JP7205085B2 - Interchangeable lens and judgment method - Google Patents

Description

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

2. Description of the Related Art A camera body that acquires unique information from an attached interchangeable lens and uses the information to perform control suitable for the attached interchangeable lens is known (see Patent Document 1). In the conventional technology, the processing load on the camera body has increased.

JP-A-4-280239

An interchangeable lens according to a first aspect of the present invention is an interchangeable lens that is attachable to and detachable from a camera body, wherein optical information based on aberrations including individual differences of the interchangeable lens and numerical values of at least part of the optical information are added. a storage unit storing a lens-side identifier that is the result of the joint calculation; and a body-side identifier calculated by the camera body by adding together at least part of the numerical values of the optical information. and an obtaining unit for
A determination method according to a second aspect of the present invention is a determination method for an interchangeable lens that can be attached to and removed from a camera body, in which numerical values of at least a part of optical information based on aberrations including individual differences of the interchangeable lens are added together. obtaining the calculated body-side identifier from the camera body, and determining whether or not the lens-side identifier, which is a result calculated by adding numerical values of at least part of the optical information, matches the body-side identifier; including doing

1 is a perspective view illustrating a camera system; FIG. FIG. 2 is a block diagram for explaining the main configuration of the camera in FIG. 1; It is a figure which shows an example of distortion aberration data. FIG. 4(a) is a diagram showing a subject, FIG. 4(b) is a diagram illustrating barrel distortion due to the imaging optical system, and FIG. 4(c) is a diagram illustrating pincushion distortion due to the imaging optical system. FIG. 4 is a diagram for explaining areas in which correction coefficients are stored in a body-side control unit; FIG. 10 is a flowchart for explaining a process of determining correction coefficients used in correction processing; FIG. FIG. 10 is a flowchart for explaining a process of determining correction coefficients used in correction processing; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION 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 camera 1) composed of a camera body 2 and an interchangeable lens 3 according to one embodiment of the invention.
Although a non-single-lens reflex type camera system is exemplified in FIG. 1, the camera 1 may be a mirrorless type lens-interchangeable camera system or a single-lens reflex type lens-interchangeable camera system.

In FIG. 1, the camera body 2 is provided with a ring-shaped body-side mount 210 . A 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 attached to 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 for explaining the main configuration of the camera 1 of FIG. 1. As shown in FIG. The interchangeable lens 3 includes a lens side mount 310, a lens side terminal holding portion 320, a lens side control portion 330, a lens side communication portion 340, a lens side storage portion 350, an imaging optical system 360, a lens drive portion 370a, a lens drive portion 370b, and a diaphragm driver 380 .

A lens-side terminal holding portion 320 is provided on the lens-side mount 310 . The lens-side terminal holding portion 320 has a plurality of lens-side terminals. The plurality of lens-side terminals include, for example, an attachment detection terminal for transmitting a signal indicating that the interchangeable lens 3 is attached to the camera body 2 to the camera body 2, and an attachment detection terminal 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 grounding terminal.

The lens-side control section 330 is composed of a microcomputer, its peripheral circuits, and the like. The lens side control section 330 executes control programs stored in the lens side storage section 350 to control each section of the interchangeable lens 3 . In response to a request from the camera body 2 , the lens-side control section 330 reads data stored in the lens-side storage section 350 and transmits the data from the lens-side communication section 340 to the camera body 2 .
The lens side control section 330 is connected to the lens side communication section 340 , the lens side storage section 350 , the lens drive section 370 a , the lens drive section 370 b and the aperture drive section 380 .

The lens side communication section 340 performs predetermined communication with the body side communication section 240 of the camera body 2 . The lens-side communication section 340 is connected to the lens-side control section 330 and the communication terminal described above. Through communication between the lens-side communication unit 340 and the body-side communication unit 240, an instruction such as to move the imaging optical system 360, which will be described later, and a request for data stored in the lens-side storage unit 350 are sent 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 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. FIG.

The lens side storage unit 350 is configured by a nonvolatile storage medium. The lens-side storage unit 350 is controlled by the lens-side control unit 330 to record and read data. The lens-side storage unit 350 stores control programs and the like executed by the lens-side control unit 330, as well as data indicating the model name of the interchangeable lens 3 (also referred to as model name information) and optical information of the imaging optical system 360 ( For example, a table of numerical values indicating optical characteristics, coefficients of formulas for calculating optical characteristics, etc.), identifiers for identifying optical information (referred to as lens-side data IDs), and the like can be stored. The lens side storage section 350 is connected to the lens side control section 330 .

An example of optical characteristics is 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. In FIG. A curve indicated by a 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 photographing distance changes, the distortion amount changes, for example, as indicated by the dotted line in FIG. 3, and the combination of distortion coefficients A, B, and C also changes. Note that equation (1) may be a higher-order function. In that case, the correction factor is also increased.
Here, the optical information regarding the distortion aberration may be the table itself for the focal length and the object distance of the distortion amount D, or may be the distortion coefficients A, B, and C of the equation (1) representing the distortion amount D. FIG. In the following description, coefficients of equations representing distortion and other aberrations (hereinafter referred to as "correction coefficients") will be used as optical information, but this is not the only option.

