LENS INTERCHANGEABLE DIGITAL CAMERA SYSTEM

PROBLEM TO BE SOLVED: To achieve accurate AF operation even if there are time lag or variation resulting from communication or the like between a camera body and an interchangeable lens unit, and a difference in a storage time of each range-finding point of a multi AF sensor. SOLUTION: In the multi AF sensor 15 of the camera body 10, defocus amounts at a plurality of range-finding points in an image plane are detected by a phase difference detection system, a storage synchronization pulse signal synchronizing with a storage period corresponding to the plurality of range-finding points is fed to an interchangeable lens unit 20 side from a camera microcomputer 11 of the camera body through a synchronizing pulse communication path 31, and also a selected point time correction value for the storage synchronization pulse signal is fed according to the storage time at the selected range-finding point out of the plurality of range-finding points to the interchangeable lens unit 20 side from the camera microcomputer 11 through a data communication path 30, then the position of a focus lens 22 corresponding to the storage period of the selected range-finding point by using the defocus amount and the selected point time correction value fed from the camera body, is calculated by a lens microcomputer 21 on the interchangeable lens unit side, and is transmitted to the camera body. COPYRIGHT: (C)2010,JPO&INPIT