Abstract: Lens system for 3-D filming comprises a pair of negative achromatic lenses horizontally spaced substantially on the interpupillary distance. Behind these front lenses, a pair of tilted rhomboid prisms fold the optical paths to be closely positioned one above the other. On these paths, rear lens systems focus the images onto the film plane in upper and lower frame halves. The forward negative achromatic lenses are adjustable fore and aft for focus adjustment, and the rear lens systems are laterally adjustable for convergence control.

Abstract: Dual projection lens systems are housed together to project adjacent stereo images onto a screen in stereoscopic position relationship. An ultra-violet filter is positioned on the optical axis of each lens system, and toward the screen a separate polarizer is positioned on each axis to provide polarized images to be seen by the viewer through binocular-polarized eyepieces. Heat sinks are attached to the filters for removing heat.