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

Other examples of the optical information may be correction coefficients used in image processing that reduces the effects of aberrations of the imaging optical system 360 and image processing that reflects image effects desired by the user. The correction coefficients include, 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 polarization (color) due to 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 the chromatic aberration of magnification due to the imaging optical system 360, and the peripheral light amount reduction (vignetting) due to the imaging optical system 360. It contains a correction coefficient to be corrected (referred to as a fourth correction coefficient).
The correction coefficient may include a plurality of values according to the focal length and shooting distance of the imaging optical system 360, and may include a plurality of values for each color (light ray frequency). A plurality of values may be included according to (aperture value).

In this embodiment, lens side data ID is stored in 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 do not necessarily have to be stored in the same storage unit, and may be stored in different storage units.
In this embodiment, as the lens side identifier, the lens side data ID calculated by adding up part of the correction coefficients described above is used, but the lens side identifier is not limited to this. The lens-side identifier preferably has a smaller amount of data than the optical information, preferably is calculated based on the optical information, and more preferably easily calculated based on the optical information.
The lens-side data ID may store a value calculated from the optical information by the lens-side control unit 330, or may store a value calculated from the optical information by an external device during manufacture or maintenance of the interchangeable lens 3. may
If the influence of the optical characteristics of the imaging optical system 360 falls within a predetermined range and no correction is necessary, "0" may be stored as the 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 correction coefficient to the fourth correction coefficient. may be adopted. Alternatively, a value obtained by adding all of the correction coefficients instead of some of them may be adopted.

In general, the optical characteristics of the imaging optical system 360 are slightly different one by one even if the interchangeable lenses 3 are of the same model. The correction coefficients are also different one by one. Therefore, the lens-side data ID calculated based on the correction coefficient also has a different value for each lens. In this embodiment, since the lens-side data ID is calculated from the correction coefficient, it is possible to give different correction coefficients to the interchangeable lenses 3 of the same model and manage them 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 positions of the lens side mount 310 and the body side mount 210 . The imaging optical system 360 in FIG. 2 is composed of, for example, a lens group including a focusing lens 361a and a zoom lens 361b, and a diaphragm 362. As shown in FIG. The focusing lens 361a is configured to be movable back and forth in the direction of the optical axis O by the lens driving section 370a or manual operation. The zoom lens 361b is configured to be movable back and forth in the direction of the optical axis O by the lens driving section 370b or manual operation. The position of each lens is configured to be detectable by an encoder or the like of lens drive units 370a and 370b.

A diaphragm 362 adjusts the amount of light incident on the imaging device 260 . The aperture diameter (aperture value) can be changed by the aperture drive unit 380 or manual operation. The aperture diameter of the diaphragm 362 is configured to be detectable by an encoder or the like of the diaphragm driver 380 .

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

A body-side terminal holding portion 220 is provided on the body-side mount 210 . The body-side terminal holding portion 220 has a plurality of body-side terminals. The plurality of body-side terminals include, for example, an attachment detection terminal that transmits a signal indicating that the interchangeable lens 3 has been attached to the camera body 2, and a communication terminal that is used for communication between the camera body 2 and the interchangeable lens 3. , a power feeding terminal for supplying power from the camera body 2 to the interchangeable lens 3, and a grounding terminal. When the interchangeable lens 3 is attached to the camera body 2, each of the plurality of body-side terminals described above physically contacts the corresponding terminal of the plurality of lens-side terminals described above. Due to this contact, the plurality of body-side terminals and the plurality of lens-side terminals are electrically connected and conducted.

The body-side control section 230 is composed of a microcomputer, its peripheral circuits, and the like. The body-side control section 230 executes control programs stored in the storage section 232 to control each section within the camera body 2 . Body-side control section 230 is connected to body-side communication section 240, power supply section 250, imaging device 260, image processing section 270, operation member 280, display section 290, and the attachment detection terminal described above.

The body-side control unit 230 includes a temporary storage unit 231 that temporarily stores data while power is supplied from the power supply unit 250, and a non-volatile storage unit that retains stored data even when power is not supplied from the power supply unit 250. and a storage unit 232 of. Both the temporary storage unit 231 and the storage unit 232 are controlled by the body-side control unit 230 to record and read data.
Temporary storage unit 231 is used as a working memory when body-side control unit 230 executes a control program. The temporary storage unit 231 can also be used as a memory for temporarily storing data before being stored in the storage unit 232, for example.
The storage unit 232 stores, in addition to storing control programs and the like executed by the body-side control unit 230, data indicating the above-described optical information of the interchangeable lens 3, body-side data ID for identifying this data, and the like. be able to. The body side data ID stored in the storage unit 232 is created according to the same rule as the lens side data ID stored in the interchangeable lens 3 . In the present embodiment, data calculated on the interchangeable lens 3 side is defined as a lens side data ID, and data calculated on the camera body 2 side is defined as a body side data ID. ID. The correction coefficients stored in the storage unit 232 are those transmitted from the interchangeable lens 3 to the camera body 2 at the request of the camera body 2 . When the correction coefficients are transmitted and received from the interchangeable lens 3 to the camera body 2 in multiple times, the data ID may be calculated using the correction coefficients transmitted and received the first time or the first few times. In that case, it is preferable that the calculation of the body-side data ID can be started within the camera body 2 without waiting for the completion of all the transmissions and receptions performed a plurality of times.

