English: An optical printer with two projector heads, used in producing movie special effects. Starting from the left, you can see light shining from the lamp house, then at A is the first projector's film gate, at B a lens that projects the film in A onto the second projector's gate C. At D is the lens of the camera, the camera's finder is at E and the adjustable shutter control at F. In the heavy base G all the electronics needed for controlling the printer are located.