1. Camera apparatus for recording images to be viewed with 3D effect when reproduced and wherein when an image is to be recorded the distance between the lens of the camera and the scene or object to be photographed is set substantially equal to the intended distance between a viewer and a reproduced image of the recorded image during viewing of the reproduced image, said camera apparatus comprising means associated with said lens for recording an image of the scene or object, an opaque mask covering a central portion of said lens, said opaque mask having a long dimension positioned on said lens in a vertical direction relative to said scene or object and a short dimension positioned on said lens in a horizontal direction relative to said scene or object, said long dimension being substantially equal to the diameter of said lens and said short dimension being equal to 21/2 inches divided by the reduction ratio of said lens.