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

The imaging device 260 is a solid-state imaging device such as a CMOS image sensor or a CCD image sensor. The image pickup device 260 picks up a subject image on the image pickup plane and outputs an image pickup signal according to a control signal from the body side control section 230 . The imaging device 260 is connected to the body side control section 230 and the image processing section 270 .

The operating member 280 is provided on the exterior surface of the camera body 2 . The operation member 280 sends an operation signal to the body-side control section 230 according to the operation. Operation member 280 is connected to body-side control section 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, etc., according to an instruction from the body-side control unit 230. FIG. 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 imaging signal output from the imaging device 260 to generate image data. The generated image data is recorded in a predetermined file format in a storage medium (not shown), or used for image display by the display unit 290 . As described above, image processing includes image processing that reduces the effects of aberrations, image processing that reflects image effects desired by the user, and the like. An example of correction processing will be described in detail later. Image processing section 270 is connected to body side control section 230 , imaging element 260 and display section 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, correction processing using the above-described first correction coefficient, that is, distortion correction processing for correcting distortion caused by the imaging optical system 360 will be described with reference to FIG.

FIG. 4A is a diagram showing a subject. FIG. 4B is a diagram exaggerating and exemplifying barrel distortion by the imaging optical system 360 . FIG. 4C is an exaggerated illustration of the pincushion distortion caused by the imaging optical system 360 . In general, when the camera 1 captures an image of a grid-like object, it is desirable to obtain an image shown in FIG. 4(a). However, depending on the optical characteristics of the imaging optical system 360 provided in the interchangeable lens 3, an image affected by barrel distortion in FIG. 4(b) or pincushion distortion in FIG. 4(c) may be obtained.

In the present embodiment, the optical characteristics of the imaging optical system 360 that cause distortions such as those shown in FIGS. , the above-mentioned first correction coefficient is prepared.

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

The image processing unit 270 also performs correction processing 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 attached to the camera body 2 . The first group and the second group use different methods of acquiring optical information of the interchangeable lens. The interchangeable lenses 3 of the first group store their own correction coefficients in the interchangeable lenses 3 . Also, the correction coefficients 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 coefficients of the first group of interchangeable lenses 3 do not have to be stored in advance in the camera body 2 before the interchangeable lenses 3 are used. Further, whether or not the correction coefficients have 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 data amount smaller than that of the correction coefficients. The correction coefficients in the first group may be the same correction coefficient for each model, the same correction coefficient for each production lot, or different correction coefficients for each product. Further, the correction coefficient of the first group may be obtained, for example, from the design values of the imaging optical system 360 of the interchangeable lens 3 belonging to the first group, and the optical characteristics of the manufactured imaging optical system 360 may be measured. can be calculated.
The second group is interchangeable lenses for which correction coefficients as the same optical information are set for interchangeable lenses of the same model. The correction coefficients of the second group of interchangeable lenses are stored in advance in the camera body 2 on which the second group of interchangeable lenses can be mounted. In the second group of interchangeable lenses, the correction coefficients are already stored in the camera body 2 , so there is no need to transmit the correction coefficients and data ID from the interchangeable lenses to the camera body 2 .

When the interchangeable lens 3 of the first group is attached, the body-side control section 230 uses the correction coefficient acquired from the interchangeable lens 3 to perform the correction process described above. Also, when the interchangeable lens of the second group is attached, the body-side control section 230 performs the correction process described above using the correction coefficients stored in the storage section 232 of the body-side control section 230 .

First, the area in which the correction coefficients of the first group of interchangeable lenses 3 are stored in the body-side control section 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 first group of interchangeable lenses 3 to the camera body 2. area” is provided. In the temporary storage unit 231, a "body-side data ID" for temporarily storing the body-side data ID calculated by the body-side control unit 230 based on the correction coefficients stored in the "lens data area" is stored. area” is provided.

The storage unit 232 in FIG. 5 is provided with an area 41 for storing information about the interchangeable lenses 3 of the first group and an area 42 for storing information about the interchangeable lenses 3 of the second group. Information of 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 area 41 . In this 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 " 1st lens data area" to "8th lens data area".

