Abstract: A light source for use in exposing photographic material through a negative. The source includes a plurality of lamps, one appropriate to each emulsion layer of the material to be exposed. Each lamp has a reflector projecting a light stream through a dichroic filter which limits the energy of the stream so that it acts on a single layer. The separate streams are then combined into a single stream which is further treated to eliminate rays exceeding a predetermined angle. Cut off blades may be used to terminate the projection of any one or more of the individual streams for certain definite times depending on the desired exposure of each separate emulsion layer.

Abstract: Heretofore multi-image photographic printers capable of making packages of different sized prints up to 11.times.14 inches, have had to incorporate a separate and complete set of objective lens arrays for each negative size to be printed. This discloses a multi-image printer which provides a large number of different sized negative apertures using only one or two sets of primary objective lens arrays in conjunction with multiple secondary optical components, these primary objectives and secondary components are each designed with a residual of aberrations of opposite nature, so that in combination these act to mutually correct each other.

Abstract: Process for making an improved duplicate negative from an original color motion picture negative by using optical color filters with flying spot scanning of the original negative to generate tri-color separation analog video signals. These signals are transmitted through active and/or passive electronic filters, at which stage the signals may be optionally modified. The signals are used to create images on a black and white cathode ray tube. A lens projects these images through optical color filters to create a latent image in each of the three emulsion layers of a color sensitive motion picture film. This process is repeated for each frame of the original negative, after which the exposed film is developed in the conventional way, resulting in a duplicate negative, suitable for use for release printing.

Abstract: My negative illuminating system involves the concentrating of light energy from one or more lamps to form a secondary light source of small area, then passing the light from the secondary light source through an optical system that magnifies the light from the small area source to an enlarged area of illumination sufficient in size to cover a photographic negative that is several times larger than the area of the secondary source. The light stream is also confined generally to the objective lens field of the various lens arrays that are individually inserted into the light stream making photographic prints of different sizes.

Abstract: A method for generating an accurate perspective drawing of an object as it would appear from a freely chosen viewpoint, utilizing only data from conventional plan and elevation drawings, arranged according to a prescribed way. This permits an architect or engineer to obtain one or more perspective views of a project which is in the design stage, using only the elevation and plan drawings, which are required anyway. Its practical application is to use a personal computer to carry out the steps of the process, especially if this method is integrated into an existing 2D CAD system. The geometrical and mathematical steps are such that anyone familiar with the software of such a system can provide a suitable routine to enable a user to employ the method. This method allows a change of viewpoint to be made, by simply entering information defining the new viewpoint.

Abstract: The shutter mechanism includes a blade pivotally mounted intermediate its ends. Nearer one end of the blade is an opening through which the subject is viewed when focusing the camera and through which the picture itself is later taken as the blade swings from one side of the optical axis to the other. Nearer the other end of the blade is a permanent magnet which is cooperable with three electromagnets. Appropriate energization of the electromagnets effects the various blade movements.

Abstract: A special polarizing beam splitting unit is employed in a composite photography system which utilizes an autocollimating screen having the capability of reflecting light with virtually no scatter or dispersion. A projector projects a background subject image onto the autocollimating screen, the image traversing first a path along an axis generally parallel to the plane of the autocollimating or projection screen and then by means of the polarizing beam splitting unit via a path extending along an axis normal to the plane of the projection screen. The subject is positioned between the polarizing beam splitting unit and the projection screen. A source of fill light is directed onto the subject through a washout suppression screen containing a polarizing filter oriented so that its plane of polarization is perpendicular to that of the polarization filter contained in the beam splitting unit. The suppression screen also includes an absorbing filter for attenuating visible blue light.

Abstract: The polarizing beam splitting unit comprises a filter in the form of a layer of polarizing material which passes light in only one plane. This polarizing layer or filter is sandwiched between two transparent glass substrates, one substrate having a reflection-enhancing coating and the other substrate having an anti-reflection coating. In one embodiment the reflection-enhancing coating consists of a single layer of cerium oxide, and in a second embodiment the coating consists of layers of zinc sulphide, magnesium fluoride and silicon dioxide. In both situations the anti-reflection coating consists of magnesium fluoride. The polarizing beam splitting unit is employed in a composite photography system.