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Dimensions of 16-Mm Film in Exchanges
By A. C. ROBERTSON
A survey has been made of the width, variation in width, and shrinkage of 16-mm film in a number of exchanges. These data are of use to designers of 16-mm equipment in describing the dimensions of film currently being used, and to purchasers of film in giving them some idea of the steadiness characteristics the film might possess.
J. HE PRESENT USE of 16-mm motion picture film as a professional medium requires that it give the best possible picture quality. The film must be manufactured carefully and handled equally carefully in each subsequent step in order to assure optimum performance. When this film is projected for large audiences, the magnification often is greater than that used for 3 5 -mm film; therefore, for equal steadiness, the dimensional requirements are very severe. A new and exacting field of use is that of television broadcasting.
This paper is concerned with the dimensional characteristics of 16-mm film, particularly the width, variation in width, and to some extent, the shrinkage. Variations in width are often connected with comments about lateral unsteadiness of television images in programs us
Presented on October 17, 1951, at the Society's Convention in Hollywood, by A. G. Robertson, Manufacturing Experiments Div., Eastman Kodak Co., Kodak Park Works, Rochester 4, N.Y.
ing motion picture film for their subject matter. More often than not, this trouble is associated with 16-mm film made by slitting 32-mm film after processing. Since it was known in the beginning when Debrie introduced the use of 32-mm film, that the slitting after processing might be inaccurate, 32-mm film was made narrower than two strips of 16-mm films.1 In fact, the first film was 1.252 in. in width and allowed about 0.005 in. for variation in slitting. This allowance was decreased to 0.001 in. later.
The exact magnitude of the slitting irregularities and their effects on the projected image have frequently been discussed, particularly in connection with the choice of the side of the film which is to be used in guiding in the picture aperture. Most of the discussions have been qualitative only, and the purpose of this report is to give as many definite measurements as possible in order to assist the formation of sound judgments in future discussions.
November 1951 Journal of the SMPTE Vol.57
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