Further, in the area 41, the body side data calculated by the body side control section 230 based on the correction coefficients stored in the "first lens data area" to the "eighth lens data area" are respectively stored. IDs are stored in the "first lens body side data ID area" to "eighth lens body side data ID area", respectively. The correction coefficient stored in the data area of each lens and the body side data ID stored in the body side data ID area of each lens are associated by the body side control unit 230 .
The correction coefficients for the first group that can be stored in the area 41 are not limited to eight interchangeable lenses 3, and 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 temporary storage section 231 in the "lens data area. ”. Body-side control unit 230 further calculates a body-side data ID based on the correction coefficients stored in the “lens data area”, and stores the calculated body-side data ID in temporary storage unit 231 in “body-side data ID area”. memorize to

The body-side control unit 230 moves the correction coefficient for the first group and its body-side data ID stored in the temporary storage unit 231 to the storage unit 232 at the timing when the camera 1 is turned off, for example. 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. , and the body side data ID stored in the ``body side data ID area'' of the temporary storage unit 231 is stored in the ``first lens body side data ID area'' of the storage unit 41. ” to “8th lens body side data ID area”. 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 body-side control section 230 .

If there is no empty data area among the "data area of the first lens" to "the data area of the eighth lens", the body-side control unit 230, for example, selects 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 with the oldest date and time when the correction coefficient was used is overwritten and stored.
It should be noted that the data area to be overwritten may not be determined based on the date and time of use, but the data area to be overwritten may be determined based on data that is used less frequently or based on the user's settings.

Information on a plurality of interchangeable lenses belonging to the second group can be stored in the area 42 . The information in the area 42 is stored, for example, when the camera body 2 is manufactured or maintained. 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.

Also, 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 coefficients for the second group may be the same as or different from the correction coefficients of the interchangeable lenses 3 belonging to the first group.
Although there is no limit to the number of models of correction coefficients for the second group that can be stored in the area 42, the number of models is limited in order to reduce the storage capacity of the camera body 2, or the correction coefficients are simplified (for example, the first may be limited to fewer kinds of aberrations than the group's correction coefficients). Further, the correction coefficients stored in the area 42 can be updated or overwritten by uploading firmware corresponding to an interchangeable lens released after the camera body 2 is sold.

As described above, in the interchangeable lens 3 of the first group, since the correction coefficients not stored in the camera body 2 are transmitted from the interchangeable lens 3 to the camera body 2, it is possible to check whether or not the correction coefficients have been correctly transmitted. Confirmation is preferred. Therefore, after the correction coefficients are transmitted from the interchangeable lens 3 to the camera body 2, whether the correction coefficients received by the camera body 2 can be used (transmission was performed correctly) or not (transmission was not performed correctly). ), it is preferable to use a data ID whose capacity is smaller than the data amount of all the correction coefficients from the viewpoint of judgment processing. Further, if the interchangeable lens 3 determines whether or not the correction coefficients stored in the camera body 2 can be used, the processing load on the camera body 2 can be suppressed, which is preferable. Furthermore, when the interchangeable lens 3 is used for determination, it is preferable that the amount of data in the data ID is small because the communication load can be suppressed.
On the other hand, the interchangeable lens 3 of the second group does not transmit the correction coefficient from the interchangeable lens 3 to the camera body 2 , nor transmits the data ID from the camera body 2 to the interchangeable lens 3 .

<Description of flow chart>
The process of determining the correction coefficients used in the correction process of the image processing section 270 by the body-side control section 230 of the camera body 2 will be described with reference to the flowcharts of FIGS. 6 and 7. FIG. The chart on the left side of FIG. 6 and FIG. 7 show the flow of processing executed by body-side control section 230 . The chart on the right side of FIG. 6 shows the flow of processing executed by the lens-side controller 330 of the interchangeable lens 3 of the first group.

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

In step S120, the body-side control unit 230 determines whether the attached lens is the first group interchangeable lens 3 or the second group interchangeable lens according to the model name information transmitted from the interchangeable lens. determine whether If the model name information indicates that the interchangeable lens 3 belongs to the first group, the body-side control section 230 makes an affirmative decision in step S120 and proceeds to step S130. If the model name information indicates that the interchangeable lens belongs to the second group, body-side control section 230 makes a negative decision in step S120 and proceeds to step S220.
Note that the process of S130 may be performed after the shooting operation is started. If it takes a long time to determine whether or not the correction coefficients can be used by transmitting/receiving the correction coefficients after the start of the photographing operation, there is a possibility that the photographing timing will be missed. Therefore, it is preferable to transmit and receive the body side data ID after the photographing operation is started so that the determination can be completed quickly, and to send the correction coefficient in advance when there is time such as after starting. Also, whether the attached interchangeable lens belongs to the first group or the second group may be determined based on the model name, or may be determined based on other information.

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

When an interchangeable lens of the first group is attached, body-side control section 230 transmits all body-side data IDs stored in area 41 of storage section 232 from body-side communication section 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 in one data transmission/reception.
Note that the transmission in step S130 may be performed in a plurality of times such as twice. Also, even if 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 of data that can be stored, and exchanges data 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 section 230 receives the information indicating whether or not the interchangeable lens 3 can be used, at the body-side communication section 240, and proceeds to step S150. Information indicating whether or not the camera can be used includes the same 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 determination by the lens-side control unit 330 of the interchangeable lens 3 as to whether or not the lens is connected. When the body side data ID for the first group stored in the area 41 of the storage unit 232 and the lens side data ID stored in the lens side storage unit 350 of the interchangeable lens 3 match, the exchange is performed. The correction coefficients are correctly transmitted from the lens 3 to the camera body 2, the correction coefficients stored in the interchangeable lens 3 and the correction coefficients stored in the camera body 2 are the same, and are not stored in the camera body 2. correction factor is available.

