Interchangeable lens and imaging apparatus

Abstract

To make settings of an imaging system appropriate in stereo photographing.SOLUTION: An imaging system has an imaging apparatus and an interchangeable lens removably attached to the imaging apparatus. The interchangeable lens includes first and second lens units that form first and second subject images, and a communication unit that transmits information on the interchangeable lens to the imaging apparatus. The imaging apparatus includes a single image pick-up device that includes first and second imaging areas for photoelectrically converting the first and second subject images, an image processing unit that creates a stereo image including first and second images corresponding to the first and second imaging areas on the basis of output from the image pick-up device, and a setting unit that sets the first image as a reference image in displaying the stereo image as a monaural image on the basis of the information. Of the first and second lens units, only the second lens unit includes a correction mechanism that reduces the difference between the focal positions of the first and second lens units.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an interchangeable lens having a plurality of lens units. [Background technology]

[0002] A conventional method for capturing stereoscopic images involves attaching a compound lens unit, which can capture multiple images from different viewpoints, to a single-lens camera body. The camera body performs automatic exposure adjustment (AE) using a metering area near the center of the captured image. However, when a compound lens unit is attached, the centers of the left and right images differ from the centers of the images captured with a single lens, making it impossible to accurately perform automatic exposure adjustment. Patent Document 1 discloses a configuration in which the metering area when a compound lens unit is attached differs from the metering area when a single lens is attached. Furthermore, with the configuration of Patent Document 1, metering is performed near the center of either the left or right image, since performing metering near the center of each image would complicate subsequent processing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-222083 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the configuration of Patent Document 1 does not consider in advance which of the left and right image areas should be used as the photometry area, resulting in the following problem: If a camera body equipped with a compound eye lens unit is compatible with VR180, a stereoscopic VR video standard with a 180-degree angle of view, the camera is designed to display the left eye image, which serves as the reference image, when displaying a stereo image in mono. If a difference occurs between the exposure of the right eye image and the exposure of the left eye image for some reason, setting the right eye image as the photometry area could reduce the accuracy of automatic exposure adjustment of the reference image.

[0005] An object of the present invention is to provide an interchangeable lens that optimizes the exposure of a reference image displayed when a stereo image is displayed in mono. [Means for solving the problem]

[0006] An imaging system according to one aspect of the present invention comprises an imaging device and an interchangeable lens detachably attached to the imaging device, the interchangeable lens including first and second lens units that form first and second subject images, and a communication unit that transmits information related to the interchangeable lens to the imaging device, the imaging device including a single imaging element including first and second imaging areas that photoelectrically convert the first and second subject images, an image processing unit that generates a stereo image including first and second images corresponding to the first and second imaging areas based on output from the imaging element, and a setting unit that sets the first image as a reference image when displaying the stereo image in mono based on the information, and is characterized in that only the second lens unit of the first and second lens units includes a correction mechanism that reduces the difference in focus positions between the first and second lens units. [Effects of the Invention]

[0007] According to the present invention, an interchangeable lens can be provided that can optimize the exposure of a reference image displayed when a stereo image is displayed in mono. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a configuration diagram of a camera system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram illustrating the configuration of a camera control unit and a lens control unit. [Figure 3] 1 is a diagram showing the positional relationship between the optical axis position of an interchangeable lens, a mount, and an image circle on an imaging element. FIG. [Figure 4] FIG. 10 is a diagram showing a flow up to setting a photometry area. [Figure 5] FIG. 4 is an explanatory diagram of a one-eye focus correction mechanism. [Figure 6]FIG. 10 is a diagram showing a flow up to setting a photometry area when a one-eye focus correction mechanism is provided. [Figure 7] FIG. 10 is a diagram showing the relationship between the F-number and brightness of an interchangeable lens. [Figure 8] FIG. 10 is a diagram showing a flow up to setting a photometry area when one-eye aperture correction is performed. [Figure 9] FIG. 10 is a diagram showing a flow up to setting a photometry region for each posture. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same components, and redundant explanations will be omitted.

