Patent ID: 8400722

Claim:
An interchangeable lens to be detachably attached to a camera body, the interchangeable lens including a holding unit at which a plurality of contacts is arranged, the interchangeable lens comprising: a first communication contact system arranged at the holding unit, including a first contact through which a first clock signal output from the camera body is input, a second contact through which a first data signal output from the camera body in synchronization with the first clock signal is input, a third contact through which a second data signal is output to the camera body in synchronization with the first clock signal, and a fourth contact through which a first asynchronous signal that is asynchronous with the first clock signal is output to the camera body; and a second communication contact system arranged at the holding unit at a position different from a position at which the first communication contact system is arranged, the second communication contact system including a fifth contact through which a second clock signal output from the camera body is input, a sixth contact through which a third data signal is output to the camera body in synchronization with the second clock signal, a seventh contact through which a second asynchronous signal that is asynchronous with the second clock signal is input from the camera body, and an eighth contact through which a third asynchronous signal that is asynchronous with the second clock signal is output to the camera body, wherein: the first through eight contacts are aligned in a line on the holding unit; the fourth contact is arranged at a position closer to the second communication contact system than the first contact, the second contact, and the third contact are, and the seventh contact and the eighth contact are arranged at positions closer to the first communication contact system than the fifth contact and the sixth contact are.