In the present embodiment, the interchangeable lens 3 transmits one of “1”, “2”, . "1" means 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; indicates that "2" means 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; indicates that The same applies to "3" to "8".

"No corresponding data" means 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. 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 and the correction coefficient stored in the lens-side storage unit 350 of the interchangeable lens 3 are different. indicates that
By transmitting one of "1" to "8" and "no corresponding data" as information indicating whether or not the camera can be used, all stored body-side data IDs are transmitted from the camera body 2 to the interchangeable lens 3. Then, the interchangeable lens 3 can be used for discrimination. Therefore, compared to the case where, for example, a plurality of stored body-side data IDs are transmitted to the interchangeable lens 3 one by one and the discrimination result is received from the interchangeable lens 3 each time, the transmission from the interchangeable lens 3 to the camera body 2 is much faster. It is possible to shorten the time required for the determination by suppressing the number of times of determination.

In step S<b>150 , the body-side control unit 230 determines whether or not the correction coefficients for the first group stored in the area 41 of the storage unit 232 can be used in the correction processing of the image processing unit 270 . Body-side control unit 230 makes an affirmative decision in step S150 and proceeds to step S230 when any one of "1" to "8" is received in step S140. In step S230, body-side control unit 230 selects one of the correction coefficients for the first group stored in area 41 of storage unit 232 and corresponds to one of "1" to "8" received in step S140. A decision is made to use the correcting factor to be used and the process according to FIG. 6 is terminated. The image processing unit 270 of the camera body 2 uses the correction coefficients for the first group determined in step S230 to determine the position of the lenses constituting the imaging optical system 360 in the direction of the optical axis O, the aperture diameter of the diaphragm 362 (diaphragm Correction processing is performed by appropriately referring to a necessary value according to the value).

On the other hand, when body-side control section 230 receives "no relevant data" in step S140, it makes a negative decision in step S150 and proceeds to step S160. If a negative determination is made in step S150, for example, when the interchangeable lens 3 is attached to the camera body 2 for the first time after purchase, when the interchangeable lens 3 is attached to the camera body 2 for the first time after purchase, or when the ninth first lens is attached. There is a case where the interchangeable lens 3 of the group is attached.
In step S160, the body-side control section 230 causes the body-side communication section 240 to transmit a transmission request for the correction coefficients stored in the lens-side storage section 350 to the interchangeable lens 3, and proceeds to step S170.

In step S170, the body-side control section 230 receives the correction coefficient transmitted from the interchangeable lens 3 by the body-side communication section 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 in FIG. 7, the body side control section 230 calculates the body side data ID based on the correction coefficient received from the interchangeable lens 3, and proceeds to step S190. Body-side control section 230 stores the calculated body-side data ID in the “area of body-side data ID” of temporary storage section 231 .

In step S190, body-side control section 230 causes body-side data ID stored in temporary storage section 231 to be transmitted from body-side communication section 240 to interchangeable lens 3, and proceeds to step S200. In step S190, body-side control unit 230 may transmit only the body-side data ID stored in temporary storage unit 231. area 41, and then all the body-side data IDs stored in the storage unit 232 may be transmitted in the same manner as in step S130. In step S200, the body-side control section 230 receives the information indicating whether or not the lens can be used, which is transmitted from the interchangeable lens 3, by the body-side communication section 240, and proceeds to step S210.
The information indicating whether or not the interchangeable lens 3 can use the interchangeable lens 3 determines whether or not 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, as in step S140. This is the result determined by the lens-side control unit 330 of . In step S<b>200 , body-side control section 230 receives the determination result as to whether or not only body-side data ID stored in temporary storage section 231 matches lens-side data ID stored in interchangeable lens 3 . receive the determination result as to whether or not there is a lens-side data ID that matches the lens-side data ID stored in the interchangeable lens 3 among all the body-side data IDs stored in the area 41 of the storage unit 232. You can

In step S<b>210 , body-side control section 230 determines whether or not correction coefficients stored in area 41 of temporary storage section 231 or storage section 232 can be used in correction processing of image processing section 270 . When body-side control section 230 receives the determination result that the body-side data ID and lens-side data ID match in step S200, it makes an affirmative determination in step S210 and proceeds to step S240. Body-side control unit 230 determines to use the correction coefficient of the lens 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 uses the correction coefficient determined in step S240 to determine the position of the lens that constitutes the imaging optical system 360 in the direction of the optical axis O, and the aperture diameter (aperture value) of the diaphragm 362. Correction processing is performed by appropriately referring to such values.

On the other hand, when body-side control section 230 receives the determination result that the body-side data ID and lens-side data ID do not match in step S200, it makes a negative determination in step S210 and proceeds to step S250. If 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, body-side control section 230 performs predetermined error processing in step S250, and ends the processing in FIG.
For the error processing, for example, a message may be displayed on the display unit 290 to prompt the user to clean the body-side terminals and the lens-side terminals.

