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FOCAL LENGTH SCALE
Fig. 10. The GPLWatson Vari-Focal Lens PA-86 1.
CinemaScope: 76mm. The rapid acceptance of the 35mm CinemaScope system interested at least two companies, Bell & Howell and Vistarama, to the extent that versions of the larger-frame systems were introduced for the 16mm market. Bell & Howell has a projection lens for the 35mm Fox CinemaScope theater projection38 as well as a taking and projection unit for the 16mm version. The Vistarama Corp. lenses, manufactured by the Simpson Optical Mfg. Co., are usable for both film sizes.39
Zoom Lenses. M-G-M announced and demonstrated the Expansa projection lens which is a variable-focal-length lens designed for theater use. With this lens the picture can be fitted in width and height to meet installation requirements and the focal length can be changed while the film is running to vary the size of the projected picture.
Zoomar Corp. announced the intro
duction of the Zoomar 1 6 for the 1 6mm camera. The lever-operated lens and coupled rangefinder have been designed for a focal range of from 1 to 3 in. at a maximum aperture of //2.8.40
Taylor, Taylor & Hobson developed the Varotal zoom lens for use with television cameras, particularly for extreme, long shots of the Coronation.
The GPL-Watson Vari-Focal lens, Model PA-86 1 (Fig. 10), is a zoomtype camera lens for use in conjunction with television or 35mm motion-picture cameras. Focal ranges of 3 to 15 in. and 6 to 30 in. are available, by a replacement of the rear lens element. The focal-length change can be made continuously in controlled intervals varying from 2 to 30 sec.
Miscellaneous. Kern-Paillard introduced their Kern-Yvar-Filten 12.5-mm //2.8 lens for 8mm cameras. This lens is unusual in mechanical construction in
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May 1954 Journal of the SMPTE Vol. 62