Patent ID: 8545116

Claim:
An interchangeable lens to be removably attached to a camera body, comprising: a first communication unit that is configured to perform data communication with the camera body through a first transmission path; and a second communication unit that is configured to perform data communication with the camera body through a second transmission path that is different from the first transmission path, wherein: the first transmission path includes: a first signal line through which a signal indicating whether or not it is possible to start the data communication through the first transmission path is output to the camera body; a second signal line through which a clock signal is input from the camera body; a third signal line through which a data signal is input from the camera body; and a fourth signal line through which a data signal is output to the camera body; and the second transmission path includes: a fifth signal line through which a signal requesting to start the data communication through the second transmission path is input from the camera body; a sixth signal path through which a signal indicating readiness for the data communication through the second transmission path is output to the camera body; a seventh signal through which a clock signal for the data communication is input from the camera body; and an eighth signal path through which a data signal is output to the camera body.