JP2019219586A - Interchangeable lens and determination method - Google Patents

Abstract

To reduce burden on a camera body that acquires information from a lens.SOLUTION: An interchangeable lens disclosed herein is removably attachable to a camera body and comprises a storage unit for storing optical information based on aberrations thereof, and an acquisition unit configured to acquire from the camera body a body-side identifier derived by the camera body on the basis of the optical information.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an interchangeable lens and a determination method.

  2. Description of the Related Art A camera body that acquires unique information from a mounted interchangeable lens and performs control appropriate for the mounted interchangeable lens using the information is known (see Patent Document 1). In the prior art, the processing load on the camera body was increased.

JP-A-4-280239

An interchangeable lens according to a first aspect of the present invention is an interchangeable lens that can be attached to and detached from a camera body, wherein a storage unit that stores optical information based on aberration of the interchangeable lens, and the camera body based on the optical information An acquisition unit for acquiring the body-side identifier calculated by the camera body from the camera body.
A determination method according to a second aspect of the present invention is a determination method for an interchangeable lens that is detachable from a camera body, wherein the body-side identifier calculated by the camera body based on optical information based on aberration of the interchangeable lens is used. The method includes determining whether the lens-side identifier obtained from the camera body and calculated based on the optical information matches the body-side identifier.

It is a perspective view which illustrates a camera system. FIG. 2 is a block diagram illustrating a main configuration of the camera in FIG. 1. FIG. 6 is a diagram illustrating an example of distortion aberration data. 4A is a diagram illustrating a subject, FIG. 4B is a diagram illustrating barrel distortion by the imaging optical system, and FIG. 4C is a diagram illustrating pincushion distortion by the imaging optical system. FIG. 4 is a diagram illustrating an area where a correction coefficient is stored in a body-side control unit. 9 is a flowchart illustrating a process for determining a correction coefficient used in the correction process. 9 is a flowchart illustrating a process for determining a correction coefficient used in the correction process.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.
FIG. 1 is a perspective view illustrating a digital camera system 1 (hereinafter, referred to as a camera 1) including a camera body 2 and an interchangeable lens 3 according to an embodiment of the present invention.
FIG. 1 illustrates a camera system that is not a single-lens reflex camera, but the camera 1 may be a mirrorless camera system or a single-lens reflex camera system.

  In FIG. 1, the camera body 2 is provided with a body-side mount 210 formed in an annular shape. The detachable interchangeable lens 3 is attached to a body-side mount 210 of the camera body 2. The interchangeable lens 3 is provided with a lens-side mount 310 formed in an annular shape. When the interchangeable lens 3 is mounted on the camera body 2, the body-side mount 210 and the lens-side mount 310 are fitted.

<Interchangeable lens>
FIG. 2 is a block diagram illustrating a main configuration of the camera 1 of FIG. The interchangeable lens 3 includes a lens-side mount 310, a lens-side terminal holding unit 320, a lens-side control unit 330, a lens-side communication unit 340, a lens-side storage unit 350, an imaging optical system 360, a lens driving unit 370a, a lens driving unit 370b, And an aperture driving unit 380.

  The lens-side mount 310 is provided with a lens-side terminal holding section 320. The lens-side terminal holding section 320 has a plurality of lens-side terminals. The plurality of lens-side terminals include, for example, an attachment detection terminal that transmits a signal indicating that the interchangeable lens 3 is attached to the camera body 2 to the camera body 2, and is used for communication between the interchangeable lens 3 and the camera body 2. It includes a communication terminal, a power supply terminal for supplying power from the camera body 2 to the interchangeable lens 3, and a ground terminal.

The lens-side control unit 330 includes a microcomputer and its peripheral circuits. The lens-side control unit 330 controls each unit of the interchangeable lens 3 by executing a control program stored in the lens-side storage unit 350. Further, the lens-side control unit 330 reads out data stored in the lens-side storage unit 350 and transmits the data from the lens-side communication unit 340 to the camera body 2 in response to a request from the camera body 2.
The lens-side control unit 330 is connected to the lens-side communication unit 340, the lens-side storage unit 350, the lens driving unit 370a, the lens driving unit 370b, and the aperture driving unit 380.

  The lens-side communication unit 340 performs a predetermined communication with the body-side communication unit 240 of the camera body 2. The lens-side communication unit 340 is connected to the lens-side control unit 330 and the above-described communication terminal. By communication performed between the lens-side communication unit 340 and the body-side communication unit 240, an instruction to move an imaging optical system 360, which will be described later, and a request for data stored in the lens-side storage unit 350 are transmitted to the camera body. 2 to the interchangeable lens 3. On the other hand, information indicating the position of the imaging optical system 360 after the movement, data read from the lens-side storage unit 350, and the like are transmitted from the interchangeable lens 3 to the camera body 2.

  The lens-side storage unit 350 is configured by a non-volatile storage medium. Recording and reading of data in the lens side storage unit 350 are controlled by the lens side control unit 330. The lens-side storage unit 350 stores data (also referred to as model name information) indicating the model name of the interchangeable lens 3 and optical information of the imaging optical system 360 (in addition to storing a control program and the like executed by the lens-side control unit 330). For example, it is possible to store a numerical value table indicating optical characteristics, a coefficient of an equation for calculating the optical characteristics, and the like, and an identifier (referred to as lens-side data ID) for identifying optical information. The lens-side storage unit 350 is connected to the lens-side control unit 330.

An example of the optical characteristic is a distortion as shown in FIG. In FIG. 3, the horizontal axis is the image height ratio r (the ratio of each image height to the maximum image height), and the vertical axis is the distortion amount D. The curve shown by the solid line in FIG. 3 represents the amount of distortion D when the imaging optical system 360 is at a certain focal length. This distortion amount D can be expressed by the following equation (1) when approximated by a function of the image height ratio r.
D = Ar4 + Br3 + Cr2 (1)
In the above equation (1), A, B, and C are distortion coefficients as correction coefficients. When the focal length or the shooting distance changes, the amount of distortion changes, for example, as shown by the dotted line in FIG. 3, and the combination of the distortion coefficients A, B, and C also changes. Expression (1) may be a higher-order function. In that case, the correction coefficient also increases.
Here, the optical information on the distortion may be the table itself for the focal length and the photographing distance of the distortion amount D, or the distortion coefficients A, B, and C of Expression (1) representing the distortion amount D. In the following description, the optical information will be described using coefficients of equations representing distortion and other aberrations (hereinafter, referred to as “correction coefficients”), but is not limited thereto.

  In the present embodiment, by performing simulation using design data of the imaging optical system 360 or measuring the manufactured imaging optical system 360, the distortion coefficients A, B, and The data of C is acquired, and is used as optical information.

