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III. 16-MM FILM AND ITS CHAKACTERISTICS
(6) Master Positive — Fine Grain
Master positive film is a fine-grain positive-type film used to provide a positive aspect image when printed from a dupe negative or from an original negative. Although low resolving power master positive materials are available on the market, they are obsolete ; only fine-grain master positive film should be used. A typical film such as Eastman 5365 will have the following characteristics: a yellow-dyed ''color-blind" positive-type emulsion ; fine-grain ; rated resolving power of 150 lines per millimeter; and quite low photographic speed. Master positive film is customarily developed in a negative-type bath; since the emulsion is inherently a high-contrast "color-blind" positive type responsive only to ultraviolet and blue, it is necessary to develop the film in a negative bath to bring the contrast of the master positive film within practical limits to provide a gamma product of unity when used with the dupe negative. (Theoretically, a gamma product of unity causes no change of contrast of an image regardless of the number of copying steps involved ; this assumes no loss of resolving power in the process.)
Table VIII lists the master positive fine-grain available.
TABLE VIII
Master Positive Film
Manufacturer
Code #
Trade name
AntiBase halation dye
Recommended developing gamma
Lines/ mm rated resolving power
Eastman Kodak
5365
Fine Grain Duplicating Positive
Clear Yellow-dyed emulsion
1.40
150
Release Print Materials (7) Release Positive (Black-and-White) Fine Grain
Release positive is film used to make release prints. ' ' A release print is a composite print made for general distribution and exhibition. . . ."* The film used is a compromise of print quality with laboratory print manufacturing cost; it is not the best quality print that can be made, but rather the best that can be made at a satisfactorily low price. Since both picture and sound appear on a release print, it is also necessary that the quality of neither shall be seriously jeopardized for the sake
* ASA Z22.56-1947, section 3.4.6.