Patent ID: 9588404
Date: 2017-03-07
CPC Classifications: G02B,G03B,H04N

Claim:
1. An operation apparatus, which is mountable and dismountable to and from a lens apparatus comprising an optical element that is movable, the operation apparatus comprising: a first detector that detects a position signal corresponding to a position of the optical element in a state in which the operation apparatus is mounted to the lens apparatus; a reference memory that stores a reference position signal, which is a position signal at a time when the optical element is located at a reference position, in the state in which the operation apparatus is mounted to the lens apparatus; a determiner that determines whether or not the operation apparatus is dismounted from the lens apparatus after the reference position signal is stored; a controller that switches between a case where the operation apparatus operates in an adjustment mode in which the reference position signal is stored in the reference memory and a case where the operation apparatus operates in a normal mode in which the reference position signal is not stored, the controller further controlling the operation apparatus to operate in the adjustment mode when the determiner determines that the operation apparatus is dismounted from the lens apparatus after the reference position signal is stored; and a deriver that derives a position of the optical element based on the position signal and the reference position signal, wherein, when the operation apparatus operates in the normal mode, the position of the optical element is derived with use of the deriver.