Patent ID: 8708585

Claim:
An imaging apparatus to which a lens unit can be detachably mounted, comprising: a first terminal and a second terminal for communication with the mounted lens unit; and a control unit configured to perform switching between a first communication mode in which a clock signal is output via the first terminal and communication is performed with the lens unit via the second terminal based on the clock signal and a second communication mode in which communication is performed with the lens unit without outputting the clock signal, wherein the control unit continues the first communication mode if it is determined that the lens unit is not available for the second communication mode, wherein the control unit communicates with the lens unit in the second communication mode at a baud rate determined by the lens unit if it is determined that the lens unit is available for the second communication mode, and wherein the control unit sets the second communication mode after a first signal notifying completion of baud rate settings is received from the lens unit.