As another example of the optical information, a correction coefficient used in image processing for reducing the influence of aberration of the imaging optical system 360 or image processing reflecting an image effect desired by the user may be used. The correction coefficient includes, for example, a distortion correction coefficient (referred to as a first correction coefficient) for correcting distortion caused by the imaging optical system 360, and a CCI (Color Contribution) for correcting color shift (color) due to the spectral characteristics of the imaging optical system 360. Index) correction coefficient (referred to as a second correction coefficient), a correction coefficient (referred to as a third correction coefficient) for correcting chromatic aberration of magnification by the imaging optical system 360, and a decrease in light amount (vignetting) in the periphery caused by the imaging optical system 360. A correction coefficient to be corrected (referred to as a fourth correction coefficient) is included.
The correction coefficient may include a plurality of values according to the focal length and the photographing distance of the imaging optical system 360, and may include a plurality of values for each color (light frequency). A plurality of values may be included according to (aperture value).

In the present embodiment, the lens-side data ID is stored in the lens-side storage unit 350 as a lens-side identifier for identifying optical information. The storage locations of the optical information and the lens-side data ID need not necessarily be stored in the same storage unit, and may be stored in different storage units.
In the present embodiment, the lens-side data ID calculated by adding a part of the correction coefficients is used as the lens-side identifier, but the lens-side identifier is not limited to this. The lens-side identifier preferably has a smaller data amount than the optical information, is preferably calculated based on the optical information, and is more preferably calculated easily based on the optical information.
The lens-side data ID may store the value calculated by the lens-side control unit 330 from the optical information, or may store the value calculated by the external device from the optical information at the time of manufacture or maintenance of the interchangeable lens 3. You may.
If the influence of the optical characteristics of the imaging optical system 360 falls within a predetermined range and there is no need for correction, “0” may be stored as a correction coefficient.

  The lens-side data ID is, for example, a value obtained by adding only the first correction coefficient, a value obtained by adding the first correction coefficient and the second correction coefficient, and all of the first to fourth correction coefficients. May be adopted. Alternatively, a value obtained by adding all but not a part of the correction coefficients may be adopted.

  Generally, the optical characteristics of the imaging optical system 360 are slightly different one by one even if the interchangeable lens 3 is of the same model, so that when the image affected by the optical characteristics of the imaging optical system 360 is strictly corrected, The correction coefficients also differ one by one. Therefore, the lens-side data ID calculated based on the correction coefficient also has a different value for each lens. In the present embodiment, since the lens-side data ID is calculated from the correction coefficient, a different correction coefficient can be given to each of the interchangeable lenses 3 of the same model, and can be managed with different lens-side data IDs.

  The imaging optical system 360 guides subject light to the imaging surface of the imaging element 260 of the camera body 2. The optical axis O of the imaging optical system 360 coincides with the center position of the lens-side mount 310 and the body-side mount 210. The imaging optical system 360 in FIG. 2 includes, for example, a lens group including a focusing lens 361a and a zoom lens 361b, and an aperture 362. The focusing lens 361a is configured to be able to move forward and backward in the direction of the optical axis O by a lens driving unit 370a or a manual operation. The zoom lens 361b is configured to be able to advance and retreat in the direction of the optical axis O by a lens driving unit 370b or a manual operation. The position of each lens is configured to be detectable by an encoder or the like of the lens driving units 370a and 370b.

  The aperture 362 adjusts the amount of light incident on the image sensor 260. The aperture diameter (aperture value) can be changed by an aperture driving unit 380 or a manual operation. The aperture diameter of the aperture 362 is configured to be detectable by an encoder or the like of the aperture drive unit 380.

<Camera body>
The camera body 2 includes a body-side mount 210, a body-side terminal holding unit 220, a body-side control unit 230, a body-side communication unit 240, a power supply unit 250, an image sensor 260, an image processing unit 270, an operation member 280, and a display unit 290. Having.

  The body-side mount 210 is provided with a body-side terminal holder 220. The body-side terminal holding section 220 has a plurality of body-side terminals. The plurality of body-side terminals include, for example, a mounting detection terminal for transmitting a signal indicating that the interchangeable lens 3 is mounted to the camera body 2, and a communication terminal used for communication between the camera body 2 and the interchangeable lens 3. And a power supply terminal for supplying power from the camera body 2 to the interchangeable lens 3 and a grounding terminal. When the interchangeable lens 3 is mounted on the camera body 2, each of the plurality of body-side terminals described above physically contacts a corresponding one of the plurality of lens-side terminals. Due to this contact, the plurality of body-side terminals and the plurality of lens-side terminals are electrically connected to conduct.

  The body-side control unit 230 includes a microcomputer and its peripheral circuits. The body-side control unit 230 executes a control program stored in the storage unit 232 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 image processing unit 270, the operation member 280, the display unit 290, and the above-described attachment detection terminal.

The body-side control unit 230 includes a temporary storage unit 231 for temporarily storing data while power is supplied from the power supply unit 250, and a non-volatile memory for storing stored data even when power is not supplied from the power supply unit 250. And a storage unit 232. Data recording and reading of both the temporary storage unit 231 and the storage unit 232 are controlled by the body-side control unit 230.
The temporary storage unit 231 is used as a work memory when the body-side control unit 230 executes the control program. The temporary storage unit 231 can be used, for example, as a memory for temporarily storing data before being stored in the storage unit 232.
The storage unit 232 stores data indicating the optical information of the interchangeable lens 3 described above, a body-side data ID for identifying the data, and the like, in addition to storing a control program executed by the body-side control unit 230 and the like. be able to. The body-side data ID stored in the storage unit 232 is created based on the same rule as the lens-side data ID stored in the interchangeable lens 3. In the present embodiment, the data calculated on the interchangeable lens 3 side is referred to as a lens-side data ID, and the data calculated on the camera body 2 side is referred to as a body-side data ID, and the lens-side data ID and the body-side data ID are combined. ID. The correction coefficient stored in the storage unit 232 is transmitted from the interchangeable lens 3 to the camera body 2 at the request of the camera body 2. When transmitting and receiving the correction coefficient from the interchangeable lens 3 to the camera body 2 in a plurality of times, the data ID may be calculated using the correction coefficient transmitted and received in the first or first few times. In this case, it is preferable that the calculation of the body-side data ID can be started in the camera body 2 without waiting for all of the transmission and reception of the plurality of times to be completed.

