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EASTMAN SUPERSENSITIVE PANCHROMATIC TYPE TWO MOTION PICTURE FILM
Emery Huse and Gordon A. Chambers*
ON FEBRUARY 5, 1931, the Eastman Kodak Company announced to the motion picture trade in Hollywood, California, their new Super Sensitive Panchromatic Type Two Motion Picture Negative film. Inasmuch as this film exhibits characteristics not hitherto shown in motion picture negative emulsions, it was considered advisable to present some data pertaining to those characteristics. This article is not presented as a complete technical treatise of the characteristics of the Super Sensitive film, its aim being to call attention briefly and simply to the differences this Super Sensitive film exhibits over the present type, of panchromatic films.
As the name, Super Sensitive, implies, this 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 extreme speed was desired, either for color photography, filter shots, or trick work, it was customary to especially treat the film with some type of sensitizing bath. This bath caused a general increase in the emulsion speed and particularly increased the red light speed. However, the hypersensitized film had certain disadvantages such as its cost, its lack of keeping qualities, and its propensity to produce fog. With the Super Sensitive Type Two these disadvantages are entirely overcome. The increased speed of the Super Sensitive film has been accomplished during the course of the emulsion manufacture. It is sufficient to say, therefore, that the Super Sensitive film is not a hypersensitized film. Furthermore, the Super Sensitive film exhibits the same keeping qualities and shows identical physical characteristics as those shown by the present panchromatic films.
A complete study of any type of film emulsion is best accomplished by making both sensitometric and practical camera tests. This article will not deal in any detail with camera tests but will consider in some detail the sensitometric characteristics of the Super Sensitive emulsion as compared with the present type of panchromatic film. The point of major importance in the consideration of the Super Sensitive film pertains to its greatly increased speed. The data obtained sensitometrically can be and have been checked by camera exposures.
Sensitometry involves a study of known values of exposure as related to the amount of silver (density) which these exposures produce upon the film after development. The standard sensitometric curve is therefore one in which is shown the relationship between exposure (expressed logarithmically) and the densities produced. It is from curves of this type that the sensitometric characteristics of the films under investigation have been studied.
*West Coast Division, Motion Picture Film Department, Eastman Kodak Company.
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