JP2014178663A - Interchangeable lens and camera body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To subject a picked-up image to a correction suitable for the photographic environment.SOLUTION: An interchangeable lens 200 comprises mount means 201 which a camera body 100 is detachably attached to, communication means 217 that communicates with the camera body 100, storage means 215 in which lens data for land photography is stored, and conversion means 203 that converts the lens data for land photography to lens data for underwater photography.

Description

  The present invention relates to an interchangeable lens and a camera body.

  An interchangeable lens type camera system capable of underwater photography is known (Patent Document 1). In this camera system, the camera body discriminates the type of the interchangeable lens based on the lens data received from the interchangeable lens, and performs exposure correction and forcible flash emission during underwater shooting according to the identified interchangeable lens type. It is configured.

JP 2006-243659 A

  In underwater photography, unlike land photography, water mediates between the lens and the subject, so there are different data for land lens data and underwater lens data. However, since this point is not taken into consideration in the prior art, there is a possibility that correction suitable for the shooting environment cannot be performed when correction processing (for example, blur correction or aberration correction) is performed on a captured image using lens data. there were.

(1) An interchangeable lens according to the first aspect of the present invention includes a mount unit on which a camera body is detachably mounted, a communication unit that communicates with the camera body, a storage unit that stores lens data for land photography, Conversion means for converting lens data for land photography into lens data for underwater photography.
(2) An interchangeable lens according to a second aspect of the present invention includes a mount unit to which a camera body is detachably attached, a communication unit that communicates with the camera body, lens data for land photography, and lens data for underwater photography. And storage means for storing the information.
(3) A camera body according to a fourth aspect of the present invention is directed to a mount means to which an interchangeable lens capable of outputting lens data for land photography and lens data for underwater photography is detachably attached; A determination unit that determines whether or not there is water, and when the determination unit determines that it is underwater, the lens data for underwater shooting is requested from the interchangeable lens, and the lens data for underwater shooting is received from the interchangeable lens. And communication means for requesting the lens data for land photographing from the interchangeable lens and receiving the lens data for land photographing from the interchangeable lens when the distinguishing means determines that it is not underwater. Features.
(4) The camera body according to the invention described in claim 5 requires mount means for detachably mounting an interchangeable lens capable of outputting lens data for land photography, and requires lens data for land photography for the interchangeable lens. Then, the communication means for receiving the lens data for land photographing from the interchangeable lens, the judging means for judging whether or not it is underwater, and if it is judged that it is underwater by the judging means, Conversion means for converting the lens data into lens data for underwater photography.

  According to the present invention, it is possible to perform correction suitable for a shooting environment on a captured image.

It is a figure explaining the lens-interchangeable camera system to which this invention is applied. 1 is a configuration block diagram of an interchangeable lens type camera system to which the present invention is applied. It is a schematic diagram which shows the detail of a contact part. It is a flowchart explaining the flow of the communication process of an amphibious lens and a camera body. It is a flowchart explaining the flow of a communication process of a land only lens and a camera body.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining an interchangeable lens type camera system according to an embodiment of the present invention. The camera body 100 has a waterproof function and can shoot underwater in addition to shooting on land.

  As shown in FIG. 1A, the camera body 100 has an interchangeable lens (hereinafter referred to as an amphibious lens) 200 having a waterproof function and capable of photographing underwater in addition to photographing on land. Can be attached.

  In addition, as shown in FIG. 1B, an interchangeable lens (hereinafter referred to as a land-only lens) 300 that does not have a waterproof function can be attached to the camera body 100. When performing underwater shooting using the land-only lens 300, the waterproof housing 400 is attached to the land-only lens 300 to perform shooting.

  FIG. 2 is a configuration block diagram of this camera system. In FIG. 2, only the devices and apparatuses according to the present invention are shown, and illustration and description of other devices and apparatuses are omitted. In FIG. 2, the amphibious lens 200 and the land-only lens 300 will be collectively described as interchangeable lenses 200 and 300 in order to explain the configuration common to the amphibious lens 200 and the land-only lens 300.

  The interchangeable lenses 200 and 300 are provided with a lens side mount 201 to which the camera body 100 is detachably attached. In addition, the interchangeable lenses 200 and 300 include an imaging optical system 210 that forms a subject image. The imaging optical system 210 includes a plurality of lenses 210a to 210c. The plurality of lenses 210a to 210c includes a focusing lens 210b for controlling the focus position of the subject image.

  Inside the interchangeable lenses 200 and 300, a lens control unit 203 that controls each part of the interchangeable lenses 200 and 300 is provided. The lens control unit 203 includes a microcomputer (not shown) and its peripheral circuits. The lens control unit 203 is connected to the lens side first communication unit 217, the lens side second communication unit 218, the lens driving unit 212, the lens position detection unit 213, the ROM 215, and the RAM 216.