The body-side communication unit 240 performs the above-described communication with the lens-side communication unit 340 of the interchangeable lens 3. The body-side communication unit 240 is connected to the body-side control unit 230 and the above-described communication terminal.
The power supply unit 250 converts a voltage of a battery (not shown) into a voltage used in each unit of the camera 1 and supplies the voltage to each unit of the camera body 2 and the interchangeable lens 3 (also referred to as power supply). The power supply unit 250 can switch on and off the power supply 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 above-described power supply terminal.

  The image sensor 260 is a solid-state image sensor such as a CMOS image sensor or a CCD image sensor. The imaging element 260 captures a subject image on the imaging surface according to a control signal from the body-side control unit 230 and outputs an imaging signal. The imaging element 260 is connected to the body-side control unit 230 and the image processing unit 270.

The operation member 280 is provided on an exterior surface of the camera body 2. The operation member 280 sends an operation signal corresponding to the operation to the body-side control unit 230. The operation member 280 is connected to the body-side control unit 230.
The display unit 290 is configured by, for example, a liquid crystal display panel. The display unit 290 displays an image based on the image data processed by the image processing unit 270, an operation menu screen, and the like in accordance with an instruction from the body-side control unit 230. Display unit 290 is connected to body-side control unit 230 and image processing unit 270.

  The image processing unit 270 performs predetermined image processing on the image pickup signal output from the image sensor 260 to generate image data. The generated image data is recorded in a storage medium (not shown) in a predetermined file format or used for image display by the display unit 290. As described above, the image processing includes image processing for reducing the influence of aberration, image processing for reflecting the image effect desired by the user, and the like. An example of the correction processing will be described later in detail. The image processing unit 270 is connected to the body-side control unit 230, the image sensor 260, and the display unit 290.

<Correction processing>
Of the image processing performed by the image processing unit 270, image processing for reducing the influence of aberration will be briefly described. As an example of image processing, a correction process using the above-described first correction coefficient, that is, a distortion correction process of correcting distortion by the imaging optical system 360 will be described with reference to FIG.

  FIG. 4A is a diagram illustrating a subject. FIG. 4B is a diagram exaggeratingly illustrating barrel distortion caused by the imaging optical system 360. FIG. 4C is a diagram exaggeratingly illustrating the pincushion type distortion caused by the imaging optical system 360. Generally, when the camera 1 captures an image of a grid-like subject, it is desirable that the image shown in FIG. However, depending on the optical characteristics of the imaging optical system 360 provided in the interchangeable lens 3, an image affected by the barrel distortion in FIG. 4B or the pincushion distortion in FIG. 4C may be obtained.

  In the present embodiment, the optical characteristics of the imaging optical system 360 that causes distortion as shown in FIGS. 4B and 4C are obtained by performing the above-described simulation or measurement in advance, and based on the obtained optical characteristics. Thus, the above-described first correction coefficient is prepared.

  The image processing unit 270 performs a correction process using the first correction coefficient on the data read from each pixel of the image sensor 260 by, for example, a method described in International Publication No. WO2007 / 66459. With this configuration, when the barrel distortion shown in FIG. 4B occurs, the distortion is corrected so as to suppress the barrel bulge, and an image as shown in FIG. 4A is obtained. . Further, when the pincushion-type distortion shown in FIG. 4C occurs, distortion correction is performed so as to suppress the pincushion-type dent, and an image as shown in FIG. 4A is obtained.

  The image processing unit 270 performs a correction process according to each of the above-described second correction coefficient, third correction coefficient, and fourth correction coefficient.

<Acquisition of correction coefficient>
A first group of interchangeable lenses including the interchangeable lens 3 of the present embodiment and a second group of interchangeable lenses not including the interchangeable lens 3 of the present embodiment can be mounted on the camera body 2. The first group and the second group differ in the method of acquiring the optical information of the interchangeable lens. The interchangeable lens 3 of the first group stores its own correction coefficient in the interchangeable lens 3. Further, the correction coefficient stored in the interchangeable lens 3 of the first group can be transmitted from the interchangeable lens 3 to the camera body 2 at least once. Therefore, the correction coefficient of the interchangeable lens 3 in the first group does not need to be stored in the camera body 2 before using the interchangeable lens 3. In addition, whether the correction coefficient has been correctly transmitted from the interchangeable lens 3 of the first group to the camera body 2 may be confirmed using a data ID having a smaller data amount than the correction coefficient. Further, the correction coefficients of the first group may be the same correction coefficient for each model, may be the same correction coefficient for each manufacturing lot, or may be different correction coefficients for each one. In addition, the correction coefficient of the first group may be obtained, for example, from the design value of the imaging optical system 360 of the interchangeable lens 3 belonging to the first group, or by measuring the optical characteristics of the manufactured imaging optical system 360. It may be calculated.
The second group is an interchangeable lens in which a correction coefficient as the same optical information is set for interchangeable lenses of the same model. The correction coefficient of the interchangeable lens of the second group is stored in advance in the camera body 2 to which the interchangeable lens of the second group can be mounted. In the interchangeable lens of the second group, since the correction coefficient is already stored in the camera body 2, there is no need to transmit the correction coefficient and the data ID from the interchangeable lens to the camera body 2.

  When the first group of interchangeable lenses 3 is mounted, the body-side control unit 230 performs the above-described correction processing using the correction coefficients acquired from the interchangeable lenses 3. Further, when the interchangeable lens of the second group is mounted, the body-side control unit 230 performs the above-described correction processing using the correction coefficient stored in the storage unit 232 of the body-side control unit 230.

  First, an area where the correction coefficient of the interchangeable lens 3 of the first group is stored in the body-side control unit 230 will be described with reference to FIG. The temporary storage unit 231 in FIG. 5 stores “lens data” for temporarily storing the first to fourth correction coefficients transmitted from the interchangeable lens 3 of the first group to the camera body 2. Area "is provided. Further, the temporary storage unit 231 stores the “body-side data ID of the body-side data ID” for temporarily storing the body-side data ID calculated by the body-side control unit 230 based on the correction coefficient stored in the “lens data area”. Area "is provided.

  The storage unit 232 in FIG. 5 includes an area 41 for storing information on the first group of interchangeable lenses 3 and an area 42 for storing information on the second group of interchangeable lenses 3. In the area 41, information on a plurality of interchangeable lenses 3 transmitted from the interchangeable lenses 3 belonging to the first group to the camera body 2 can be stored. In the present example, the first to fourth correction coefficients (referred to as correction coefficients for the first group) obtained from the eight interchangeable lenses 3 from the first lens to the eighth lens are respectively “ The first lens data area to the eighth lens data area are stored.