<Interchangeable lens side>
When communication is established with the attached camera body 2, the lens-side control section 330 starts the processing shown in FIG. In step S310 of FIG. 6, the lens-side control section 330 receives a model name information request instruction 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 the process proceeds to step S330. In step S<b>330 , the lens-side control section 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 section 340, the lens side control section 330 makes an affirmative determination in step S330 and proceeds to step S340. When the body side data ID from the camera body 2 is not received by the lens side communication section 340, the lens side control section 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 section 330 performs time-out determination in step S400. If the time for waiting for reception exceeds the predetermined time, lens-side control section 330 makes an affirmative decision in step S400 and terminates the processing in FIG. Lens-side control section 330 makes a negative determination in step S400 and returns to step S330 when the time for waiting for reception is less than the predetermined time.

When the body side data ID is received from the camera body 2, the lens side control section 330 performs verification processing in step S340. In the collation process, all the body-side data IDs transmitted from the camera body 2 contain those that match the lens-side data IDs stored in the lens-side storage unit 350, in other words, the same data IDs. This is the process of determining whether or not there is. In steps S<b>350 and S<b>360 , the lens side control section 330 transmits the matching result to the camera body 2 . In step S350, the lens-side control unit 330 transmits any 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 unit 330 transmits "no applicable 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 belong to the first group in step S120 does not appropriately perform the matching process in step S340, it transmits any one of "1" to "8" as the matching result in step S350. I will explain what happens. As described above, the image processing section 270 of the camera body 2 uses the correction coefficients stored in the area 41 of the storage section 232 to perform correction processing. At this time, among the correction coefficients stored in the area 41 of the storage unit 232, the information of the verification result transmitted from the interchangeable lens, that is, the correction coefficients corresponding to "1" to "8" are used for the correction processing. With this configuration, if the matching process in step S340 is not properly performed, the correction coefficient of another interchangeable lens 3, which is completely different from the optical characteristics of the attached interchangeable lens, is used for the correction process. It will be. Therefore, for example, when an interchangeable lens having distortion aberration as shown in FIG. In other words, a correction process that enlarges the bulge is performed. Therefore, by performing verification using the data ID, it is possible to perform image processing that matches the optical characteristics of each interchangeable lens.

In this embodiment, since the optical information includes individual differences, correction can be performed in consideration of the individual differences for each line. In other words, even if the interchangeable lenses 3 have the same model name, image processing can be performed using optical information that takes individual differences into account. In addition, although individual differences are included, the amount of optical information data may increase, but it is possible to determine whether or not optical information can be adopted with a single simple identifier.

According to the embodiment described above, the following effects are obtained.
(1) The interchangeable lens 3 detachable from the camera body is calculated by the lens side storage unit 350 that stores the optical information of the imaging optical system 360 and the camera body 2 (body side control unit 230) based on the optical information. and a lens-side control unit 330 that acquires the body-side identifier from the camera body 2 . Since it is configured in this manner, the lens-side control section 330 of the interchangeable lens 3 can, for example, determine whether or not the same optical information as the optical information stored in the lens-side storage section 350 exists on the camera body 2 side. can also Therefore, the processing load on the camera body 2 can be reduced as compared with the case where the determination is made only on the camera body 2 side.

Also, the body-side identifier acquired from the camera body 2 may have a smaller data amount than the optical information, but is not limited to this. Compared to the case where the optical information itself is acquired from the camera body 2 and the optical information stored in the lens-side storage unit 350 in the interchangeable lens 3 is determined by using the body-side identifier with a small amount of data. Therefore, the burden of communication processing between the camera body 2 and the interchangeable lens 3 and the burden of 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. Therefore, the processing load on the interchangeable lens 3 can be reduced.

(3) The lens-side controller 330 of the interchangeable lens 3 determines whether or not 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 section 350 exists in the camera body 2 .

(4) The interchangeable lens 3 includes a lens side communication section 340 that transmits optical information to the camera body 2 . With this configuration, optical information can be transmitted to the camera body 2 even 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 transmission section 340 transmits the 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 this configuration, it is possible to limit the opportunity of transmitting optical information from the interchangeable lens 3 to the camera body 2 when it is determined that they do not match, thereby reducing the burden of communication processing.

(6) The lens-side control unit 330 can acquire a plurality of body-side identifiers, and the lens-side control unit 330 determines whether an identifier that matches the lens-side identifier exists among the acquired plurality of body-side identifiers. determine whether or not With this configuration, a plurality of stored body side identifiers can be checked by one data reception rather than receiving and checking the stored body side identifiers one by one. Therefore, it is possible to shorten the time required to confirm the body side identifier.

(7) The determination method performed by the interchangeable lens 3 detachable from the camera body 2 is to obtain from the camera body 2 a body-side identifier calculated by the camera body 2 based on the optical information of the interchangeable lens 3, and It includes determining whether or not the calculated lens-side identifier and the body-side identifier match. According to this determination method, since the interchangeable lens 3 makes the determination, the processing load on the camera body 2 can be reduced compared to when the determination is made only by the camera body 2 .

