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specifies the developing conditions, negative gamma, and other vital factors upon which the ratings are based.
Listings are grouped under eleven headings, corresponding to specific uses of the films, each generally employing different processing standards. Many products therefore get multiple listings, and in some cases, show markedly different speeds according to the use and developing methods involved. For ordinary rollfilm service, for example, Agfa Superpan Press is given a daylight speed rating of 100, while under the "Press" grouping, the same emulsion is listed at a speed of 1 25.
The groupings and their development standards include: Rolls and Packs, based on commercial photo-finishing methods, 5 minute development in DK 50; Miniature Camera Films, based on development to a gamma of .8 in the finegrain developer recommended by the manufacturer; Press, based on development to a gamma of 1.2; Portrait, based on a gamma of .9; Commercial, based on a gamma of 1.0; Process, based on a gamma of 3.0; Graphic, based on a gamma of 7.0 with the meter reading taken from a white card and using the "O" position on the calculator; Aero film, using a gamma of 1.2; 35mm. Motion Picture Film, based on a gamma of .8 in a borax developer; 8mm. and 16mm. film ratings are based on the manufacturer's own processing. A number of the ratings are qualified as subject to further test, and will possibly be revised in the near future.
The chart is obtainable free from the Weston Company, or from photographic dealers.
The contract of C. King Charney with C. King Charney, Incorporated, distributors of Agfa Motion Picture Films, the expiration date of which was October 15, 1938, has been amicably terminated.
The name of C. King Charney, Incorporated will be changed to Agfa Raw Film Corporation, and the company will continue its business at its present quarters in Ftollywood at 6424 Santa Monica Boulevard.
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