As with other 3D projection systems, polarized images are projected onto a metalized screen and then viewed with polarizing glasses. In order to obtain a wide,bright picture, both images are placed on 70 mm film. These over-under images(.661X1.5inch and separated by a bar of .15 inch) are projected with a single lens. By means of mirrors,these images are separated,then polarized and registered on the screen. A novel camera relay-prism* creates the over-under images on the film with the proper orientation. It consists of a matched pair of front objective lenses; each is followed by a field lens, relay lens assembly, and finally a rear penta prism assembly.