Interchangeable lens, camera body, and camera system

A camera body to which is detachably fitted an interchangeable lens that includes a photographic optical system including a plurality of driven members whose driven state changes, comprising:

• a clock signal generation unit that generates a clock signal and transmits it to the interchangeable lens;
• a driven position information reception unit that receives driven position information according to the clock signal from the interchangeable lens via a first information transmission path, the driven position information being related to a position of at least one driven member among the plurality of driven members;
• a type information reception unit that receives type information specifying a type of driven position information that the interchangeable lens is capable of transmitting from the interchangeable lens via a second information transmission path that is different from the first information transmission path;
• a decision unit that decides, for each of the types of driven position information specified by the type information, whether or not the driven position information corresponding to the type is required;
• and
• a specifying information transmission unit that transmits specifying information specifying the type of driven position information that the decision unit has decided are required to the interchangeable lens via the second information transmission path;
• and wherein
• the driven position information reception unit receives the driven position information of the types specified by the specifying information.

A camera system comprising a camera body and an interchangeable lens that is detachably fitted to the camera body, comprising:

• a photographic optical system provided to the interchangeable lens and including a plurality of driven members whose driven state changes;
• a driven position information transmission unit provided to the interchangeable lens that, according to a clock signal output from the camera body, transmits driven position information to the camera body via a first information transmission path, the driven position information being related to a position of at least one driven member among the plurality of driven members;
• a driven position information reception unit provided to the camera body that receives the driven position information from the interchangeable lens via the first information transmission path;
• a type information transmission unit provided to the interchangeable lens that transmits type information to the camera body via a second information transmission path that is different from the first information transmission path, the type information specifying a type of driven position information that can be transmitted by the driven position information transmission means;
• a type information reception unit provided to the camera body that receives the type information from the interchangeable lens via the second information transmission path;
• a decision unit provided to the camera body that decides, for each of the types of driven position information specified by the type information that has been received, whether or not the driven position information corresponding to the type is required;
• a specifying information transmission unit provided to the camera body that transmits specifying information to the interchangeable lens via the second information transmission path, the specifying information specifying the type of driven position information that the decision unit has decided are required;
• and
• a specifying information reception unit provided to the interchangeable lens that receives the specifying information from the camera body via the second information transmission path;
• and wherein
• the driven position information transmission unit transmits the driven position information of the type designated in the specifying information that has been received.

An interchangeable lens that is detachably fitted to a camera body, comprising:

• a photographic optical system including a plurality of driven members whose driven state changes;
• a driven position information transmission unit that transmits driven position information to the camera body via a first transmission unit according to a clock signal of a first frequency, input from the camera body, the driven position information being related to a position of at least one driven member among the plurality of driven members;
• and
• a type information transmission unit that transmits type information to the camera body via a second transmission unit that is different from the first transmission unit, according to a clock signal of a second frequency that is different from the first frequency, input from the camera body, the type information specifying a type of the driven member of which driven position information can be transmitted from the driven position information transmission unit.