The area 41 includes body-side data calculated by the body-side control unit 230 based on the correction coefficient stored in the “first lens data area” to the correction coefficient stored in the “eighth lens data area”. The IDs are respectively stored in “area of body-side data ID of first lens” to “area of body-side data ID of eighth lens”. The correction coefficient stored in the data area of each lens and the body-side data ID stored in the area of the body-side data ID of each lens are associated by the body-side control unit 230.
The correction coefficient for the first group that can be stored in the area 41 is not limited to eight interchangeable lenses 3 but may be, for example, several tens.

  When the correction coefficient for the first group is transmitted from the interchangeable lens 3 of the first group, the body-side control section 230 stores the correction coefficient for the first group in the “lens data area” of the temporary storage section 231. "Is stored. The body-side control unit 230 further calculates a body-side data ID based on the correction coefficient stored in the “lens data area”, and stores the calculated body-side data ID in the “body-side data ID area” of the temporary storage unit 231. To memorize.

  The body-side control unit 230 moves the correction coefficient for the first group and the body-side data ID stored in the temporary storage unit 231 to the storage unit 232, for example, at a timing when the power-off process of the camera 1 is performed. That is, the first to fourth correction coefficients stored in the “lens data area” of the temporary storage unit 231 are stored in the “first lens data area” to the “eighth lens data area” of the storage unit 232. The body-side data ID stored in the “body-side data ID area” of the temporary storage unit 231 and the body-side data ID area of the first lens in the storage unit 41 "To the body-side data ID area of the eighth lens. The correction coefficient stored in the data area and the body-side data ID stored in the body-side data ID area are associated by the body-side control unit 230.

If there is no vacant data area among the “data area of the first lens” to the “data area of the eighth lens”, the body-side control unit 230 sets the “data area of the first lens” to “ Based on the reference history of the "data area of the eighth lens", for example, the data area in which the date and time when the correction coefficient was used is overwritten and stored.
Note that the data area to be overwritten may not be determined based on the use date and time, and the data area to be overwritten may be determined based on an infrequently used data area or a user setting.

  In the area 42, information on a plurality of interchangeable lenses belonging to the second group can be stored. The information of the area 42 is stored, for example, at the time of manufacturing or maintenance of the camera body 2. In this example, the optical information of a plurality of interchangeable lenses such as the A lens and the B lens is stored in the “data area of the A lens”, the “data area of the B lens”, and the like.

In the area 42, model name information is stored in association with the optical information stored in the data area of each lens. The correction coefficient for the second group may be the same as or different from the correction coefficient of the interchangeable lens 3 belonging to the first group.
There is no limitation on the number of models of the correction coefficient for the second group that can be stored in the area 42. However, in order to reduce the storage capacity of the camera body 2, the number of models is limited, and the correction coefficient is simplified (for example, the first (For example, limiting to a type of aberration smaller than the correction coefficient of the group). The correction coefficient stored in the area 42 can be updated or overwritten by uploading firmware corresponding to an interchangeable lens sold after the camera body 2 is sold.

As described above, in the interchangeable lens 3 of the first group, since the correction coefficient not stored in the camera body 2 is transmitted from the interchangeable lens 3 to the camera body 2, it is determined whether the correction coefficient has been transmitted correctly. Preferably, confirmation is performed. Therefore, after the correction coefficient is transmitted from the interchangeable lens 3 to the camera body 2, whether or not the correction coefficient received by the camera body 2 is usable (transmission was correctly performed) (transmission was not performed correctly) It is preferable to use a data ID having a smaller capacity than the data amount of all the correction coefficients in order to judge the above. Further, it is preferable that the interchangeable lens 3 determines whether the correction coefficient stored in the camera body 2 is usable or not, because the processing load on the camera body 2 can be reduced. Further, when making the determination with the interchangeable lens 3, it is preferable that the data amount of the data ID is small because the communication load can be reduced.
On the other hand, in the interchangeable lens 3 of the second group, the correction coefficient is not transmitted from the interchangeable lens 3 to the camera body 2, and the data ID is not transmitted from the camera body 2 to the interchangeable lens 3.

<Explanation of flowchart>
A process in which the body-side control unit 230 of the camera body 2 determines a correction coefficient used in the correction process of the image processing unit 270 will be described with reference to flowcharts of FIGS. The chart on the left side of FIG. 6 and FIG. 7 show the flow of processing executed by the body-side control unit 230. The chart on the right side of FIG. 6 illustrates the flow of processing executed by the lens-side control unit 330 of the interchangeable lens 3 of the first group.

<Camera body side>
When the communication with the attached interchangeable lens 3 is established, the body-side control section 230 starts the processing shown in FIG. In step S110 in FIG. 6, the body-side control unit 230 causes the body-side communication unit 240 to transmit a request for model name information to the interchangeable lens 3, and proceeds to step S120.

In step S120, the body-side control unit 230 determines that the attached lens is the first group of the interchangeable lens 3 or the second group of the interchangeable lens according to the model name information transmitted from the interchangeable lens. Is determined. When the model name information indicates that the interchangeable lens 3 is in the first group, the body-side control section 230 makes an affirmative decision in step S120 and proceeds to step S130. When the model name information indicates that the interchangeable lens belongs to the second group, the body-side control section 230 makes a negative determination in step S120, and proceeds to step S220.
The process of S130 may be performed after the start of the shooting operation. If it takes time to transmit and receive the correction coefficient after the start of the photographing operation and determine whether or not the correction coefficient can be used, the photographing timing may be missed. Therefore, it is preferable to transmit and receive the body-side data ID after the start of the photographing operation to finish the determination early, and to transmit a correction coefficient in advance when there is a time after the start-up or the like. Further, the determination whether the attached interchangeable lens is the first group or the second group may be performed based on the model name, or may be determined based on other information.

When the interchangeable lens of the second group is mounted, the body-side control unit 230 selects the corresponding model name from among the correction coefficients for the second group stored in the area 42 of the storage unit 232 in step S220. The use of the correction coefficient is determined, and the processing according to FIG. 6 ends.
The image processing unit 270 of the camera body 2 performs a correction process by appropriately referring to the correction coefficient of the model name determined in step S220.

When the interchangeable lens of the first group is attached, the body-side control unit 230 transmits all the body-side data IDs stored in the area 41 of the storage unit 232 from the body-side communication unit 240 in step S130. The data is transmitted to the interchangeable lens 3, and the process proceeds to step S140. Since the body-side data ID of the present embodiment is obtained by adding a part of the correction coefficients, the data amount is smaller than the data amount of all the correction coefficients. Therefore, for example, all body-side data IDs can be transmitted by one data transmission / reception.
Note that the transmission in step S130 may be performed in a plurality of times such as two times. Even when there is no body-side data ID stored in the area 41 of the storage unit 232, the body-side control unit 230 sets a predetermined value for the number that can be stored and exchanges it from the body-side communication unit 240. It may be transmitted to the lens 3. In that case, the data length of one data transmission / reception can be fixed, which is preferable.

