Patent ID: 8493498

Claim:
An imaging apparatus system comprising an interchangeable lens and a camera body, the interchangeable lens comprising: an optical system configured to generate an optical image of a subject; a first communication unit; and a lens controller configured to control driving of the optical system in synchronization with a reference signal received through the first communication unit, the camera body comprising: a second communication unit that can communicate with the first communication unit; and a body controller configured to send the reference signal to the lens controller through the second communication unit and the first communication unit, wherein the body controller, before switching a cycle of the reference signal to another, sends announcement information preliminarily announcing switching of the cycle of the reference signal to another, to the lens controller through the second communication unit and the first communication unit, and the lens controller, when receiving the announcement information, performs a preparation operation for switching the cycle of the reference signal, and when the preparation operation for switching the cycle of the reference signal is completed, the lens controller sends information indicating that switching the cycle of the reference signal is ready, to the body controller through the first communication unit and the second communication unit, and the body controller, after receiving the information indicating that switching the cycle of the reference signal is ready, switches the cycle of the reference signal to another.