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102
CINEMATOGRAPHIC ANNUAL
Fig. 4 Photographed on regular film.
Fig. 5 Photographed on grey base film.
Huse further points out that "from a technical standpoint the only difference in handling procedure demanded by gray back film is a consideration of the gray base density, which amounts to approximately .20 (63 % T) in measured density after developing, fixing, washing, etc. The sensitometric difference is very slight, amounting only to a displacement to the left of the H and D curve, as compared with a similar test on white base."
Figure 1 illustrates this point, showing for the same emulsion coated on gray base and white base the actual sensitometric difference. Huse explains that as a result of this base density an increase of approximately 1 ]/2 to 2 printer points is necessary. Figures 4 and 5 give an excellent example of what the new anti-halation film achieves. Both were photographed under the same conditions — one on white base, the other on gray base. The illustrations speak for themselves.
The writer has tried in his feeble way to bring out some of the practical points regarding the advancements made by the film makers. The following two articles by Emery Huse and Gordon Chambers of the Eastman Kodak Company and by D. R. White of the DuPont Film Manufacturing Corporation, will deal with the theoretical aspects of the new films.
Kererences:
1. American Cinematographer, May. 1931. page 11.
2. American Cinematographer, June, 193 1. page 13.
3. American Cinematographer, April, 193 1.
lencan i_inematograpner, June, lVil. page li.
ierican Cinematographer, April, 1931. page 17.
ierican Cinematographer, March, 193 1, page 14.
American Cinematographer, July, 1931, page 14. American Cinematographer, July, 1931. page 15. American Cinematographer, July, 1931, page 39.