  In step S140, the body-side control unit 230 receives the information indicating whether or not it can be used transmitted from the interchangeable lens 3 by the body-side communication unit 240, and proceeds to step S150. The information indicating whether or not use is possible includes the same data as the lens-side data ID stored in the lens-side storage unit 350 of the interchangeable lens 3 in the body-side data ID stored in the area 41 of the storage unit 232. This is the result of the determination by the lens-side control unit 330 of the interchangeable lens 3 as to whether or not the lens has been moved. If the body-side data ID for the first group stored in the area 41 of the storage unit 232 matches the lens-side data ID stored in the lens-side storage unit 350 of the interchangeable lens 3, the exchange is performed. The correction coefficient is correctly transmitted from the lens 3 to the camera body 2, and the correction coefficient stored in the interchangeable lens 3 is the same as the correction coefficient stored in the camera body 2. Available correction factors can be used.

  In the present embodiment, any one of “1”, “2”,..., “8”, and “no corresponding data” is transmitted from the interchangeable lens 3 as information indicating whether or not step S140 is usable. “1” indicates that the body-side data ID associated with the data area of the first lens in the area 41 of the storage unit 232 matches the lens-side data ID stored in the lens-side storage unit 350 of the interchangeable lens 3. It indicates that. “2” indicates that the body-side data ID associated with the data area of the second lens in the area 41 of the storage unit 232 matches the lens-side data ID stored in the lens-side storage unit 350 of the interchangeable lens 3. It indicates that. The same applies to “3” to “8”.

“No applicable data” indicates that any of the eight body-side data IDs associated with the data areas of the first to eighth lenses in the area 41 of the storage unit 232 is stored in the lens-side storage unit 350 of the interchangeable lens 3. That it does not match the stored lens-side data ID, in other words, the correction coefficient stored in the area 41 of the storage unit 232 is different from the correction coefficient stored in the lens-side storage unit 350 of the interchangeable lens 3. It indicates that.
By transmitting any of “1” to “8” and “no corresponding data” as information indicating whether or not the data can be used, all the body-side data IDs stored from the camera body 2 to the interchangeable lens 3 are transmitted. As a result, it is possible to make a determination with the interchangeable lens 3. Therefore, for example, compared with the case where the stored plurality of body-side data IDs are transmitted one by one to the interchangeable lens 3 and the determination result is received from the interchangeable lens 3 each time, the interchangeable lens 3 is transmitted to the camera body 2. It is possible to shorten the time required for determination by suppressing the number of times to perform the determination.

  In step S <b> 150, the body-side control section 230 determines whether or not the first group correction coefficient stored in the area 41 of the storage section 232 can be used in the correction processing of the image processing section 270. When receiving any of “1” to “8” in step S140, body-side control section 230 makes an affirmative decision in step S150, and proceeds to step S230. In step S230, the body-side control unit 230 corresponds to any of “1” to “8” received in step S140 among the correction coefficients for the first group stored in the area 41 of the storage unit 232. It is determined that the correction coefficient to be used is to be used, and the processing in FIG. 6 ends. From the correction coefficient for the first group determined in step S230, the image processing unit 270 of the camera body 2 determines the position of the lens constituting the imaging optical system 360 in the optical axis O direction and the aperture diameter of the stop 362 (the stop). The correction process is performed by appropriately referring to a required value according to the value (value).

On the other hand, when the body-side control unit 230 receives “No corresponding data” in step S140, it makes a negative determination in step S150 and proceeds to step S160. When a negative determination is made in step S150, for example, the case where the interchangeable lens 3 is attached for the first time after the purchase of the camera body 2, the case where the interchangeable lens 3 is attached to the camera body 2 for the first time after the purchase, the ninth first lens There is a case where the interchangeable lens 3 of the group is mounted.
In step S160, the body-side control section 230 causes the body-side communication section 240 to transmit a request for transmission of the correction coefficient stored in the lens-side storage section 350 to the interchangeable lens 3, and then proceeds to step S170.

  In step S170, the body-side control unit 230 receives the correction coefficient transmitted from the interchangeable lens 3 by the body-side communication unit 240, and proceeds to step S180 in FIG. The body-side control unit 230 stores the correction coefficient received from the interchangeable lens 3 in the “lens data area” of the temporary storage unit 231.

  In step S180 of FIG. 7, the body-side control unit 230 calculates the body-side data ID based on the correction coefficient received from the interchangeable lens 3, and proceeds to step S190. The body-side control unit 230 stores the calculated body-side data ID in the “body-side data ID area” of the temporary storage unit 231.

In step S190, the body-side control unit 230 causes the body-side data ID stored in the temporary storage unit 231 to be transmitted from the body-side communication unit 240 to the interchangeable lens 3, and then proceeds to step S200. In step S190, the body-side control unit 230 may transmit only the body-side data ID stored in the temporary storage unit 231 and firstly stores the body-side data ID stored in the temporary storage unit 231 in the storage unit 232. After that, all body-side data IDs stored in the storage unit 232 may be transmitted as in the case of step S130. In step S200, the body-side control unit 230 receives the information indicating whether or not it can be used transmitted from the interchangeable lens 3 by the body-side communication unit 240, and proceeds to step S210.
As in the case of step S140, the information indicating whether or not the use is possible is performed by determining whether the transmitted body-side data ID is the same as the lens-side data ID stored in the lens-side storage unit 350 of the interchangeable lens 3 or not. This is the result determined by the lens-side control unit 330 of FIG. In step S200, the body-side control unit 230 receives a determination result as to whether only the body-side data ID stored in the temporary storage unit 231 matches the lens-side data ID stored in the interchangeable lens 3. The determination result may be received as to whether or not there is any body-side data ID stored in the area 41 of the storage unit 232 that matches the lens-side data ID stored in the interchangeable lens 3. You may.

  In step S210, the body-side control unit 230 determines whether the correction coefficient stored in the area 41 of the temporary storage unit 231 or the storage unit 232 can be used in the correction processing of the image processing unit 270. If the body-side control unit 230 receives the result of the determination that the body-side data ID and the lens-side data ID match in step S200, it makes an affirmative determination in step S210 and proceeds to step S240. The body-side control unit 230 determines to use the lens correction coefficient corresponding to the body-side data ID determined to match in step S240, and ends the processing in FIG. The image processing unit 270 of the camera body 2 needs the correction coefficient determined in step S240 according to the position of the lens constituting the imaging optical system 360 in the optical axis O direction and the aperture diameter (aperture value) of the diaphragm 362. Correction processing is performed with reference to appropriate values.