  The lens-side first communication unit 217 and the lens-side second communication unit 218 are configured to be able to exchange signals with the camera body 100 via each communication contact of the contact unit 202 provided on the lens-side mount 201. Has been. The first lens side communication unit 217 and the second lens side communication unit 218 are communication interfaces on the interchangeable lenses 200 and 300 side, respectively. The lens control unit 203 performs data communication (hotline communication, command data communication) described later with the camera body 100 (a body control unit 103 described later) using these communication interfaces.

  The lens driving unit 212 includes an actuator such as a stepping motor, for example, and drives the focusing lens 210b in accordance with a signal input to the lens driving unit 212. The focusing lens 210b is driven in the optical axis direction by the lens driving unit 212. The lens position detection unit 213 is configured by, for example, an encoder connected to the focusing lens 210b, and detects the position of the focusing lens 210b in the optical axis direction.

  The ROM 215 is a non-volatile storage medium, and stores in advance a predetermined control program executed by the lens control unit 203, lens data to be described later, and the like. The RAM 216 is a volatile storage medium and is used as a storage area for various data by the lens control unit 203.

  The camera body 100 is provided with a body side mount 101 to which the interchangeable lenses 200 and 300 are detachably attached. Further, an imaging element 104 such as a CMOS or CCD is provided behind the body side mount 101 in the camera body 100.

  A shutter 115 for controlling the exposure state of the image sensor 104 and an optical filter 116 combining an optical low-pass filter and an infrared cut filter are provided on the front surface of the image sensor 104. The subject light that has passed through the imaging optical system 210 enters the image sensor 104 through the shutter 115 and the optical filter 116.

  In addition, a body control unit 103 that controls each part of the camera body 100 is provided inside the camera body 100. The body control unit 103 includes a microcomputer (not shown) and its peripheral circuits. The body control unit 103 is connected to the first body-side communication unit 117, the second body-side communication unit 118, the underwater sensor 119, and the operation member 120.

  The body-side first communication unit 117 and the body-side second communication unit 118 can exchange signals with the interchangeable lenses 200 and 300 via each communication contact provided on the contact unit 102 of the body-side mount 101. It is configured. The body-side first communication unit 117 and the body-side second communication unit 118 are communication interfaces on the camera body 100 side, respectively. The body control unit 103 performs data communication (hotline communication, command data communication) described later with the lens control unit 203 of the interchangeable lenses 200 and 300 using these communication interfaces.

  The underwater sensor 119 is a sensor that detects whether or not the camera body 100 is in the water, and outputs a signal indicating the detection result to the body control unit 103. A known sensor may be used as the underwater sensor 119. As a known underwater sensor, for example, a sensor that detects whether the camera body 100 is in water based on the pressure applied to the camera body 100 or the conductivity around the camera body 100 is known.

  The operation member 120 includes various input members operated by the user, for example, a mode switching button, a shutter button, a recording button, a cross key, and a determination button. The operation member 120 sends an operation signal corresponding to each operation to the body control unit 103 when each button is pressed. The body control unit 103 performs various processes in accordance with operation signals from the operation member 120.

  A display device 111 configured by an LCD panel or the like is disposed on the back surface of the camera body 100. The body control unit 103 displays various menu screens for setting a subject image based on the output of the image sensor 104, shooting conditions, and the like on the display device 111.

(Description of the contact portions 102 and 202)
FIG. 3 is a schematic diagram showing details of the contact portion 102 provided on the body side mount 101 and the contact portion 202 provided on the lens side mount 201. As shown in FIG. 3, twelve contacts BP <b> 1 to BP <b> 12 exist in the contact portion 102. Further, the contact portion 202 has 12 contacts LP1 to LP12 corresponding to the 12 contacts described above.

  The contact BP1 and the contact BP2 are connected to the power transmission unit 130 in the camera body 100. The power transmission unit 130 supplies the operating voltage of each part in the interchangeable lenses 200 and 300 excluding a circuit (lens driving unit 212) having a driving system such as an actuator and a relatively large power consumption to the contact point BP1. That is, the operating voltage of each part in the interchangeable lenses 200 and 300 excluding the above driving parts is supplied from the contact BP1 and the contact LP1. The contact BP2 is a ground terminal corresponding to the operating voltage given to the contact BP1. That is, the contact BP2 and the contact LP2 are ground terminal voltages corresponding to the above operating voltage. The contact LP1 and the contact LP2 are connected to the power receiving unit 230 in the interchangeable lenses 200 and 300. The power receiving unit 230 supplies the power supplied from the camera body 100 to each unit in the interchangeable lenses 200 and 300 including the lens control unit 203. These contacts LP1, LP2, BP1, BP2 constitute a power supply system contact for supplying power from the camera body 100 side to the interchangeable lenses 200, 300 side.