[0010] 1 is a diagram showing the configuration of a camera system according to an embodiment of the present invention. The camera system includes an interchangeable lens 100 and a camera (imaging device) 10. The interchangeable lens 100 is a compound lens unit that is detachably attached to the camera 10.

[0011] The camera 10 and the interchangeable lens 100 are respectively provided with a camera mount 24 and a lens mount 103 that include electrical contacts for supplying power from the camera 10 to the interchangeable lens 100 and for communication with each other.

[0012] The interchangeable lens 100 includes multiple lens units, including a right-eye lens unit (second lens unit) and a left-eye lens unit (second lens unit), that are arranged so as not to overlap in the optical axis direction. The interchangeable lens 100 also includes aperture units 102R and 102L and an aperture driver 105 that drives actuators that operate the aperture units 102R and 102L. The interchangeable lens 100 also includes prisms 106R, 107R, 106L, and 107L that change the direction of the optical axis by 90 degrees through reflection. The interchangeable lens 100 also includes a lens control unit (communication unit) 104 that includes a microcomputer that controls the aperture in response to a control signal received by communication from a camera control unit (setting unit) 17 in the camera 10. Note that, although this embodiment will describe a case where the multiple lens units include two lens units, the number of lens units is not limited to this.

[0013] The camera 10 includes an image sensor 11 that photoelectrically converts a subject image formed by the right eye lens unit 101R and the left eye lens unit 101L and outputs an electrical signal. The camera 10 also includes an A / D converter 12 that converts the analog electrical signal output from the image sensor 11 into a digital signal, and an image processor 13 that performs various image processing on the digital signal to generate an image. The image generated by the image processor 13 is displayed on a display unit 14 and recorded on a recording medium 18. The camera 10 also includes an operation unit 15 that includes a power switch for turning the power on and off, a shooting switch for starting image recording, and a selection / setting switch for setting various menus. The camera control unit 17 includes a microcomputer and controls the image processor 13 and communication with the interchangeable lens 100 in response to signals from the operation unit 15.

[0014] Fig. 2 is a diagram showing the configurations of the camera control unit 17 and the lens control unit 104. Fig. 2 also shows terminals for electrical connection included in the camera mount 24 and the lens mount 103.

[0015] The LCLK terminal is a terminal for a communication clock signal output from the camera 10 to the interchangeable lens 100. The DCL terminal is a terminal for communication data output from the camera 10 to the interchangeable lens 100. The DLC terminal is a terminal for communication data output from the interchangeable lens 100 to the camera 10.

[0016] The MIF terminal is a terminal for detecting that an interchangeable lens 100 has been attached to the camera 10. A microcomputer (hereinafter referred to as a camera microcomputer) 20 within the camera control unit 17 detects that an interchangeable lens 100 has been attached to the camera 10 based on the voltage of the MIF terminal.

[0017] The TYPE terminal is a terminal for detecting the type of interchangeable lens 100 attached to the camera 10. The camera microcomputer 20 detects the type of interchangeable lens 100 attached to the camera 10 based on the voltage at the TYPE terminal.

[0018] The VBAT terminal is a terminal for supplying drive power used for various operations excluding communication control from the camera 10 to the interchangeable lens 100. The VDD terminal is a terminal for supplying communication control power used for communication control from the camera 10 to the interchangeable lens 100. The DGND terminal is a terminal for connecting the communication control systems of the camera 10 and the interchangeable lens 100 to ground. The PGND terminal is a terminal for connecting mechanical drive systems including motors and the like provided in the camera 10 and the interchangeable lens 100 to ground.

[0019] The camera 10 is selectively fitted with a plurality of types of interchangeable lenses 100 that differ from one another in terms of communication voltage with the camera 10. In the following explanation, a case will be described in which the types of interchangeable lenses 100 that the camera 10 identifies based on the voltage of the TYPE terminal include a first interchangeable lens and a second interchangeable lens that has a different communication voltage from the first interchangeable lens.

