OPTICAL APPARATUS AND CAMERA SYSTEM

原文（中国語）

Provided is an optical apparatus comprising: a rotating member configured to allow an optical element to be moved in a direction along an optical axis; a protruding member configured to urge the rotating member in a direction different from a rotating direction of the rotating member; and a detection unit, wherein the rotating member includes a first region, a second region, and a third region set between the first region and the second region in the rotating direction, wherein the rotating member is subjected to a force in the rotating direction when being urged by the protruding member in the third region, and wherein a changing rate of an output of the detection unit is different for each of a first state in which the first region is opposed to the protruding member and a second state in which the second region is opposed to the protruding member.