  The contacts BP3, BP4, BP5, and BP6 are connected to the body-side first communication unit 117. The contact points LP3, LP4, LP5, and LP6 on the interchangeable lens 200 and 300 side corresponding to these contact points are connected to the lens-side first communication unit 217. The body-side first communication unit 117 and the lens-side first communication unit 217 transmit and receive data to and from each other using these contact points (communication system contact points) LP3 to LP6. In the present embodiment, communication performed between the body control unit 103 and the body side first communication unit 117 and the lens control unit 203 and the lens side first communication unit 217 is referred to as “command data communication”. In this command data communication, the lens control unit 203 controls the lens-side first communication unit 217 to receive control data from the body-side first communication unit 117 and response data to the body-side first communication unit 117. Is transmitted in parallel with the first predetermined cycle (for example, 16 milliseconds in this embodiment).

  In command data communication, a clock signal is output from the body-side first communication unit 117 to the signal line CLK constituted by the contact BP3 and the contact LP3. A data signal is output from the body-side first communication unit 117 to the signal line BPAT constituted by the contact BP4 and the contact LP4 in synchronization with the clock signal. A data signal is output from the lens-side first communication unit 217 to the signal line LPAT configured by the contact BP5 and the contact LP5 in synchronization with the clock signal. A communication availability signal indicating whether command data communication is possible is output from the lens-side first communication unit 217 to the signal line RDY configured by the contact BP6 and the contact LP6.

  The contacts BP7, BP8, BP9, and BP10 are connected to the body-side second communication unit 118. The contact points LP7, LP8, LP9, and LP10 on the interchangeable lens 200, 300 side corresponding to these contact points are connected to the lens side second communication unit 218. The lens-side second communication unit 218 transmits data to the body-side second communication unit 118 using these contacts (communication system contacts). In the present embodiment, communication performed between the lens control unit 203 and the second lens side communication unit 218, and the body control unit 103 and the second body side communication unit 118 is referred to as “hotline communication”. The body control unit 103 is configured to start hotline communication every second predetermined period (for example, 1 millisecond in this embodiment). This period is shorter than the period for performing command data communication. In the hotline communication, the lens control unit 203 controls the lens side second communication unit 218 and transmits lens position data to the body side second communication unit 118. The lens position data is data representing a detection result of the position of the focusing lens 210b.

  An L level signal is output from the body-side second communication unit 117 to the signal line HREQ constituted by the contact BP7 and the contact LP7 when hot line communication is started. When the lens-side second communication unit 218 detects this signal, the lens control unit 203 generates lens position data. When the generation of the lens position data is completed, an L level signal is output from the lens side second communication unit 218 to the signal line HANS configured by the contact BP8 and the contact LP8. When the body-side second communication unit 118 detects this signal, a clock signal is output from the body-side second communication unit 118 to the signal line HCLK configured by the contact BP9 and the contact LP9. In synchronism with this clock signal, a lens position data signal representing lens position data is output from the lens-side second communication unit 218 to the signal line HDAT constituted by the contact BP10 and the contact LP10. When the transmission of the lens position data signal is completed, an H level signal is output from the lens side second communication unit 218 to the signal line HANS. The body-side second communication unit 118 outputs an H level signal to the signal line HREQ in response to the input of this signal.

  Note that the command data communication and the hotline communication can be executed simultaneously or partially in parallel. That is, one of the lens side first communication unit 217 and the lens side second communication unit 218 can communicate with the camera body 100 even when the other is communicating with the camera body 100. is there.

  The contact BP11 and the contact BP12 are connected to the power supply circuit 140 in the camera body 100. The power supply circuit 140 supplies, to the contact point BP12, a driving voltage of a circuit (such as the lens driving unit 212) having a driving system such as an actuator and having relatively large power consumption. That is, the driving voltage of each driving unit is supplied from the contact point BP12 and the contact point LP12. The contact BP11 is a ground terminal corresponding to the drive voltage given to the contact BP12. That is, the contact BP11 and the contact LP11 are ground terminals corresponding to the drive voltage. These contacts LP11, LP12, BP11, BP12 constitute a power supply system contact for supplying power from the camera body 100 side to the interchangeable lenses 200, 300 side.