[0020] A camera power supply unit 21 in the camera control unit 17 converts the battery voltage supplied from a battery (not shown) mounted in the camera 10 into a voltage required for the operation of each circuit. In this case, the camera power supply unit 21 generates a first voltage V1, a second voltage V2, a third voltage V3, and a power supply voltage VM.

[0021] The first voltage V1 is a power supply voltage for communication control of the first and second interchangeable lenses and is also a communication voltage for the first interchangeable lens. The second voltage V2 is a communication voltage for the second interchangeable lens. The third voltage V3 is a power supply voltage for operating the camera microcomputer 20. The power supply voltage VM is a power supply voltage for driving the first and second interchangeable lenses.

[0022] When the power switch 22 is turned on, the camera microcomputer 20 starts supplying power for communication control and power for driving to the interchangeable lens 100. When the power switch 22 is turned off, the camera microcomputer 20 stops supplying power for communication control and power for driving to the interchangeable lens 100.

[0023] The camera microcomputer 20 communicates with the interchangeable lens 100 via a voltage conversion unit 23. The camera microcomputer 20 has an LCLK_OUT terminal that outputs a communication clock signal, a DCL_OUT terminal that outputs communication data to the interchangeable lens 100, and a DLC_IN terminal that receives input of communication data from the interchangeable lens 100.

[0024] The camera microcontroller 20 also has a MIF_IN terminal for detecting the attachment of the interchangeable lens 100, a TYPE_IN terminal for identifying the type of interchangeable lens 100, and a CNT_V_OUT terminal for outputting a communication voltage switching signal to the voltage conversion unit 23.

[0025] Furthermore, the camera microcomputer 20 includes a CNT_VDD_OUT terminal that outputs a power supply signal for the power switch 22, a connection terminal with the image processing unit 13, and a connection terminal with the operation unit 15.

[0026] The lens control unit 104 includes a microcomputer (hereinafter referred to as a lens microcomputer) 111, a lens type determination unit 113, and a lens power supply unit 114.

[0027] The lens microcomputer 111 communicates with the camera microcomputer 20 via the voltage conversion unit 23. The lens microcomputer 111 has an LCLK_IN terminal that receives input of a communication clock signal, a DLC_OUT terminal that outputs communication data to the camera 10, a DCL_IN terminal that receives input of communication data from the camera 10, and a connection terminal with the aperture drive unit 105.

[0028] The detection of attachment of the interchangeable lens 100 to the camera 10 will now be described. The MIF_IN terminal of the camera microcomputer 20 is pulled up to the power supply by a resistor R (100 KΩ), so when the interchangeable lenses (first and second interchangeable lenses) 100 are not attached, its voltage value is H (High). When the interchangeable lenses (first and second interchangeable lenses) 100 are attached, the MIF_IN terminal is connected to GND in the interchangeable lens 100, so its voltage value is L (Low) regardless of the type of interchangeable lens 100.

[0029] FIG. 3 is a diagram showing the positional relationship between the positions of the optical axes of the interchangeable lens 100, the mount, and the image circle (imaging area) on the imaging element 11.

[0030] On the image sensor 11, a right-eye image circle ICR with an effective angle of view formed by the right-eye lens unit 101R and a left-eye image circle ICL with an effective angle of view formed by the left-eye lens unit 101L are formed in parallel. To minimize overlap between the image circles, the distance between the image circles can be set based on the diameter ΦD2 of the image circles. For example, consider the light receiving range of the image sensor 11 divided into left and right halves at the center, and desirably set the center of the right-eye image circle ICR to be located at the center of the right half of the light receiving range, and set the center of the left-eye image circle ICL to be located at the center of the left half of the light receiving range.

[0031] In addition, the optical system of this embodiment is a full-circle fisheye lens, and the image formed on the imaging surface is a circular image that captures a range of angle of view exceeding 180 degrees, with two circular images formed on the left and right as shown in Figure 3.

