An optical apparatus is disclosed which comprises an optical
system provided with a
zoom lens for performing zooming by moving along the
optical axis and a focus lens for performing correction and focusing at the time of zooming, an imaging device for imaging an
optical image supplied from the optical
system, a
zoom actuator for driving the
zoom lens, a focus
actuator for driving the focus lens, a zoom position detecting device for detecting the position of the
zoom lens, a focus position detecting device for detecting the position of the focus lens, an aperture stop member whose opening
diameter changes so as to adjust the
luminous energy passing through the optical
system a filter member to be freely inserted into or extracted from the
optical path of the optical system, an aperture stop state detecting device for detecting the opening state of the aperture stop member, a filter state detecting device for detecting the
insertion state of the filter member, a memory storing the movement information on the relation between the position of the
zoom lens for keeping a focused state and the position of the focus lens, and a control device for correcting the movement information in accordance with an output of the aperture stop state detecting device and an output of the filer state detecting device and controlling driving of the focus lens.