Patent ID: 7864462

Claim:
An interchangeable lens that detachably attaches to a camera body having a body-motor, said interchangeable lens comprising: a single lens drive mechanism that drives a single movable lens group in an optical axis direction; a lens-motor that drives said single movable lens group via said single lens drive mechanism; and a power transmission mechanism that transmits a driving force of said body-motor of the camera body to said single lens drive mechanism of said interchangeable lens, wherein said interchangeable lens is selectively mountable to first and second types of camera bodies, said first type of camera body including a power source capable of supplying electric power to said body-motor and incapable of supplying electric power to said lens-motor, and said second type of camera body including a power source for said lens-motor, and said interchangeable lens further comprises an electric power transfer member that receives a supply of electric power from said power source of said second type of camera body when said interchangeable lens is mounted to said second type of camera body.