(Lens data)
The camera body 100 according to the present embodiment is configured to perform correction processing on a captured image captured by the image sensor 104 using lens data including data regarding optical characteristics unique to the interchangeable lenses 200 and 300. . The lens data includes, for example, focal length information, magnification chromatic aberration information, curvature aberration amount information, VR (Vibration Reduction) coefficient, exit pupil position information, image field curvature information, peripheral light amount information, MTF (Modulation Transfer Function). The lens data is stored in a memory (ROM 215 in the case of the interchangeable lens 200) in each interchangeable lens.

  Also, underwater photography, unlike land photography, water is mediated between the lens and the subject, so there is data different from land lens data and underwater lens data. As an example, consider the case where the waterproof window installed in front of the lens is parallel plane glass. In this case, the exit pupil position information, the imaging field curvature information, and the peripheral light amount information do not change between underwater shooting and land shooting. On the other hand, focal length information, magnification chromatic aberration information, curvature aberration amount information, MTF information, and VR coefficient vary between underwater shooting and land shooting.

  For example, the focal length information will be described. In the interchangeable lenses 200 and 300, a front focal length and a rear focal length are defined. In the case of land (in the air), the front focal length and the rear focal length are the same. On the other hand, in the case of underwater, the rear focal length that controls the image formation is the same as in air, but the front focal length that controls the incident angle of view is higher than the refractive index of water (the refractive index of air). 1.333) times longer than the rate. Therefore, the angle of view becomes narrow underwater. Since the F value is determined by the rear focal length, it does not change between underwater and air. Thus, the front focal length differs between water and air, and the rear focal length is the same.

  The VR coefficient will be described. In the camera body 100, the blur angle is obtained using the focal length and the VR coefficient at the time of blur correction. When the focal length is converted to an underwater value during underwater shooting, the VR coefficient need not be changed from the value in the air. However, if the focal length is not converted to a value in water (that is, a value in air), the VR coefficient needs to be converted to a value in water. The conversion to the underwater VR coefficient can be performed by dividing the in-air VR coefficient by the refractive index of water.

  Furthermore, magnification chromatic aberration information and curvature aberration amount information will be described. In the case of the land-based lens 300, a waterproof window is installed in front of the lens by the waterproof housing 400 in underwater shooting, but a waterproof window is not installed in front of the lens in land shooting. Therefore, during underwater photography, lateral chromatic aberration generated in the waterproof window is added to lateral chromatic aberration that occurs during land photography. Therefore, the conversion into lateral chromatic aberration or curvature aberration in water can be performed, for example, by adding lateral chromatic aberration or curvature aberration that theoretically occurs in a waterproof window to lateral chromatic aberration or curvature aberration in air. .

  Further, in the case of the amphibious lens 200, there is no change in that there is a waterproof window in front of the lens in both underwater photography and land photography. However, the lateral chromatic aberration generated by the waterproof window differs between underwater and air. Therefore, the conversion to lateral chromatic aberration or curvature aberration in water is, for example, the difference between air and water in the lateral chromatic aberration or curvature aberration that theoretically occurs in waterproof windows with respect to lateral chromatic aberration or curvature aberration. This can be done by adding.

Note that the lateral chromatic aberration and curvature aberration that theoretically occur in the waterproof window can be approximately obtained using, for example, the following equation (1). In Expression (1), α is a coefficient, and y is the image height. N is an index of y, for example, n = 1 to 3. In equation (1), Σ represents a summation operation of a predetermined range related to n. That is, the expression (1) is a polynomial having the image height y as a variable.
Aberration amount = Σα * y ^ n (1)

  Next, the MTF information will be described. The MTF at the center of the screen hardly changes between the water and the land, but the MTF around the screen is greatly reduced by the chromatic aberration of magnification generated in the waterproof window described above. As the MTF information reflecting this change (as information indicating that the MTF tends to be lower in water than on land), the interchangeable lens (interchangeable lens 200) of this embodiment has an internal memory (ROM 215). In addition, MTF information for underwater and MTF information for land are individually provided. On the camera side, contour enhancement processing and contrast enhancement processing for the captured image are controlled by using the amount of change of the MTF information between the water and the land (particularly the amount of change around the screen). Specifically, contour enhancement processing and contrast enhancement processing for an image photographed underwater are processed more strongly than processing for an image photographed on land. Thus, the lens data in water and the lens data on land (in the air) are different. Therefore, the camera body 100 according to the present embodiment performs correction processing on a captured image using underwater lens data (hereinafter referred to as underwater lens data) during underwater shooting, and the land ( It is configured to perform correction processing on a captured image using lens data (hereinafter referred to as land lens data) in the air.

  The correction process using the lens data includes, for example, a process for correcting the shake of the captured image based on the shake angle obtained from the focal length and the VR coefficient, and the image pickup based on the magnification chromatic aberration information and the curvature aberration information. There are a process for correcting aberrations of an image, a process for performing the above-described edge enhancement process and contrast enhancement process based on MTF information, and the like.

