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Oct., 1931] SUPERSENSITIVE NEGATIVE FlLM 567
emulsion, although this effect is reached indirectly and not as an actual alteration of the emulsion.
Results obtained by making motion pictures with the new film show a marked improvement in sharpness, detail in the highlights, and an over-all improvement of photographic quality. The effects of halation are far-reaching, and a film which avoids these effects should be of the utmost value to the cameraman.
DISCUSSION
MR. MOLS: May not the present film be used for making night shots in the daytime, where light green fields are often encountered as a background? The regular panchromatic film required a great deal of care when making night shots during the daytime due to the fact that there was a tendency for the green to show white. I wonder if in this more sensitive type of negative such a condition might not be corrected.
MR. HUSE: I believe that a great deal of "over-correction" is in reality underexposure. The old type of film was not sufficiently fast, particularly in the red where you needed the speed most when making night shots in the daytime, using deep red filters. But the new film has sufficient speed to permit most satisfactory work of this kind. It is possible to get a much better timed exposure and to do away with any sharp contrast which might appear to be over-correction and which in reality is partial over-correction combined with under-exposure.
MR. PALMER: Will you explain the physical difference between non-halation film and ordinary film?
MR. HUSE: Non-halation film contains a neutral gray dye which prevents halation. This will cause an increase of about 1 to !J/2 printer points in printing; otherwise, there is no change required in the composition nor are any other difficulties found in printing through it. This film was presented to a group of camera and laboratory men last week and all the laboratory men present thought that this feature would not introduce any difficulties whatsoever.
MR. KAINS: Is any special handling of this super-speed film required for use in the tropics?
MR. HUSE: No more precaution is necessary in using the supersensitive film than in using any other type of film. Any type of film will deteriorate under high temperature and high humidity and the physical characteristics of this film are identical to those of any panchromatic film. As a matter of fact, our films are being shot in the tropics, and I heard only the other day that we had some films sent back to us from Europe which were shot in the tropics not more than a month ago.