[0032] Here, the optical axis before reflection by the prisms 106R and 106L is referred to as the first optical axis, the optical axis after reflection by the prisms 106R and 106L is referred to as the second optical axis, and the optical axis after reflection by the prisms 107R and 107L is referred to as the third optical axis. The distance between the first optical axis OA1R of the right eye lens unit 101R and the first optical axis OA1L of the left eye lens unit 101L is referred to as the base length L1. The longer the base length L1, the greater the stereoscopic effect when viewed.

[0033] For example, the sensor size of the imaging element 11 is 24 mm long x 36 mm wide, the diameter of the image circle is Φ17 mm, the distance L2 between the third optical axes is 18 mm, and the length of the second optical axis is 21 mm. If the optical element is positioned so that the second optical axis extends horizontally (parallel to the imaging surface), the base length L1 is 60 mm, which is approximately equal to the interpupillary distance of an adult. Furthermore, the diameter ΦD of the lens mount 103 may be shorter than the base length L1. Furthermore, by making the distance L2 between the third optical axes shorter than the diameter ΦD of the lens mount 103, the optical element positioned on the third optical axis can be positioned inside the lens mount 103. In other words, the relationship L1 > ΦD > L2 is established.

[0034] When viewing in VR, it is said that the angle of view that provides a three-dimensional effect is about 120 degrees, but because a 120-degree field of view can feel unnatural, the angle of view is often widened to 180 degrees. In this embodiment, the effective angle of view exceeds 180 degrees, so the diameter ΦD2 of the image circle in this embodiment is longer than the diameter ΦD3 of the image circle when the angle of view is 180 degrees. In other words, the relationship ΦD2>ΦD3 holds.

[0035] FIG. 4 shows the flow up to setting the photometry area executed at startup. When the camera 10 equipped with the interchangeable lens 100 supports VR180, a stereoscopic VR video standard with a 180-degree angle of view, it is designed to display a left-eye image as a reference image when displaying a stereo image in mono. If a difference in exposure between the right-eye image and the left-eye image occurs for some reason, setting a photometry area for the right-eye image may reduce the accuracy of the automatic exposure adjustment (AE) for the left eye. Therefore, the lens control unit 104 transmits information to the camera 10 for photometry using the left-eye image circle ICL shown in FIG. 3 to properly perform automatic exposure adjustment of the reference image used (displayed) when displaying a stereo image captured by the camera 10 in mono. Here, a stereo image refers to an image obtained by multiple lens units.

[0036] 4(a) shows the flow of the lens control unit 104. In step S401, the lens control unit 104 transmits information (ID) indicating whether or not the interchangeable lens 100 is compatible with VR180 to the camera control unit 17. In this embodiment, if the ID is 1, this indicates that the interchangeable lens 100 is compatible with VR180, and if the ID is 0, this indicates that the interchangeable lens 100 is not compatible with VR180.

[0037] FIG. 4(b) shows the flow of the camera control unit 17. In step S402, the camera control unit 17 receives information (ID) from the lens control unit 104 indicating whether or not the interchangeable lens 100 is compatible with VR180. In step S403, the camera control unit 17 determines whether or not the interchangeable lens 100 is compatible with VR180 (ID is 1). If it is determined that the interchangeable lens 100 is compatible with VR180 (ID is 1), the process proceeds to step S405, and if it is determined that the interchangeable lens 100 is not compatible with VR180 (ID is 0), the process proceeds to step S404. In step S404, the camera control unit 17 sets the image circle obtained by the monocular lens as the photometry area. In step S405, the camera control unit 17 sets the left eye image circle ICL as the photometry area.

[0038] With the above configuration, it is possible to properly adjust the exposure of the reference image displayed when a stereo image captured by an imaging device is displayed in mono.

[0039] In a compound eye lens unit, deviations in focus between the left and right eyes may occur due to variations in the imaging surface tilt caused by individual differences in cameras and changes in reliability (temperature, humidity, impact, etc.). For example, as shown in Figure 5(a), it is ideal for the imaging surface of the image sensor 11 not to be tilted. However, due to individual differences in the camera 10, the imaging surface may be tilted as shown in Figure 5(b). In the state of Figure 5(b), even if you try to focus, the left and right optical systems move in the same way, so it is not possible to focus the left and right simultaneously.

