtained in the camera body 133 are The point is that the aperture control value and the ND filter control value are obtained in the adapter 135.

  The aperture information acquisition unit 502 of the adapter 135 acquires a plurality of aperture control values that can be set in the interchangeable lens 134 via the communication control unit 136 when the interchangeable lens 134 is attached to the camera body 133, and then A plurality of aperture control values are held in the memory 501.

FIG. 11 is a flowchart for explaining the operation of the imaging apparatus according to the second embodiment.
First, when a moving image shooting start instruction is sent from the UI control unit 121 to the system controller 117 by a user operation, the system controller 117 performs various settings for moving image shooting and starts moving image shooting (S601).

  Next, the system controller 117 determines whether at least the interchangeable lens 134 of the interchangeable lens 134 and the adapter 135 is attached to the camera body 133 by controlling the operation of the accessory management unit 120 (S602).

When it is determined that at least the interchangeable lens 134 is not attached (No in S602), the system controller 117 ends the moving image shooting (S611).
On the other hand, if it is determined that at least the interchangeable lens 134 is attached (Yes in S602), the system controller 117 controls the operation of the accessory management unit 120 to inquire about the type of the interchangeable lens 134. The accessory management unit 120 holds the type of the interchangeable lens 134 (S603). In S602, when the accessory management unit 120 determines that the adapter 135 is attached, an inquiry about the type of the adapter 135 is made and the type of the adapter 135 is held in the accessory management unit 120.

  Next, the system controller 117 controls the operations of the image sensor driving unit 113, the CDS 107, the AMP 108, and the A / D converter 109, thereby obtaining image data for obtaining an aperture control value, a focus control value, and the like. At the same time, the image data is written into the memory 114 (S604).

  Next, the system controller 117 controls the operation of the AE processing unit 115 to obtain an appropriate exposure value Bv corresponding to the photometric value of the subject calculated from the image data written in the memory 114, and An aperture control value is obtained based on an appropriate exposure value Bv and a program diagram (for example, the program diagram shown in FIG. 6) when the ND filter 138 is not used (S605). The exposure value Bv obtained at this time is the exposure value Bv for moving image shooting.

  Next, the system controller 117 determines the focus control value from the image data written in the memory 114 by controlling the operation of the AF processing unit 116 (S606).

Next, the system controller 117 determines whether or not the adapter 135 is attached to the camera body 133 based on the result of S602 (S607).
When it is determined that the adapter 135 is not attached (No in S607), the system controller 117 sends the focus control value obtained by the AF processing unit 116 to the interchangeable lens 134 via the communication control unit 132 (S608). The aperture control value obtained by the AE processing unit 115 is sent to the interchangeable lens 134 via the communication control unit 132 (S609).

Next, the system controller 117 determines whether or not there is a moving image shooting end instruction (S610).
When it is determined that there is an instruction to end moving image shooting (S610: Yes), the system controller 117 ends moving image shooting (S611).

On the other hand, when it is determined that there is no moving image shooting end instruction (S610: No), the system controller 117 returns to S604.
If it is determined that the adapter 135 is attached (Yes in S607), the system controller 117 sends the focus control value obtained by the AF processing unit 116 to the interchangeable lens 134 via the communication control unit 132 (S612). ), The appropriate exposure value Bv obtained by the AE processing unit 115 is sent to the adapter 135 via the communication control unit 132 (S613).

  Next, the system controller 137 of the adapter 135 controls the operation of the filter value calculation unit 503 to thereby control a plurality of aperture control values held in the memory 501 and an appropriate exposure value sent from the camera body 133. Based on the above, the aperture control value and the ND filter control value are obtained so that the photometric value of the subject continuously changes (S614). For example, the filter value calculation unit 503 obtains the aperture control value closest to the appropriate exposure value among the plurality of aperture control values, and then calculates the difference between the exposure value corresponding to the aperture control value and the appropriate exposure value. A corresponding ND filter control value may be obtained.

  Next, the system controller 137 of the adapter 135 sends the aperture control value obtained by the filter value calculation unit 503 to the interchangeable lens 134 via the communication control unit 136 (S615), and proceeds to S610. The ND filter control value obtained by the filter value calculation unit 503 is sent to the ND filter driving unit 139, and the insertion position of the ND filter 138 is controlled based on the ND filter control value.

  According to the imaging apparatus of the second embodiment, as with the imaging apparatus of the first embodiment, the aperture control value and the ND filter control value are obtained so that the photometric value of the subject continuously changes. Even when the photographing interchangeable lens 134 is used and the aperture diameter of the diaphragm 104 is discretely controlled, the photometric value of the subject can be continuously changed according to the change in the subject brightness, and the image quality at the time of moving image shooting The decrease can be suppressed.

  Also in the image pickup apparatus of the second embodiment, it is possible to suppress degradation in image quality during moving image shooting without changing the mechanical mechanism of the interchangeable lens 134, the adapter 135, and the camera body 133. Can be increased.

DESCRIPTION OF SYMBOLS 101 Zoom lens 102 Zoom lens drive part 103 Focus lens 104 Aperture 105 Mechanical shutter 106 Image pick-up element 107 CDS
108 AMP
109 A / D converter 110 Focus lens driving unit 111 Aperture driving unit 112 Mechanical shutter driving unit 113 Image sensor driving unit 114 Memory 115 AE processing unit 116 AF processing unit 117 System controller 118 Image processing unit 119 Compression / decompression unit 120 Accessory management unit 121 UI control unit 122 shooting mode management unit 123 system bus 124 display control unit 125 recording medium control unit 126 communication path 127 display monitor 128 recording medium 130 system controller 131 communication control unit 132 communication control unit 133 camera body 134 interchangeable lens 135 adapter 136 communication Control unit 137 System controller 138 ND filter 139 ND filter drive unit 201 Photometry calculation unit 202 Exposure calculation unit 203 Program diagram switching unit 204 Controller 501 Memory 5 2 stop information acquisition unit 503 the filter value calculating unit

Claims (3)

An imaging device in which an interchangeable lens, an adapter, and a camera body perform data communication with each other via a communication path,
The interchangeable lens includes a diaphragm whose aperture diameter is discretely controlled based on a diaphragm control value,
The adapter includes an ND filter whose insertion position is controlled based on an ND filter control value,
The camera body is
Imaging means for outputting a digital image corresponding to a subject image on the imaging element;
AE processing means for obtaining an appropriate exposure value corresponding to the photometric value of the subject calculated from the digital image output from the imaging means;
With
When the adapter is attached to the camera body, the aperture control value and the ND filter control value are obtained based on the appropriate exposure value so that the photometric value of the subject changes continuously. An imaging device. The imaging apparatus according to claim 1,
The AE processing means includes a program diagram for obtaining the appropriate exposure value and the ND filter control value for continuously changing the photometric value of the subject when the adapter is attached to the camera body. An imaging device, wherein the aperture control value and the ND filter control value are obtained based on The imaging apparatus according to claim 1,
The camera body sends the appropriate exposure value to the adapter when the adapter is attached to the camera body,
The adapter measures the subject based on the appropriate exposure value sent from the camera body via the communication path and a plurality of aperture control values that can be set in the aperture held in advance. The imaging device, wherein the aperture control value and the ND filter control value are obtained so that the values continuously change.

Images