  Next, a process in which the camera body 100 acquires lens data from the interchangeable lenses 200 and 300 will be described. This process is different for the amphibious lens 200 and the land-only lens 300, and will be described separately.

(Communication between amphibious lens and camera body)
FIG. 4 is a flowchart for explaining processing in which the amphibious lens 200 and the camera body 100 communicate lens data. The process executed by the body control unit 103 of the camera body 100 is shown on the left side of FIG. 4, and the process executed by the lens control unit 203 of the amphibious lens 200 is shown on the right side of FIG.

  In step S <b> 101, the body control unit 103 requests lens type data from the amphibious lens 200 via the body-side first communication unit 117. The lens type data is data indicating whether the interchangeable lens is the amphibious lens 200 or the land-only lens 300. The lens type data is stored in the ROM 215 in the amphibious lens 200 and the land-only lens 300, respectively.

  In step S <b> 201, the lens control unit 203 determines whether lens type data is requested from the camera body 100. When the lens type data is requested, the lens control unit 203 proceeds to step S202, reads the lens type data from the ROM 215, and transmits the lens type data via the lens side first communication unit 217.

  In step S <b> 102, the body control unit 103 determines whether lens type data has been received from the amphibious lens 200. If the body control unit 103 receives the lens type data, the process proceeds to step S103.

  Note that such lens type data communication (steps S101 to S102 and S201 to S202) is performed by initial communication between the camera body 100 and the amphibious lens 200. The initial communication here is executed by the body control unit 103 and the lens control unit 203, for example, when the power switch of the camera body 100 is turned from OFF to ON or when the amphibious lens 200 is attached to the camera body 100. Refers to the communication that is performed.

  In step S103, the body control unit 103 determines whether the interchangeable lens currently mounted is the amphibious lens 200 or the land-only lens 300 based on the received lens type data. Here, since the case where the amphibious lens 200 is mounted is described, the body control unit 103 determines that the amphibious lens 200 is currently mounted, and proceeds to step S104.

  In step S <b> 104, the body control unit 103 determines whether the camera body 100 is in the water based on the detection signal from the underwater sensor 119. When it is determined that the camera body 100 is underwater, the body control unit 103 proceeds to step S105, and when it is determined that the camera body 100 is not underwater (that is, on land), the body control unit 103 proceeds to step S107.

  In step S <b> 105, the body control unit 103 requests underwater lens data from the amphibious lens 200 via the body-side first communication unit 117.

  In step S <b> 203, the lens control unit 203 determines whether underwater lens data is requested from the camera body 100. The lens control unit 203 proceeds to step S204 when the underwater lens data is requested, and proceeds to step S206 when the underwater lens data is not requested.

  In the amphibious lens 200 of this embodiment, land lens data corresponding to various lens positions is stored in the ROM 215. In step S204, the lens control unit 203 reads the land lens data corresponding to the current lens position from the ROM 215, and converts the land lens data into underwater lens data using the conversion method described above.

  In step S205, the lens control unit 203 transmits the underwater lens data converted in step S204 to the camera body 100 via the lens side first communication unit 217.

  In step S <b> 106, the body control unit 103 determines whether underwater lens data has been received from the amphibious lens 200. If the body control unit 103 receives the underwater lens data, the process proceeds to step S109.

  On the other hand, in step S107 that proceeds when the camera body 100 is on land, the body control unit 103 requests land lens data from the amphibious lens 200 via the body-side first communication unit 117.

  In step S <b> 206, the lens control unit 203 determines whether land lens data is requested from the camera body 100. The lens control unit 203 proceeds to step S207 when the land lens data is requested, and returns to step S203 when the land lens data is not requested.

  In step S <b> 207, the lens control unit 203 reads the land lens data corresponding to the current lens position from the ROM 215 and transmits the data to the camera body 100 via the lens-side first communication unit 217.

  In step S <b> 108, the body control unit 103 determines whether or not land lens data is received from the amphibious lens 200. The body control unit 103 proceeds to step S109 when the land lens data is received.

  Note that such lens data communication (steps S105 to S108 and S203 to S207) is performed each time by command data communication between the camera body 100 and the amphibious lens 200 during the photographing mode. Further, whether or not the camera body 100 is in water in step S104 is determined every time immediately before this command data communication. In the shooting mode, a through image is displayed on the display device 111. The through image is an image for monitoring that is imaged by the image sensor 104 at a predetermined frame rate before a shooting instruction (full pressing of the shutter button). That is, the camera body 100 is configured to periodically receive lens data corresponding to the shooting environment while displaying a through image.

