Imaging system and camera body
An imaging system includes an interchangeable lens and a camera body. The camera body includes a second communication unit capable of communicating with a first communication unit, an imaging element operable to generate an image signal from the optical image, and a main body controller operable to transmit a reference signal for providing a reference of a driving start timing of the focus lens to the lens controller through the second and first communication units. The main body controller transmits the reference signal to the lens controller during a period for which neither communication of predetermined signals other than the reference signal nor process related to the communication is performed between the first communication unit and the second communication unit.
1. An imaging system comprising an interchangeable lens and a camera body,
the interchangeable lens comprising:
an optical system that includes a focus lens capable of moving backward and forward in an optical axis direction, and is operable to generate an optical image of an object,
a first communication unit; and
a lens controller operable to control drive of the focus lens; and
the camera body comprising:
a second communication unit capable of communicating with the first communication unit;
an imaging element operable to generate an image signal from the optical image, and
a main body controller operable to transmit a reference signal for providing a reference of a driving start timing of the focus lens to the lens controller through the second communication unit and the first communication unit,
wherein the main body controller transmits the reference signal to the lens controller during a period for which neither communication of predetermined signals other than the reference signal nor process related to the communication is performed between the first communication unit and the second communication unit, and
wherein the lens controller controls the drive of the focus lens based on a timing provided by the reference signal received from the main body controller.
2. The imaging system according to claim 1 , wherein the process related to the communication includes preparation of data to be transmitted, and temporally process of the received data.
3. The imaging system according to claim 1 , wherein the predetermined signals include a command sent from the camera body to the interchangeable lens and a response from the interchangeable lens in reply to the command.
4. A camera body to which an interchangeable lens having a focus lens and a first communication unit is mountable, comprising:
a second communication unit capable of communicating with the first communication unit;
an imaging element operable to generate an image signal from an optical image formed by the interchangeable lens; and
a main body controller operable to output a reference signal for providing a reference of a driving start timing of the focus lens, to the interchangeable lens, through the second and first communication units,
wherein the main body controller outputs the reference signal to the interchangeable lens, so that a period for which communication of predetermined signals other than the reference signal and process related to the communication are performed between the first communication unit and the second communication unit does not overlap a period for which the reference signal is output to the interchangeable lens.
5. The camera body according to claim 4 , wherein the process related to the communication includes preparation of data to be transmitted, and temporally process of the received data.
6. The camera body according to claim 4 , wherein the predetermined signals include a command sent from the camera body to the interchangeable lens and a response from the interchangeable lens in reply to the command.
7. A camera body to which an interchangeable lens having a focus lens and a first communication unit is mountable, comprising:
a second communication unit capable of communicating with the first communication unit;
an imaging element operable to generate an image signal from an optical image formed by the interchangeable lens; and
a main body controller operable to output a reference signal for providing a reference of a driving start timing of the focus lens, to the interchangeable lens, through the second and first communication units,
wherein the main body controller outputs the reference signal to the interchangeable lens, after communication of predetermined signals other than the reference signal and process related to the communication are completed.
8. The camera body according to claim 7 , wherein the process related to the communication includes preparation of data to be transmitted, and temporally process of the received data.
9. The camera body according to claim 7 , wherein the predetermined signals include a command sent from the camera body to the interchangeable lens and a response from the interchangeable lens in reply to the command.