(8) The interchangeable lens 3 detachable from the camera body includes an imaging optical system 360 that forms an image of light from a subject, and a lens-side identifier calculated by adding at least part of the optical information of the imaging optical system 360. and 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 for identifying this optical information can be stored in the lens side storage section 350 . Further, the lens side control section 330 can use the lens side identifier to determine whether or not the same optical information as the optical information stored in the lens side storage section 350 exists on the camera body 2 side. Therefore, when the interchangeable lens 3 performs processing using the lens side identifier (in this embodiment, it is determined whether the lens side identifier matches the body side identifier), it is necessary to calculate the lens side identifier each time. Therefore, the burden of processing the interchangeable lens 3 can be reduced.

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

(10) The lens-side storage unit 350 stores optical information based on aberrations that vary according to at least one of focal length, photographing distance, and image height. With this configuration, the accuracy of processing using optical information can be improved.
Also, optical information based on varying aberrations may be managed with 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 corresponding to the aberration of the imaging optical system 360 of the interchangeable lens 3 . In general, there are individual differences in imaging optical systems, but with this configuration, it is possible to obtain optical information according to aberrations, taking into account individual differences in 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 this configuration, it is possible to reduce the processing load of the matching process using the lens-side identifier as compared with the processing load of the matching process using the optical information itself. Further, by transmitting and receiving an identifier with 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 section 340 that communicates with the camera body 2. The lens-side communication section 340 transmits the optical information to the camera body 2 and transmits the lens-side identifier to the camera body. Do not send to body 2. With this configuration, the body-side identifier can be calculated by the camera body 2, and it can be confirmed whether the optical information is correctly transmitted and received.

(14) The method of manufacturing the interchangeable lens 3 detachable from the camera body 2 includes disposing an imaging optical system 360 that forms an image of light from a subject, and adding at least part of optical information based on the aberration of the imaging optical system 360. This includes storing the lens-side identifier and the optical information calculated together in the lens-side storage unit 350 . 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 this optical information can be stored.

(15) The method for manufacturing the interchangeable lens 3 includes measuring the optical information of the imaging optical system 360 and storing the lens side identifier and the optical information in the lens side storage section 350 based on the measurement results. With this configuration, it is possible to store optical information that reflects the unique aberration characteristics of the imaging optical system 360 .

(16) The camera body 2 to which the interchangeable lens 3 is attachable/detachable has a body-side controller 230 that acquires optical information based on the aberration of the interchangeable lens 3, and a body-side identifier obtained by adding at least part of the optical information. , and the storage unit 232 stores the body-side identifier and the corresponding optical information for each of the plurality of interchangeable lenses 3 . With this configuration, the body-side identifier is sent from the camera body 2 to the interchangeable lens 3, and the interchangeable lens 3 can determine whether or not the body-side identifier and the lens-side identifier match. Also, 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. In addition, the camera body 2 can also store optical information about a plurality of interchangeable lenses that have been attached in the past in association with each calculated body-side identifier. In other words, since the optical information for a plurality of lenses can be stored in the camera body 2 in association with the body-side identifier, the optical information can be kept even if the interchangeable lens is removed, and the same optical information can be retained next time. There is no need to re-receive the optical information when the lens is attached, and the number of times the optical information is received from the interchangeable lens can be reduced.

(17) The camera body 2 is provided with the body-side communication section 240 that transmits a plurality of body-side identifiers stored in the storage section 232 to the interchangeable lens 3 . Since it is configured in this manner, the camera body 2 can transmit a plurality of body-side identifiers for a plurality of interchangeable lenses attached in the past to the interchangeable lens 3, and obtain a determination result.

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

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

(20) When the camera body 2 is determined by the body-side control unit 230 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, Optical information is requested from the interchangeable lens 3 . With this configuration, it is possible to limit the transmission request of optical information from the interchangeable lens 3 to the camera body 2 only when it is determined that they do not match. Therefore, the burden of communication processing can be reduced.

(21) The camera body 2 is associated with the body-side identifier that is 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 this configuration, it is possible to perform processing according to the aberration of the imaging optical system 360 of the attached 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 date and time of use and the frequency of use. 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 body-side identifier and the corresponding optical information.

(23) The determination method in the camera body 2 to which the interchangeable lens 3 is detachable is to obtain optical information based on the aberration of the interchangeable lens 3, and associate a body-side identifier obtained by adding at least part of the optical information to the optical information. a plurality of body-side identifiers stored in the storage unit 232 are transmitted to the interchangeable lens 3, and information as to whether or not the lens-side identifier and the body-side identifier stored in the interchangeable lens 3 match. Receive from the interchangeable lens 3 . With this configuration, both the optical information of the interchangeable lens 3 and the body-side identifier used for identifying this optical information can be associated and stored in the storage unit 232 . In addition, since the body-side identifier is calculated by summing at least a part of the optical information, even if the interchangeable lenses 3 of the same model have different optical information for each lens, the identifier is different for each lens. can be managed by Furthermore, since information as to whether or not the lens-side identifier and the body-side identifier match is received from the interchangeable lens 3, there is no need for the camera body 2 to determine whether or not they match. The processing load on the body 2 can be reduced.