[0040] In this embodiment, the right eye lens unit 101R is equipped with a single-eye focus correction mechanism (correction mechanism) that aligns the focus position of the right eye with the focus position of the left eye (corrects the difference in focal length) by the user rotating an eccentric roller connected to a screw. This allows only the right eye lens unit 101R to move toward the subject or the photographer without moving the left eye lens unit 101L.

[0041] However, when the focus position for the right eye is moved, the amount of light may change due to the tilt of the optical axis. If the right eye image circle ICR is set as the photometry area when the amount of light for the right eye changes, the accuracy of automatic exposure adjustment for the left eye may decrease. Therefore, in this embodiment, the image circle obtained by a lens unit that does not have a single-eye focus correction mechanism is set as the photometry area.

[0042] FIG. 6 is a diagram showing a flow up to setting the photometry area when a one-eye focus correction mechanism executed at startup is provided.

[0043] 6(a) shows the flow of the lens control unit 104. In step S601, the lens control unit 104 transmits information (ONE_EYE_COR ID) indicating whether the one-eye focus correction mechanism is provided in the right eye lens unit 101R or the left eye lens unit 101L to the camera control unit 17. In this embodiment, when ONE_EYE_COR ID is 1, it indicates that the one-eye focus correction mechanism is provided in the right eye lens unit 101R. Also, when ONE_EYE_COR ID is 0, it indicates that the one-eye focus correction mechanism is provided in the left eye lens unit 101L.

[0044] 6(b) shows the flow of the camera control unit 17. In step S602, the camera control unit 17 receives information (ONE_EYE_COR ID) from the lens control unit 104 indicating whether the one-eye focus correction mechanism is provided in the right eye lens unit 101R or the left eye lens unit 101L. In step S603, the camera control unit 17 determines whether the one-eye focus correction mechanism is provided in the right eye lens unit 101R (ONE_EYE_COR ID is 1). If it is determined that the one-eye focus correction mechanism is provided in the right eye lens unit 101R (ONE_EYE_COR ID is 1), the process proceeds to step S605. If it is determined that the one-eye focus correction mechanism is not provided in the right eye lens unit 101R (ONE_EYE_COR ID is 0), the process proceeds to step S604. In step S604, the camera control unit 17 sets the right eye image circle ICL as the photometry area. In step S605, the camera control unit 17 sets the left eye image circle ICL as the photometry area.

[0045] With the above configuration, even if the amount of light changes due to the one-eye focus correction mechanism, the exposure of the reference image displayed when stereo images captured by the imaging device are displayed in mono can be made appropriate.

[0046] 7 is a diagram showing the relationship between the F-number and brightness of the interchangeable lens 100. 701 shows the relationship between the F-number and brightness of the left eye lens unit 101L. 702 shows the relationship between the F-number and brightness of the right eye lens unit 101R before single-eye aperture correction, which corrects the brightness of either the right eye image circle ICR or the left eye image circle ICL. 703 shows the relationship between the F-number and brightness of the right eye lens unit 101R after single-eye aperture correction.

[0047] In the interchangeable lens 100, variations in aperture accuracy between the left and right eyes may occur due to individual variations in aperture units. When variations in aperture accuracy occur, a difference in brightness occurs between the image circles of the left and right eyes, as shown by 701 and 702 in FIG. 7 . Therefore, single-eye aperture correction is required to eliminate the difference in brightness between the image circles of the left and right eyes relative to the left eye. However, to comply with CIPA standards, the aperture accuracy in the fully open state is adjusted with priority given to the F-number. Therefore, as shown by 703 in FIG. 7 , the change in light intensity on the right eye side when the aperture is narrowed one stop from the fully open state, or when the aperture is narrowed one stop from the fully open state, may become distorted. When single-eye aperture correction is performed, if the right-eye image circle ICR is set as the photometry area, the accuracy of automatic exposure adjustment for the left eye side may be reduced. Therefore, in this embodiment, single-eye aperture correction is performed on a lens unit that is not used when displaying stereo images captured by an imaging device in mono.