On the other hand, when the body-side control unit 230 receives the determination result that the body-side data ID and the lens-side data ID do not match in step S200, a negative determination is made in step S210, and the process proceeds to step S250. When a negative determination is made in step S210, the correction coefficient received in step S170 may include an inappropriate value due to, for example, a communication error. Therefore, the body-side control unit 230 performs a predetermined error process in step S250, and ends the process in FIG.
In the error processing, for example, a message may be displayed on the display unit 290 to urge the user to clean the body-side terminal and the lens-side terminal.

<Interchangeable lens side>
When communication with the mounted camera body 2 is established, the lens-side control unit 330 starts the processing shown in FIG. In step S310 in FIG. 6, the lens-side control unit 330 receives a request for model name information from the camera body 2, and proceeds to step S320.

  In step S320, the lens-side control section 330 causes the lens-side communication section 340 to transmit the model name information stored in the lens-side storage section 350 to the camera body 2, and proceeds to step S330. In step S330, the lens-side controller 330 determines whether or not the body-side data ID has been received from the camera body 2. When the body-side data ID from the camera body 2 is received by the lens-side communication unit 340, the lens-side control unit 330 makes an affirmative determination in step S330 and proceeds to step S340. If the body-side data ID from the camera body 2 is not received by the lens-side communication unit 340, the lens-side control unit 330 makes a negative determination in step S330 and proceeds to step S400.

  When the body-side data ID is not received from the camera body 2, the lens-side control unit 330 performs a timeout determination in step S400. If the time to wait for reception exceeds the predetermined time, the lens-side control section 330 makes an affirmative determination in step S400 and ends the processing in FIG. If the time to wait for reception is less than the predetermined time, the lens-side control unit 330 makes a negative determination in step S400 and returns to step S330.

  When the body-side data ID is received from the camera body 2, the lens-side control unit 330 performs a matching process in step S340. In the matching process, all the body-side data IDs transmitted from the camera body 2 include the same data ID as the lens-side data ID stored in the lens-side storage unit 350, in other words, the same data ID. This is a process for determining whether or not there is any. In steps S350 and S360, the lens-side control section 330 transmits the collation result to the camera body 2. In step S350, the lens-side control unit 330 transmits one of “1” to “8” indicating the body-side data ID that matches the lens-side data ID. In step S360, the lens-side control section 330 transmits "No corresponding data" indicating that there is no transmitted body-side data ID that matches the lens-side data ID.

  Here, if the interchangeable lens determined to be the first group in step S120 transmits any one of “1” to “8” as the matching result in step S350 without appropriately performing the matching process in step S340. The case in which it is performed will be described. As described above, the image processing unit 270 of the camera body 2 performs the correction process using the correction coefficient stored in the area 41 of the storage unit 232. At this time, among the correction coefficients stored in the area 41 of the storage unit 232, the information on the result of the verification transmitted from the interchangeable lens, that is, the correction coefficients corresponding to “1” to “8” are used for the correction processing. With such a configuration, if the collation processing in step S340 is not properly performed, a correction coefficient of another interchangeable lens 3 completely different from the optical characteristics of the mounted interchangeable lens is used for the correction processing. Will be. Therefore, for example, when an interchangeable lens having distortion as shown in FIG. 4B sends a collation result indicating that it matches the lens-side data ID of the pin-wound interchangeable lens 3 as the collation result, Correction processing to increase the swelling of the image. Therefore, by performing the collation using the data ID, it is possible to perform image processing according to the optical characteristics of each interchangeable lens.

  In the present embodiment, since the optical information includes the individual difference, the correction can be performed in consideration of the individual difference of each line. In other words, even with the interchangeable lenses 3 having the same model name, image processing using optical information in consideration of individual differences between individual lenses can be performed. In addition, the data amount of the optical information may be increased because the data includes the individual difference. However, it is possible to determine whether or not the optical information can be adopted with one simple identifier.

According to the above-described embodiment, the following operation and effect can be obtained.
(1) The interchangeable lens 3 that can be attached to and detached from the camera body is calculated by the lens-side storage unit 350 that stores optical information of the imaging optical system 360 and the camera body 2 (the body-side control unit 230) based on the optical information. A lens-side controller 330 for acquiring a body-side identifier from the camera body 2. With this configuration, the lens-side control unit 330 of the interchangeable lens 3 determines, for example, whether the same optical information as the optical information stored in the lens-side storage unit 350 exists on the camera body 2 side. You can also. Therefore, the processing load on the camera body 2 can be reduced as compared with the case where the above determination is made only on the camera body 2 side.

  The body-side identifier acquired from the camera body 2 may have a smaller data amount than the optical information, but is not limited thereto. By using the body-side identifier having a small data amount, the optical information itself is obtained from the camera body 2 and compared with the case where it is determined whether the optical information matches the optical information stored in the lens-side storage unit 350 in the interchangeable lens 3. Thus, the burden of communication processing between the camera body 2 and the interchangeable lens 3 and comparison processing in the interchangeable lens 3 can be reduced.

(2) The lens-side storage unit 350 of the interchangeable lens 3 stores the lens-side identifier calculated based on the optical information and the optical information. With this configuration, the lens-side identifier stored in the lens-side storage unit 350 can be read out without calculating the lens-side identifier each time the comparison process with the body-side identifier acquired from the camera body 2 is performed. For this reason, the processing load on the interchangeable lens 3 can be reduced.

(3) The lens-side controller 330 of the interchangeable lens 3 determines whether the body-side identifier obtained from the camera body 2 matches the lens-side identifier calculated based on the optical information. With this configuration, it is possible to appropriately determine whether or not the same optical information as the optical information stored in the lens-side storage unit 350 exists in the camera body 2.

(4) The interchangeable lens 3 includes a lens-side communication unit 340 that transmits optical information to the camera body 2. With this configuration, the optical information can be transmitted to the camera body 2 when the same optical information as the optical information stored in the lens-side storage unit 350 does not exist in the camera body 2.

(5) The lens-side transmitting section 340 transmits optical information to the camera body 2 when the lens-side control section 330 determines that the body-side identifier and the lens-side identifier do not match. With such a configuration, the opportunity of transmitting the optical information from the interchangeable lens 3 to the camera body 2 can be limited to a case where it is determined that the two do not match, and the burden of the communication processing can be reduced.