The following modifications are also within the scope of the present invention, and it is also possible to combine one or more of the modifications with the above-described embodiments.
(Modification 1)
The timing of data transfer from the temporary storage unit 231 to the storage unit 232 can be changed as appropriate. For example, when the power of the camera 1 is turned off, the camera body 2 stores the correction coefficient stored in the “lens data area” of the temporary storage unit 231 and the body side data stored in the “body side data ID area”. It may be moved to the storage unit 232 while being associated with the data ID.

(Modification 2)
In general, the interchangeable lens 3 has a type that incorporates a teleconverter. The interchangeable lens 3 with 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 in which the teleconverter is inserted into the optical path and a state in which it is retracted from the optical path. When the teleconverter is inserted into the optical path (referred to as when the teleconverter is used), the focal length of the imaging optical system 360 is longer than when the teleconverter is retracted from the optical path (referred to as when the teleconverter is not used). 1.4 times). When a teleconverter is used, the lens configuration of the imaging optical system 360 includes a teleconverter lens. On the other hand, when the teleconverter is not used, the lens configuration of the imaging optical system 360 does not include the teleconverter lens.

As described above, the focal length differs between when the teleconverter is used and when it is not used, so the optical characteristics of the imaging optical system 360 differ between when the teleconverter is used and when it is not used. Therefore, the interchangeable lens 3 with a built-in teleconverter is provided with a correction coefficient when using the teleconverter and a correction coefficient when not using the 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 and its lens-side data ID when the teleconverter is used and the correction coefficient and its lens-side data ID when the teleconverter is not used are stored.

The lens-side control unit 330 of the interchangeable lens 3 with a built-in teleconverter detects whether the teleconverter is used or not based on the output of a sensor (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 is used when the teleconverter is not used. Further, when transmitting the correction coefficient in step S380, when the teleconverter is used, the correction coefficient when the teleconverter is used is transmitted, and when the teleconverter is not used, the correction coefficient when the teleconverter is not used is transmitted.

According to Modification 2, in the interchangeable lens 3 with a built-in teleconverter, the correction coefficient and its lens-side data ID when the teleconverter is used and the correction coefficient and its lens-side data ID when the teleconverter is not used are stored in the lens-side storage unit. Stored in 350. Then, in the collation process in step S340 and in the case of transmitting the correction coefficient in step S380, the lens-side data ID or the correction coefficient corresponding to when the teleconverter is used and when it is not used is used. Since the camera body 2 is configured to be able to store correction coefficients and body-side data IDs for a plurality of lines, it is not necessary to transmit correction coefficients each time the teleconverter is switched between use and non-use. Also, the interchangeable lens 3 with 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 whether the teleconverter is used or not, or instructs the interchangeable lens 3 to transmit the correction coefficient by designating the teleconverter use/non-use state in step S160. It may be done.

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 Part 310... Lens side mount 330... Lens side control part 340... Lens side communication part 350... Lens side storage part 360... Imaging optical system 361a... Focusing lens 361b... Zoom lens

Claims (7)

An interchangeable lens that can be attached to and detached from a camera body,
a storage unit that stores optical information based on aberrations including individual differences of the interchangeable lens, and a lens-side identifier that is a result calculated by adding numerical values of at least part of the optical information ;
an acquisition unit configured to acquire, from the camera body, a body-side identifier calculated by the camera body by adding numerical values of at least part of the optical information . In the interchangeable lens according to claim 1,
The interchangeable lens, wherein the lens-side identifier is a result calculated by adding at least part of coefficients based on distortion aberration of the interchangeable lens. In the interchangeable lens according to claim 1 or 2,
An interchangeable lens comprising a determination unit that determines whether the body-side identifier acquired by the acquisition unit matches the lens -side identifier. In the interchangeable lens according to any one of claims 1 to 3,
An interchangeable lens comprising a transmission section that transmits the optical information to the camera body and does not transmit the lens side identifier to the camera body . In the interchangeable lens according to claim 4,
a determination unit that determines whether the body-side identifier acquired by the acquisition unit and the lens -side identifier match,
The transmission section is an interchangeable lens configured to transmit the optical information to the camera body when the determination section determines that the body-side identifier and the lens-side identifier do not match. In the interchangeable lens according to any one of claims 3 and 5,
The acquisition unit can acquire a plurality of the body-side identifiers,
The interchangeable lens, wherein the determination unit determines whether or not an identifier matching the lens-side identifier exists among the plurality of body-side identifiers acquired by the acquisition unit. A determination method for an interchangeable lens detachable to a camera body,
obtaining from the camera body a body-side identifier calculated by adding together at least part of numerical values of optical information based on aberrations including individual differences of the interchangeable lens;
A determination method including determining whether or not a lens-side identifier, which is a result calculated by adding numerical values of at least part of the optical information, matches the body-side identifier.

Images