[0048] FIG. 8 is a diagram showing a flow up to setting the photometry area when one-eye aperture correction is executed.

[0049] 8(a) shows the flow of the lens control unit 104. In step S801, the lens control unit 104 transmits information (ONE_EYE_APE ID) indicating whether the luminance of the right eye image circle ICR or the left eye image circle ICL is to be corrected to the camera control unit 17. In this embodiment, when ONE_EYE_APE ID is 1, it indicates that the luminance of the right eye image circle ICR is to be corrected. Also, when ONE_EYE_APE ID is 0, it indicates that the luminance of the left eye image circle ICL is to be corrected.

[0050] 8(b) shows the flow of the camera control unit 17. In step S602, the camera control unit 17 receives information (ONE_EYE_APE ID) from the lens control unit 104 indicating whether the luminance of the right eye image circle ICR or the left eye image circle ICL is to be corrected. In step S803, the camera control unit 17 determines whether the luminance of the right eye image circle ICR is to be corrected (ONE_EYE_APE ID is 1). If it is determined that the luminance of the right eye image circle ICR has been corrected (ONE_EYE_APE ID is 1), the process proceeds to step S805, and if it is determined that the luminance of the right eye image circle ICR has not been corrected (ONE_EYE_APE ID is 0), the process proceeds to step S804. In step S804, the camera control unit 17 sets the right eye image circle ICL as the photometry area. In step S805, the camera control unit 17 sets the left eye image circle ICL as the photometry area.

[0051] With the above configuration, even when one-eye aperture correction is performed, it is possible to properly adjust the exposure of the reference image displayed when a stereo image captured by an imaging device is displayed in mono.

[0052] The interchangeable lens 100 is equipped with an aperture unit 102L in a normal orientation on the left eye side and an aperture unit 102R in an upside-down orientation on the right eye side. The aperture units vary in aperture accuracy due to differences in orientation in the pitch direction. Setting a photometry area in an image circle obtained by a lens unit equipped with an aperture unit with low aperture accuracy may reduce the accuracy of automatic exposure adjustment. Therefore, in this embodiment, the lens control unit 104 transmits information (PHO ID) to the camera 10 indicating which image circle the camera control unit 17 should set as the photometry area depending on the orientation of the interchangeable lens 100.

[0053] FIG. 9 is a diagram showing a flow up to setting a photometry region for each posture.

[0054] FIG. 9(a) shows the flow of the lens control unit 104. In step S901, the lens control unit 104 acquires the attitude of the interchangeable lens 100 detected by an acceleration sensor or the like. In step S902, the lens control unit 104 determines whether the attitude of the interchangeable lens 100 is upside down. If it is determined that it is upside down, the process proceeds to step S903; if it is determined that it is not upside down, the process proceeds to step S904. In step S903, the lens control unit 104 transmits information (information in which PHO ID is 1) to the camera control unit 17 for setting the right eye image circle ICR as the photometry area. In step S904, the lens control unit 104 transmits information (information in which PHO ID is 0) to the camera control unit 17 for setting the left eye circle ICL as the photometry area.

[0055] 9(b) shows the flow of the camera control unit 17. In step S905, the camera control unit 17 receives information (PHO ID) indicating which image circle is to be set as the photometry region from the lens control unit 104. In step S906, the camera control unit 17 determines whether the information (PHO ID) indicating which image circle is to be set as the photometry region is 0. If it is determined that the information (PHO ID) indicating which image circle is to be set as the photometry region is 0, the process proceeds to step S907; if it is determined that the information (PHO ID) indicating which image circle is to be set as the photometry region is not 0, the process proceeds to step S908. In step S907, the camera control unit 17 sets the left eye circle ICL as the photometry region. In step S908, the camera control unit 17 sets the right eye circle ICR as the photometry region.