(6) The lens-side control unit 330 can acquire a plurality of body-side identifiers, and the lens-side control unit 330 determines whether any of the acquired body-side identifiers includes an identifier that matches the lens-side identifier. Determine whether or not. With this configuration, a plurality of stored body side identifiers can be confirmed by one data reception, rather than receiving and confirming the stored body side identifiers one by one. Therefore, the time required to confirm the body-side identifier can be reduced.

(7) The determination method performed by the interchangeable lens 3 that can be attached to and detached from the camera body 2 is such that the body-side identifier calculated by the camera body 2 based on the optical information of the interchangeable lens 3 is acquired from the camera body 2, and based on the optical information. It includes determining whether or not the calculated lens-side identifier matches the body-side identifier. According to this determination method, the above-described determination is performed by the interchangeable lens 3, so that the processing load on the camera body 2 can be reduced as compared with the case where the above-described determination is performed only by the camera body 2.

(8) The interchangeable lens 3 that can be attached to and detached from the camera body has an imaging optical system 360 that forms light from a subject and a lens-side identifier calculated by adding at least a part of optical information of the imaging optical system 360. A lens-side storage unit 350 that stores optical information. With this configuration, both the optical information of the imaging optical system 360 of the interchangeable lens 3 and the lens-side identifier used to identify the optical information can be stored in the lens-side storage unit 350. Further, the lens-side control unit 330 can determine whether or not the same optical information as the optical information stored in the lens-side storage unit 350 exists in the camera body 2 using the lens-side identifier. Therefore, it is necessary to calculate the lens-side identifier each time the interchangeable lens 3 performs a process using the lens-side identifier (in the present embodiment, whether or not the lens-side identifier matches the body-side identifier). In addition, the processing load on the interchangeable lens 3 can be reduced.

(9) The lens-side storage unit 350 stores optical information based on a plurality of aberrations. With such a configuration, for example, processing using optical information based on a plurality of aberrations (eg, image processing for correcting aberrations) can be performed.

(10) The lens-side storage unit 350 stores optical information based on aberration that varies according to at least one of a focal length, a shooting distance, and an image height. With this configuration, it is possible to increase the accuracy of processing using optical information.
Further, optical information based on the changing aberration may be managed by one identifier. In that case, even if the data amount of the optical information increases, it can be managed with one identifier.

(11) The lens-side storage unit 350 stores optical information according to the aberration of the imaging optical system 360 of the interchangeable lens 3. In general, individual differences occur in the imaging optical system. However, with such a configuration, it is possible to obtain optical information corresponding to aberration in consideration of individual differences of the imaging optical system 360 of the interchangeable lens 3.

(12) The data amount of the lens-side identifier is smaller than the data amount of the optical information. With such a configuration, the processing load of the collation processing using the lens-side identifier can be reduced as compared with the processing load of the collation processing using the optical information itself. Further, by transmitting and receiving an identifier having a small amount of data between the interchangeable lens 3 and the camera body 2, the burden of communication processing can be reduced.

(13) The interchangeable lens 3 includes a lens-side communication unit 340 that performs communication with the camera body 2. The lens-side communication unit 340 transmits the optical information to the camera body 2, and transmits the lens-side identifier to the camera. Do not send to body 2. With this configuration, it is possible to make the camera body 2 calculate the body-side identifier, and confirm whether the optical information is correctly transmitted and received.

(14) In the method of manufacturing the interchangeable lens 3 that is detachable from the camera body 2, an imaging optical system 360 that forms light from a subject is arranged, and at least a part of optical information based on aberration of the imaging optical system 360 is added. This includes storing the lens-side identifier and the optical information calculated together in the lens-side storage unit 350. With such a configuration, both the optical information of the imaging optical system 360 of the interchangeable lens 3 and the lens-side identifier used for identifying the optical information can be stored.

(15) The method of manufacturing the interchangeable lens 3 includes measuring optical information of the imaging optical system 360 and storing the lens-side identifier and the optical information in the lens-side storage unit 350 based on the measurement result. With such a configuration, it is possible to store optical information reflecting the aberration characteristic inherent in the imaging optical system 360.

(16) The camera body 2 to which the interchangeable lens 3 is detachable includes a body-side control unit 230 that acquires optical information based on aberration of the interchangeable lens 3 and a body-side identifier obtained by adding at least a part of the optical information. The storage unit 232 stores the optical information corresponding to the body-side identifier for each of the plurality of interchangeable lenses 3. With this configuration, it is possible to send the body-side identifier from the camera body 2 to the interchangeable lens 3 and determine whether the interchangeable lens 3 matches the body-side identifier and the lens-side identifier. Further, when the interchangeable lens 3 transmits the determination result to the camera body 2, the camera body 2 can specify the optical information corresponding to the body-side identifier determined to match. Further, the camera body 2 can also store optical information on a plurality of interchangeable lenses mounted in the past in association with the calculated body-side identifiers. That is, since a plurality of pieces of optical information can be stored in the camera body 2 in association with the body-side identifier, the optical information can be maintained even when the interchangeable lens is removed, and the same exchange There is no need to receive optical information again when the lens is mounted, and the number of times optical information is received from the interchangeable lens can be reduced.

(17) The camera body 2 includes a body-side communication unit 240 that transmits a plurality of body-side identifiers stored in the storage unit 232 to the interchangeable lens 3. With such a configuration, the camera body 2 can transmit a plurality of body-side identifiers to the interchangeable lens 3 with respect to a plurality of interchangeable lenses that have been mounted in the past, and can obtain a determination result.

(18) The body-side communication unit 240 transmits the plurality of body-side identifiers stored in the storage unit 232 to the interchangeable lens 3 in one data communication. With this configuration, even if a plurality of body-side identifiers are transmitted, the load on communication processing does not increase.

(19) The camera body 2 calculates a body-side identifier by adding at least a part of the obtained optical information by the body-side control unit 230. With this configuration, for example, even when interchangeable lenses of the same model have different optical information for each lens, the interchangeable lenses can be managed with different identifiers for each lens.

(20) If the camera body 2 determines that the body-side identifier stored in the storage unit 232 does not match the lens-side identifier stored in the attached interchangeable lens 3 by the body-side control unit 230, Requests optical information from the interchangeable lens 3. With this configuration, the transmission request of the optical information from the interchangeable lens 3 to the camera body 2 can be limited only to the case where it is determined that they do not match. Therefore, the load on the communication processing can be reduced.

(21) The camera body 2 is configured to associate the body-side identifier stored in the storage unit 232 with the body-side identifier determined to match the lens-side identifier stored in the attached interchangeable lens 3. An image processing unit 270 that performs image processing using information is provided. With such a configuration, it is possible to perform processing according to the aberration of the imaging optical system 360 of the mounted interchangeable lens 3.

