Patent ID: 7969672

Claim:
A lens device mountable on an imaging device, characterized by comprising: a focus lens; a first focus ring movable between a first position and a second position on an optical axis, having an unlimited rotation range when being located at the first position; a first rotation-angle detection unit that detects a rotation amount of the first focus ring at the first position; a second focus ring coupled to the first focus ring when the first focus ring is located at the second position, having a limited rotation range corresponding to an adjustable range of the focus lens; a second rotation-angle detection unit that detects a rotation amount of the second focus ring; a control unit that outputs to the imaging device at least information about the rotation amount detected by the first rotation-angle detection unit when the first focus ring is located at the first position and outputs to the imaging device at least information about the rotation amount detected by the second rotation-angle detection unit when the first focus ring is located at the second position.