Photographing or playback-device

In a photographing- or playback- device for a continuous photo picture carrier which is moved along a guide track by means of a drive device, particularly for motion picture film, with an optical imaging system and at least one mirrored surface which is movable about a mirror axis, particularly a polygonal set of mirrors for the optical equalization of the image migration as well as a light source if necessary, the improvement further comprising

• a partially-mirrored surface disposed in the optical path between the guide track of the picture carrier and the at least one mirrored surface, a ray axis being defined runing between the guide track and said at least one mirrored surface,
• said partially-mirrored surface is inclined relative to the optical path and forms a part of an autocollimation system, the latter including the optical imaging system,
• said partially-mirrored surface constituting means for deflecting a part of the rays,
• the axis of the optical imaging system being transverse relative to the ray axis and running to, and respectively from, said partially-mirrored surface,
• the mirror axis of the at least one mirrored surface being aligned with said ray axis.