  In step S109, the body control unit 103 performs correction processing on the captured image (through image) using the lens data received immediately before, and returns to step S104. By repeating the processes in steps S104 to S109, it is possible to display the through image on which the correction process suitable for the shooting environment is always performed on the display device 111 in the shooting mode.

  In addition, when the shutter button is fully pressed, the body control unit 103 performs correction processing on the captured image using the lens data received immediately before, and the captured image after the correction processing is not illustrated. Record in the recording unit. As a result, a captured image on which correction processing suitable for the shooting environment has been performed can be recorded.

  As described above, when the amphibious lens 200 having the function of converting the land lens data into the underwater lens data is attached, the camera body 100 transmits the underwater lens data to the amphibious lens 200 when it is underwater. When it is on land, it requests land lens data from the amphibious lens 200. When the underwater lens data is requested from the camera body 100, the amphibious lens 200 converts the land lens data into underwater lens data and transmits it. When the land lens data is requested from the camera body 100, Transmit land lens data.

(Communication between land-based lens and camera body)
FIG. 5 is a flowchart for explaining processing in which the land-only lens 300 and the camera body 100 communicate lens data. The processing executed by the body control unit 103 of the camera body 100 is shown on the left side of FIG. 5, and the processing executed by the lens control unit 203 of the land-only lens 300 is shown on the right side of FIG.

  In FIG. 5, the processing of steps S111 to S112 and steps S301 to S302 is the same as the lens type data communication (steps S101 to S102 and steps S201 to S202) in FIG.

  In step S113, the body control unit 103 determines whether the interchangeable lens currently mounted is the amphibious lens 200 or the land-only lens 300 based on the received lens type data. Here, since the case where the land-only lens 300 is mounted has been described, the body control unit 103 determines that the land-only lens 300 is currently mounted, and proceeds to step S114.

  In step S <b> 114, the body control unit 103 requests land lens data from the land-only lens 300 via the body-side first communication unit 117.

  In step S <b> 303, the lens control unit 203 determines whether land lens data is requested from the camera body 100. If the land lens data is requested, the lens control unit 203 proceeds to step S304.

  In the land-only lens 300 of the present embodiment, land lens data corresponding to various lens positions is stored in the ROM 215. In step S <b> 304, the lens control unit 203 reads the land lens data corresponding to the current lens position from the ROM 215 and transmits the data to the camera body 100 via the lens side first communication unit 217. Note that the land-only lens 300 of the present embodiment is an interchangeable lens that is not supposed to be taken underwater, and therefore has no function of converting land-only lens data into underwater lens data.

  In step S115, the body control unit 103 determines whether or not land lens data is received from the land-only lens 300. If the body control unit 103 receives the land lens data, the process proceeds to step S116.

  In step S116, the body control unit 103 determines whether the camera body 100 is in the water based on the detection signal from the underwater sensor 119. If the body control unit 103 determines that the camera body 100 is underwater, the process proceeds to step S117. If the body control unit 103 determines that the camera body 100 is not underwater (ie, is on land), the process proceeds to step S118.

  In step S117, the body control unit 103 converts the received land lens data into underwater lens data using the conversion method described above, and proceeds to step S118.

  The land lens data communication (steps S114 to S115, S303 to S304) is performed each time by command data communication between the camera body 100 and the land-only lens 300 when the camera body 100 is in the shooting mode. That is, the camera body 100 is configured to periodically receive lens data corresponding to the shooting environment while displaying a through image. Further, the determination as to whether or not the camera body 100 is in water in step S116 and the conversion into underwater lens data in step S117 are performed every time immediately after this command data communication.

  In step S118, the body control unit 103 performs correction processing on the captured image (through image) using the lens data acquired immediately before, and returns to step S114. By repeating the processes of steps S114 to S118, it is possible to display on the display device 111 a through image that has been always subjected to the correction process suitable for the shooting environment during the shooting mode.

  In addition, when the shutter button is fully pressed, the body control unit 103 performs correction processing on the captured image using the lens data acquired immediately before, and the captured image after the correction processing is not illustrated. Record in the recording unit. As a result, a captured image on which correction processing suitable for the shooting environment has been performed can be recorded.

  As described above, when the land-based lens 300 that does not have the function of converting land-based lens data into underwater lens data is attached, the camera body 100 can receive the received land-based lens data underwater. Is converted into lens data for use and used for correction processing of the captured image. On the other hand, when the camera body 100 is on land, it uses the received land lens data as it is for the correction processing of the captured image.

