An optical-space transmission apparatus for use in communication by using light propagating in a space includes a light-receiving unit, an optical system including a movable mirror and introducing light incident thereon to the light receiving unit with the movable mirror, a controller controlling drive of the movable mirror, and a detecting unit detecting an intensity of the light received in the light-receiving unit. The controller modifies a control characteristic of the movable mirror in accordance with a change in the received-light intensity.

 
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~ 00418