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THREE-DIMENSIONAL MOTION PICTURES 139 NATURAL VISION The camera used in the making of Natural Vision Pictures, is really two cameras joined into a single unit. Each of the two camera's photographing onto a seperate 35 mm film stock. Natural Vision uses variable parallax as the basis of their system. The camera's are 35 mm Mitchells so mounted on the base that the objective lens of one camera faces directly the lens of the other camera. Just as though, one of the camera's was taking the picture of the lens of the second camera, situated in between these two lenses is a prism, or mirrors, which splits the light beam, sending into one camera the picture which would normally be seen by the left eye, and the other beam which would be seen by the right eye into the other camera. This prism or mirror, is fitted with micrometer adjustments, so that the beam can be correctly reflected into the proper channel for each camera. There are also controls on the camera which enables the operator to make the fine micrometer adjustments for the parallax correction prior to the photographing of each scene. Other adjustments change the viewing angle of one of the cameras. Each camera is fitted with a single lens, the use of the standard turret and multiple lenses has to be dispensed with, the single lens is changed as needed from time to time, in the making of the picture. It is absolutely essential that the two lenses used at a time, one in each camera, be carefully matched for optical characteristics. The two cameras are fitted with a viewfinder so that the cameraman and other studio personnel can watch the photographing of the picture, while the scene is actually being shot.