According to the embodiment described above, the following operational effects can be obtained.
(1) The amphibious lens 200 includes a lens-side mount 201 to which the camera body 100 is detachably attached, a lens-side first communication unit 217 that communicates with the camera body 100, a ROM 215 that stores land-use lens data, A lens control unit 203 that converts the land lens data into underwater lens data. When the land lens data is requested from the camera body 100, the lens control unit 203 converts the land lens data into the lens side. When the underwater lens data is transmitted from the camera body 100 to the camera body 100 via the first communication unit 217, the underwater lens data is transmitted to the camera body 100 via the lens side first communication unit 217. Send to. Thereby, in the camera body 100, underwater lens data can be used during underwater photography, and land lens data can be used during land photography. Therefore, correction suitable for the shooting environment can be performed on the captured image.

(2) Whether the camera body 100 is in a state where the amphibious lens 200 capable of outputting land lens data and underwater lens data is detachably mounted, and the camera body 100 is in water An underwater sensor 119 for detecting whether or not it is underwater, the body side first communication unit 117 is used to request the amphibious lens 200 for underwater lens data, and the amphibious lens 200 When the underwater lens data is received from the amphibious lens and it is detected that it is not underwater, the amphibious lens 200 is requested of the amphibious lens 200 via the body-side first communication unit 117, and the amphibious lens 200 And a body control unit 103 that receives land lens data. Thereby, the camera body 100 can perform appropriate correction with respect to a captured image in both underwater shooting and land shooting.

(3) The camera body 100 is connected to the land-only lens 300 via the body-side mount 101 to which the land-only lens 300 capable of outputting the land-use lens data is detachably attached and the body-side first communication unit 117. The body control unit 103 that requests land lens data and receives the land lens data from the land-only lens 300, the underwater sensor 119 that detects whether or not the camera body 100 is in water, and underwater And a body control unit 103 that converts the land lens data into underwater lens data suitable for underwater photography. Thereby, the camera body 100 can perform correction suitable for underwater photography on the captured image even when the land-only lens 300 is attached.

(Modification 1)
In the above-described embodiment, the amphibious lens 200 has been described with respect to an example in which when the underwater lens data is requested from the camera body 100, the land lens data stored in the ROM 215 is converted into underwater lens data. However, both the land lens data and the underwater lens data may be stored in advance in the ROM 215 of the amphibious lens 200. In this case, when the underwater lens data is requested from the camera body 100, the lens control unit 203 of the amphibious lens 200 may read out the underwater lens data stored in the ROM 215 and transmit it to the camera body 100.

(Modification 2)
In the above-described embodiment, the amphibious lens 200 has been described with respect to an example in which when the underwater lens data is requested from the camera body 100, the land lens data stored in the ROM 215 is converted into underwater lens data. However, the underwater lens data may be stored in advance in the ROM 215 of the amphibious lens 200 instead of the land lens data.

  When the underwater lens data is requested from the camera body 100, the lens control unit 203 of the amphibious lens 200 in this case reads out the underwater lens data from the ROM 215 and transmits it to the camera body 100. On the other hand, when the land control lens data is requested from the camera body 100, the lens control unit 203 converts the underwater lens data read from the ROM 215 into the land lens data and transmits it to the camera body 100.

(Modification 3)
The above-described camera body 100 may be configured to be attached with an interchangeable lens dedicated to underwater photography (hereinafter also referred to as an underwater lens) that can output only underwater lens data. In this case, the camera body 100 receives the underwater lens data from the underwater lens. When the camera body 100 detects that the vehicle is on land, the camera body 100 converts the received underwater lens data into land lens data and uses it for correction processing of a captured image. On the other hand, when the camera body 100 detects that it is underwater, it uses the received underwater lens data for the correction process of the captured image.

(Modification 4)
In the embodiment described above, an example has been described in which, when the shutter button is fully pressed, an image obtained by performing correction processing on the captured image using the lens data immediately before is recorded in a recording unit (not illustrated). However, when the shutter button is fully pressed, the body control unit 103 may record the pre-correction captured image and the previous lens data in association with each other in the recording unit. By doing so, correction processing can be performed later on the captured image once recorded using lens data suitable for the shooting environment.

(Modification 5)
In the above-described embodiment, the example in which the underwater sensor 119 detects whether or not it is underwater has been described. However, the body control unit 103 of the camera body 100 may determine whether or not the camera body 100 is underwater according to an operation signal from the operation member 120.

  In this case, in the menu setting of the camera body 100, the user can set the underwater shooting mode or the land shooting mode by operating the operation member 120. The body control unit 103 acquires underwater lens data when the underwater shooting mode is set by the operation member 120, and acquires land lens data when the land shooting mode is set by the operation member 120. .

