A camera system comprising a camera body and an interchangeable lens, wherein the camera body comprises: an imaging unit configured to capture a subject image formed by the interchangeable lens in a predetermined capturing cycle to generate image data; a body controller configured to generate a synchronizing signal having a first cycle correlated with the capturing cycle; and a sending unit configured to send the generated synchronizing signal to the interchangeable lens, the body controller further sending information indicating the first cycle and a second cycle different from the first cycle to the interchangeable lens through the sending unit, the second cycle being correlated with the first cycle, and the interchangeable lens comprises: a focus lens; a drive unit configured to drive the focus lens along an optical axis; a receiving unit configured to receive the synchronizing signal and the information indicating the first and second cycles from the camera body; a lens controller that controls an operation of the interchangeable lens; and a storage unit configured to store, in advance, first cycle information indicating a driving cycle which is supportable by the interchangeable lens and is used for a control different from a minute back and forth driving which minutely moves the focus lens back and forth along the optical axis, and second cycle information indicating a driving cycle which is supportable by the interchangeable lens and is used for the minute back and forth driving, the lens controller being configured to control the drive unit to perform, in the second cycle, the minute back and forth driving, and performing other control in the first cycle in the interchangeable lens than the control of the minute back and forth driving, the body controller being configured to receive the first cycle information and the second cycle information, stored in advance, from the interchangeable lens and to set the second cycle based on the received second cycle information. an imaging unit configured to capture a subject image formed by the interchangeable lens in a predetermined capturing cycle to generate image data; a body controller configured to generate a synchronizing signal having a first cycle correlated with the capturing cycle; and a sending unit configured to send the generated synchronizing signal to the interchangeable lens, the body controller further sending information indicating the first cycle and a second cycle different from the first cycle to the interchangeable lens through the sending unit, the second cycle being correlated with the first cycle, and the interchangeable lens comprises: a focus lens; a drive unit configured to drive the focus lens along an optical axis; a receiving unit configured to receive the synchronizing signal and the information indicating the first and second cycles from the camera body; a lens controller that controls an operation of the interchangeable lens; and a storage unit configured to store, in advance, first cycle information indicating a driving cycle which is supportable by the interchangeable lens and is used for a control different from a minute back and forth driving which minutely moves the focus lens back and forth along the optical axis, and second cycle information indicating a driving cycle which is supportable by the interchangeable lens and is used for the minute back and forth driving, the lens controller being configured to control the drive unit to perform, in the second cycle, the minute back and forth driving, and performing other control in the first cycle in the interchangeable lens than the control of the minute back and forth driving, the body controller being configured to receive the first cycle information and the second cycle information, stored in advance, from the interchangeable lens and to set the second cycle based on the received second cycle information. a focus lens; a drive unit configured to drive the focus lens along an optical axis; a receiving unit configured to receive the synchronizing signal and the information indicating the first and second cycles from the camera body; a lens controller that controls an operation of the interchangeable lens; and a storage unit configured to store, in advance, first cycle information indicating a driving cycle which is supportable by the interchangeable lens and is used for a control different from a minute back and forth driving which minutely moves the focus lens back and forth along the optical axis, and second cycle information indicating a driving cycle which is supportable by the interchangeable lens and is used for the minute back and forth driving, the lens controller being configured to control the drive unit to perform, in the second cycle, the minute back and forth driving, and performing other control in the first cycle in the interchangeable lens than the control of the minute back and forth driving, the body controller being configured to receive the first cycle information and the second cycle information, stored in advance, from the interchangeable lens and to set the second cycle based on the received second cycle information.