Patent ID: 8565591

Claim:
A lens barrel comprising: a fixed portion in which an optical system including a focusing lens is placed; an operation member placed so as to be movable to a first position and a second position along an optical axis of the fixed portion and turnable around the optical axis at each of the first position and the second position; a turning member adapted to turnably engage with the operation member when the operation member moves to the second position, and disengage from the operation member when the operation member moves from the second position to the first position; first detection means adapted to detect a turning position of the turning member when the operation member and the turning member turn in engagement at the second position; second detection means adapted to detect a turning amount and a rotational direction of the operation member when the operation member turns by being disengaged from the turning member after moving to the first position; and moving means placed in the fixed portion and adapted to move the focusing lens along the optical axis based on a computational value obtained by computation using at least an output value from the first or second detection means.