[0056] With the above configuration, it is possible to properly adjust the exposure of the reference image displayed when a stereo image captured by the imaging device is displayed in mono, depending on the attitude of the interchangeable lens 100.

[0057] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0058] 10 Camera (imaging device) 11 Image sensor 100 interchangeable lenses 101R Right Eye Lens Unit (Second Lens Unit) 101L Left eye lens unit (first lens unit) 104 Lens control unit (communication unit)

Claims

1. An imaging system having an imaging device and an interchangeable lens that is detachable from the imaging device, The interchangeable lens is first and second lens units for forming first and second subject images; a communication unit that transmits information about the interchangeable lens to the imaging device, The imaging device is a single image sensor including first and second image pickup areas for photoelectrically converting the first and second object images; an image processing unit that generates a stereo image including first and second images corresponding to the first and second imaging areas based on an output from the imaging element; a setting unit that sets the first image as a reference image when the stereo image is displayed in mono based on the information, An imaging system, wherein only the second lens unit of the first and second lens units includes a correction mechanism that reduces a difference in focus position between the first and second lens units.

2. An imaging system having an imaging device and an interchangeable lens that is detachable from the imaging device, The interchangeable lens is first and second lens units for forming first and second subject images; a communication unit that transmits information about the interchangeable lens to the imaging device, The imaging device is a single image sensor including first and second image pickup areas for photoelectrically converting the first and second object images; an image processing unit that generates a stereo image including first and second images corresponding to the first and second imaging areas based on an output from the imaging element; a setting unit that sets the first imaging area as a photometric area for automatic exposure adjustment for the first and second imaging areas when acquiring the stereo image based on the information, An imaging system, wherein only the second lens unit of the first and second lens units includes a correction mechanism that reduces a difference in focus position between the first and second lens units.

3. 3. The imaging system according to claim 1, wherein the information indicates that the interchangeable lens complies with the VR180 standard.

4. 3. The imaging system according to claim 1, wherein the information indicates that the correction mechanism is provided in the second lens unit.

5. 3. The imaging system according to claim 1, wherein the second lens unit includes an aperture unit that performs correction to reduce the difference in luminance between the first and second imaging areas by changing the luminance in the second imaging area.

6. 6. The imaging system according to claim 5, wherein the information indicates that the correction is performed by the aperture unit.

7. 3. The imaging system according to claim 1, wherein the first lens unit includes a first aperture unit corresponding to a normal position of the interchangeable lens, and the second lens unit includes a second aperture unit corresponding to a position that is upside down with respect to the normal position.

8. 8. The imaging system according to claim 7, wherein the information indicates that the interchangeable lens is in a normal position.

9. An imaging device to which an interchangeable lens can be attached and detached, the image device including first and second lens units that form first and second subject images, a single image sensor including first and second image pickup areas for photoelectrically converting the first and second object images; an image processing unit that generates a stereo image including first and second images corresponding to the first and second imaging areas based on an output from the imaging element; a setting unit that sets the first image as a reference image when the stereo image is displayed in mono on the basis of information about the interchangeable lens received from the interchangeable lens, An imaging device, characterized in that only the second lens unit of the first and second lens units includes a correction mechanism that reduces a difference in focus position between the first and second lens units.

10. An imaging device to which an interchangeable lens can be attached and detached, the image device including first and second lens units that form first and second subject images, a single image sensor including first and second image pickup areas for photoelectrically converting the first and second object images; an image processing unit that generates a stereo image including first and second images corresponding to the first and second imaging areas based on an output from the imaging element; a setting unit that sets the first imaging area as a photometric area in automatic exposure adjustment for the first and second imaging areas when acquiring the stereo images, based on information about the interchangeable lens received from the interchangeable lens, An imaging device, characterized in that only the second lens unit of the first and second lens units includes a correction mechanism that reduces a difference in focus position between the first and second lens units.

Images