Optical device with bayonet mount and position restriction means

摘要

Optical devices such as a camera body and an interchangeable lens coupled to complementary optical devices by a bayonet coupling allow interchange of the complementary optical devices independently of whether or not the type of position restriction thereof matches with that of the complementary optical devices. In an embodiment of a camera body, both a radially inwardly operating type position restricting member and an optical axis direction operating type position restricting member are provided together with a position restriction release button. The camera body is also provided with a mechanism which gives priority to the optical axis direction operating type position restriction over the radially inwardly operating type position restriction when an interchangeable lens which includes both a position restriction recess for the radially inwardly operating type position restriction and a position restriction recess for the optical axis direction operating type position restriction is coupled to the camera body.