(22) The storage unit 232 of the camera body 2 overwrites and stores the body-side identifier and the corresponding optical information based on at least one of the use date and time and the use frequency. With this configuration, it is possible to cope with the usage history of the user while suppressing the storage capacity of the storage unit 232 that stores the optical information corresponding to the body-side identifier.

(23) The determination method of the camera body 2 to which the interchangeable lens 3 can be attached and detached is to acquire optical information based on the aberration of the interchangeable lens 3 and associate a body-side identifier obtained by adding at least a part of the optical information with the optical information. A plurality of body-side identifiers stored in the storage unit 232 are transmitted to the interchangeable lens 3, and information on whether or not the lens-side identifier stored in the interchangeable lens 3 matches the body-side identifier is transmitted. Received from interchangeable lens 3. With this configuration, both the optical information of the interchangeable lens 3 and the body-side identifier used for identifying the optical information can be stored in the storage unit 232 in association with each other. Further, since the body-side identifier is calculated by adding at least a part of the optical information, even when the interchangeable lens 3 of the same model has different optical information for each lens, a different identifier for each lens is used. Can be managed. Further, since information on whether or not the lens-side identifier and the body-side identifier match with each other is received from the interchangeable lens 3, the camera body 2 does not need to judge whether or not the above-mentioned match exists. The processing load on the body 2 can be reduced.

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 timing of moving data from the temporary storage unit 231 to the storage unit 232 can be changed as appropriate. The camera body 2 includes, for example, the correction coefficient stored in the “lens data area” of the temporary storage unit 231 and the body side stored in the “body-side data ID area” when the power-off process of the camera 1 is performed. The data ID may be moved to the storage unit 232 in association with the data ID.

(Modification 2)
Generally, there is a type in which a teleconverter is built in the interchangeable lens 3. The interchangeable lens 3 having a built-in teleconverter is configured to be movable so that the teleconverter has a component orthogonal to the optical axis O. With such a configuration, it is possible to switch between a state where the teleconverter is inserted on the optical path and a state where the teleconverter is retracted outside the optical path. In a state where the teleconverter is inserted on the optical path (referred to as when the teleconverter is used), the focal length of the imaging optical system 360 is longer than a state where the teleconverter is retracted out of the optical path (referred to as not used). For example, 1.4 times). When using the teleconverter, the lens configuration of the imaging optical system 360 includes the lens of the teleconverter. On the other hand, when the teleconverter is not used, the lens of the teleconverter is not included in the lens configuration of the imaging optical system 360.

  As described above, since the focal length is different between when the teleconverter is used and when it is not used, the optical characteristics of the imaging optical system 360 are different between when the teleconverter is used and when it is not used. Therefore, a correction coefficient when the teleconverter is used and a correction coefficient when the teleconverter is not used are given to the interchangeable lens 3 having the built-in teleconverter. Therefore, the lens-side storage unit 350 stores two sets of correction coefficients and two sets of lens-side data IDs for one interchangeable lens with a built-in teleconverter. That is, the correction coefficient when the teleconverter is used and its lens-side data ID, and the correction coefficient when the teleconverter is not used and its lens-side data ID are stored.

  The lens-side control unit 330 of the interchangeable lens 3 of the type in which a teleconverter is built detects whether the teleconverter is used or not based on a sensor output (not shown). In the collation processing in step S340, the lens-side data ID when the teleconverter is used is used when the teleconverter is used, and the lens-side data ID when the teleconverter is not used when the teleconverter is not used. When transmitting the correction coefficient in step S380, the correction coefficient when using the teleconverter is transmitted when using the teleconverter, and the correction coefficient when not using the teleconverter is transmitted when not using the teleconverter.

According to the second modification, in the interchangeable lens 3 having a built-in teleconverter, the correction coefficient when the teleconverter is used and its lens-side data ID, and the correction coefficient when the teleconverter is not used and its lens-side data ID are stored in the lens-side storage unit. 350. Then, in the collation processing in step S340 and when transmitting the correction coefficient in step S380, the corresponding lens-side data ID or correction coefficient is used when the teleconverter is used and when it is not used. Since the camera body 2 is configured to be able to store a plurality of correction coefficients and body-side data IDs, it is not necessary to transmit the correction coefficients each time the use or non-use of the teleconverter is switched. Further, the interchangeable lens 3 having a built-in teleconverter can be used without changing the processing on the camera body 2 side.
Further, the camera body 2 receives the correction coefficient in step S170 and detects the use / non-use state of the teleconverter, or specifies the use / nonuse state of the teleconverter in step S160 and instructs the interchangeable lens 3 to transmit the correction coefficient. It may be performed.

DESCRIPTION OF SYMBOLS 1 ... Camera system, 2 ... Camera body, 3 ... Interchangeable lens, 210 ... Body side mount, 230 ... Body side control part, 231 ... Temporary storage part, 232 ... Storage part, 240 ... Body side communication part, 270 ... Image processing Unit, 310: lens side mount, 330: lens side control unit, 340: lens side communication unit, 350: lens side storage unit, 360: imaging optical system, 361a: focusing lens, 361b: zoom lens

Claims (7)

An interchangeable lens that can be attached to and detached from the camera body,
A storage unit in which optical information based on the aberration of the interchangeable lens is stored,
An acquisition unit for acquiring, from the camera body, a body-side identifier calculated by the camera body based on the optical information. The interchangeable lens according to claim 1,
The interchangeable lens that stores the lens-side identifier calculated based on the optical information and the optical information. The interchangeable lens according to claim 1 or 2,
An interchangeable lens including a determination unit configured to determine whether the body-side identifier acquired by the acquisition unit matches a lens-side identifier calculated based on the optical information. The interchangeable lens according to any one of claims 1 to 3,
An interchangeable lens including a transmission unit that transmits the optical information to the camera body. The interchangeable lens according to claim 4,
A determination unit configured to determine whether the body-side identifier acquired by the acquisition unit matches a lens-side identifier calculated based on the optical information,
An interchangeable lens that transmits the optical information to the camera body when the determination unit determines that the body-side identifier does not match the lens-side identifier. The interchangeable lens according to any one of claims 3 to 5,
The acquisition unit can acquire a plurality of the body-side identifiers,
An interchangeable lens that determines whether or not the plurality of body-side identifiers acquired by the acquiring unit include an identifier that matches the lens-side identifier. A determination method for an interchangeable lens that is detachable from a camera body,
Obtaining a body-side identifier calculated by the camera body based on optical information based on aberration of the interchangeable lens from the camera body,
A determining method including determining whether the lens-side identifier calculated based on the optical information matches the body-side identifier.

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