A light weight, compact, stereoscopic apparatus in the form of a lens assembly that can be removably attached to a conventional still motion picture or television camera as an integral unit in place of the normal lens so that a camera may be conveniently converted to three dimensional photography. The lens assembly when used results in superimposed stereoscopic records in color, which superimposed records are of the same size, and when viewed through suitably selected filters are in full relief and color, but when viewed without filters appear as a conventional two-dimensional view.
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1. In combination with a camera that includes a housing on which a lens assembly is removably supported by first means on the exterior thereof to record a two-dimensional of a scene on light sensitive means on the interior of said housing, an apparatus that may replace said lens assembly and transform said camera to one that is capable of recording superimposed left and right hand perspective views of said scene that are of the same size on said light sensitive means and that impart a stereoscopic effect to a user when viewed through suitable filters and that appear as a conventional two-dimensional record when viewed without a filter, said apparatus including: p1 a. first and second lenses of the same focal length that are laterally spaced and lie in a common transverse plane that transmit first and second light rays that represent left and right hand perspective views of said scene;
- b. first and second filter means to control the luminosity of said first and second rays relative to one another;
- c. first and second light transmitting means through which said first and second light rays pass in first and second paths of substantially equal length;
- d. an opaque housing that supports said first and second lenses, first and second filters, and first and second light transmitting means in such relationship that said first and second light rays as they emerge from said first and second light transmitting means provide real left and right hand perspective images of said scene that are super imposed; and
- e. second means on said housing that removably secure said housing to said first means for said real left and right hand perspective images to be projected from said first and second light transmitting means onto said light sensitive means in said camera.
2. An apparatus as defined in claim 1 in which said first light transmitting means includes first and second light transmitting prisms, a layer of silver on the hypotenuse of the first prism to reflect said light rays and change their direction of travel substantially ninety degrees and a semi silver layer on the hypotenuse of said second prism to reflect said second rays and change the direction of travel thereof substantially ninety degrees onto said light sensitive means.
3. An apparatus as defined in claim 2 in which said second light transmitting means includes a parallelogram block having first and second sides and first and second ends of light transmitting material, first and second light reflecting films on said first and second sides, a third prism in abutting contact with said first end, with the hypotenuse of said third prism in abutting contact with the hypotenuse of said second prism, and said second light ray after entering said second end being reflected between said first and second light reflecting films to emerge from said second end and pass through said third and second prisms to said light sensitive means.
4. An apparatus as defined in claim 3 in which the lengths of the paths of said first and second light rays through said first and second light transmitting means are substantially equal.
5. An apparatus as defined in claim 1 which in addition includes:
- f. first and second manually operated adjustment means for moving said first and second lenses longitudinally relative to said light sensitive means.
6. An apparatus as defined in claim 1 which in addition includes:
- f. first manually operated means for moving said first lens laterally relative to said second lens.
7. An apparatus as defined in claim 1 which in addition includes:
- f. first manually operated adjustment means for moving said first and second lenses longitudinally relative to said light sensitive means;
- g. second manually operated means for moving either said first lenses and first filter means or said second lenses and second filter means laterally relative to the other thereof.
8. A method of using said apparatus as defined in claim 7 in which said camera is a television camera that includes a red pick-up tube to provide a compatible two dimensional image when viewed in black and white on said light sensitive means, which method includes the steps of:
- a. manipulating said first and second manually operated adjustment means to reduce interaxial and focal lengths of said first and second lenses; and
- b. utilizing filter means to prevent said red pick up tube contributing to the luminescense information channel.
9. A method as defined in claim 8 in which said camera is a four tube camera, and said filter means is a cyan filter interposed in the luminescense derived light beam, and said method including the additional step of adjusting the tube gain of said camera.