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EASTMAN SUPERSENSITIVE MOTION PICTURE NEGATIVE
FILM*
EMERY HUSE AND GORDON A. CHAMBERS**
Summary. — The advantages which the new super sensitive film has over the present t\pe of film are described, and comparative photographic characteristics of the two types of film are presented. In addition, the paper includes a brief discussion of the particular features involved in the use of the faster film, such as the difference in color sensitivity of the two types, and relative contrast, and the rendering of details in shadows and soft highlights. Users of the new film are cautioned against the danger of processing it when using the present safe lights, on account of the greater speed of the emulsion. The paper concludes with a description of the gray base which has been provided, mainly for the purpose of avoiding halation.
As the name "super sensitive" implies, the new Eastman supersensitive panchromatic type 2 emulsion is extremely fast, but because of its name this new film must in no way be confused with a hypersensitized film. In the past when an emulsion of very high speed was desired for color photography, filter shots, or trick work, it was customary to especially treat the film in some kind of sensitizing bath. This bath caused a general increase of speed, and particularly increased the speed of its reaction toward red light. However, the sensitized film had certain disadvantages, such as its cost, its lack of keeping-qualities, and its propensity to produce fog. In the supersensitive type of emulsion these disadvantages are entirely overcome. The increased speed of the new film is obtained during the course of manufacture. It is sufficient to say, therefore, that the supersensitive film is not a hypersensitized film. Furthermore, it exhibits the same keeping-qualities, and shows identical physical characteristics to those shown by the present panchromatic films.
A complete study of any type of film emulsion is best accomplished by making both sensi tome trie and practical camera tests. This paper will not deal in any way with the camera tests, but will consider in some detail the sensitometric characteristics of the new emulsion
* Presented at the Spring, 1931, Meeting at Hollywood, Calif. ** West Coast Division, Motion Picture Film Dept., Eastman Kodak Co. 560