<p>An optical apparatus includes a zoom optical system including a focus lens unit (9), an operation portion (14) configured to manually and mechanically change a focal length of the zoom optical system, and a controller (16) configured to control the focus lens unit (9) so as to move along a track depending on an object distance in an operation of the operation portion (14). The controller (16) moves the focus lens unit (9) to a second position that is different from a first position that is a position of the focus lens unit (9) in disconnecting a power when a first focal length that is a focal length of the zoom optical system in disconnecting the power is different from a second focal length that is a focal length of the zoom optical system in reconnecting the power.
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