Journal of the Society of Motion Picture and Television Engineers (1950-1954)

In the foreign field, Pyral, of Paris, have installed striping equipment in a number of countries to support the use of 16mm magnetic-sound projectors in those countries. Pyral have improved their equipment during the year by the addition of an electromagnetic thickness-measuring device, which enables the operator accurately to control the thickness of the stripe as it is being applied. In Germany, equipment has been installed for striping of CinemaScope film and striping is being done on 16mm film for television recording and on 8mm film for amateur use. Optical Developments The Hanovia Chemical & Mfg. Co. announced the first commercial production of optical-quality fused quartz in the United States. In addition to providing the optical industry with an additional source of fused quartz for use in ultraviolet transmission systems, it is expected that the electronic engineers will make use of this material for ultrasonic delay.32 Rudolf Frerichs announced new optical glasses with good transparency in the infrared. These glasses, which are being developed to a production stage by the Servo Corp. of America, have been previously reported in the literature without benefit of production development.33-3* An inverted telephoto-type wide-angle lens system capable of coverages up to 160° for use in scoring cameras was developed by the Douglas Aircraft Co. and the Wollensak Optical Co. Two versions of this system have been developed, one for 16mm cameras and one for 35mm cameras. While these lenses are not corrected to the degree required for theater-type motion-picture photography, they are entirely adequate for their intended application.35 It is reported that a 165° taking lens has also been developed for use with the ToddAO process, shooting on 65-mm film. 76 mm Stereoscopic. 16 mm stereo photography found increased use in the commercial and amateur fields. Bolex, Nord and Elgeet developed taking and projection lenses. Included in the group of equipment released by Elgeet, for example, were the taking and projection lenses, viewfinder, screen and spectacles. The 13-mm //2.8 lens fits standard 16mm "C" mount cameras, and a pair off/1.6 lenses will fit standard 16mm projectors. CinemaScope: 35mm. The CinemaScope process, which is described in a separate section, required compressing optics on the cameras and expanding optics on the projectors. Numerous companies produced anamorphic cylindrical lenses, most of which behave like a reversed Galilean telescope in the horizontal meridian, halving the focal length of the objective and doubling the field coverage. In the vertical meridian the cylindrical attachment has no power, hence has no effect upon the focal length.36-37 Other companies that developed expansion-compression lenses were the Simpson Optical Mfg. Co. through the Vistarama Corp., Goerz American, Shiga Bros, of Japan, Oude Delft Optical Industries in Delft, Holland, and others. The Delrama optical system for anamorphic projection built by Oude Delft uses two mirrors instead of lenses and is reported to correct the "hollow" horizon and "leaning" skyscraper effects noted with cylindrical projection-lens systems. Taylor, Taylor & Hobson are manufacturing prismatic types as well as cylindrical refractive anamorphic projection lenses. A variable expansion-compression anamorphotic-ratio, prism-type optical attachment for taking and projection is under development by the Tushinsky Bros. The Shiga Bros, are reported to have developed an anamorphic camera lens with a pickup angle of 135° when used with a regular 25-mm lens on a 35mm camera. Daily: Progress Committee Report 347