(Modification 6)
In the above-described embodiment, the example in which the underwater sensor 119 is provided in the camera body 100 has been described. However, the amphibious lens 200 may be provided with an underwater sensor. In this case, the lens control unit 203 of the amphibious lens 200 transmits underwater lens data to the camera body 100 when the underwater sensor detects that it is underwater. The lens data is transmitted to the camera body 100.

  In the case of the land-based lens 300, an underwater sensor may be provided in the waterproof housing 400. In this case, the body control unit 103 of the camera body 100 receives a detection signal from the underwater sensor of the waterproof housing 400 and determines whether or not the camera body 100 is underwater.

(Modification 7)
In the above-described embodiment, the example in which the present invention is applied to the camera body 100 having the waterproof function has been described. However, the present invention may be applied to a camera body that can be waterproofed by mounting a waterproof housing. The camera body in this case may be determined to be underwater when the waterproof housing is attached, and may be determined to be land when the waterproof housing is not attached.

(Modification 8)
In the above-described embodiment, the example in which the camera body 100 periodically receives lens data while displaying a through image has been described. However, the camera body 100 may start receiving lens data when the shutter button is half-pressed, or may receive lens data when the shutter button is fully pressed. In addition, the camera body 100 receives both the land lens data and the underwater lens data in the initial communication, stores them in a RAM (not shown), and uses them properly according to the detection signal from the underwater sensor 119. You may do it.

(Modification 9)
The present invention may be applied to a single-lens reflex type camera body. In this case, lens data may be received when the shutter button is fully pressed. Also, in data communication between a single-lens reflex type camera body and an interchangeable lens, steady communication (corresponding to command data communication) and communication having a communication cycle shorter than that of regular communication (corresponding to hotline communication) Is provided, the lens data may be communicated by steady communication.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 100 ... Camera body, 101 ... Body side mount, 103 ... Body control part, 104 ... Imaging device, 117 ... First body side communication part, 119 ... Underwater sensor, 120 ... Operation member, 200 ... Amphibious lens, 201 ... Lens Side mount, 203 ... Lens control unit, 215 ... ROM, 217 ... Lens side first communication unit, 300 ... Land-only lens

Claims (9)

Mounting means for detachably attaching the camera body;
Communication means for communicating with the camera body;
Storage means storing lens data for land photography;
Conversion means for converting the lens data for land photography into lens data for underwater photography;
An interchangeable lens comprising: Mounting means for detachably attaching the camera body;
Communication means for communicating with the camera body;
Storage means storing lens data for land photography and lens data for underwater photography;
An interchangeable lens comprising: The interchangeable lens according to claim 1 or 2,
When the land data for the land photography is requested from the camera body, the communication means transmits the lens data for the land photography to the camera body, and the lens data for the underwater photography from the camera body. When the lens is requested, the lens data for underwater photography is transmitted to the camera body. Mount means on which an interchangeable lens capable of outputting lens data for land photography and lens data for underwater photography is detachably attached,
A discriminating means for discriminating whether it is underwater;
When it is determined that the water is underwater by the determining means, the lens data for underwater shooting is requested from the interchangeable lens, the lens data for underwater shooting is received from the interchangeable lens, and the determining means If it is determined that it is not underwater, communication means for requesting the lens data for land photography from the interchangeable lens and receiving the lens data for land photography from the interchangeable lens;
A camera body characterized by comprising: Mount means to which an interchangeable lens capable of outputting lens data for land photography is detachably attached,
Communication means for requesting the lens data for land photography from the interchangeable lens and receiving the lens data for land photography from the interchangeable lens;
A discriminating means for discriminating whether it is underwater;
A conversion means for converting the lens data for land photography into lens data for underwater photography when the judgment means determines that the water is underwater;
A camera body characterized by comprising: The camera body according to claim 4 or 5,
The camera body according to claim 1, wherein the determination unit includes a detection sensor that detects whether or not the camera body is in water. The camera body according to claim 4 or 5,
An operation member,
The camera body according to claim 1, wherein the determining means determines whether or not the vehicle is underwater based on an operation signal from the operation member. The camera body according to any one of claims 4 to 7,
Imaging means for capturing a subject image;
When it is determined that the image is underwater by the determining means, the captured image captured by the image capturing means is corrected using the lens data for underwater photography, and the image is not underwater by the determining means. If determined, correction means for performing correction processing on the captured image using the lens data for land photography,
A camera body characterized by further comprising: The camera body according to any one of claims 4 to 7,
Imaging means for capturing a subject image;
When it is determined that the water is underwater by the determining means, the captured image captured by the imaging means and the lens data for underwater photographing are associated with each other and recorded in the recording means, and are not underwater by the determining means. If determined, a recording control unit that records the captured image and the land photographing lens data in association with the recording unit;
A camera body characterized by further comprising:

Images