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Infra Red versus
Panchromatic Types
By DR. HERBERT MEYER, A.S.C.
OUR experience with cameramen using the new Agfa Infra Red type B negative has so far proven that the few disappointments encountered can be definitely traced to a misconception of when Infra Red type B can be successfully applied in making night shots in the daytime and what its actual limitations are.
We do not count herein any case where a cameraman steadfastly gives preference to panchromatic types for the sole reason that he has been accustomed to the use of this type film for a long time and is either afraid to switch to Infra Red or perhaps lacks initiative to bother with a change as long as he believes that results he has so far obtained are "passable."
The latter problem is one which should be of definite concern to the producer whose money finances the production in question. It has been stressed more than once that Infra Red negative as a medium for photographing night effects in the daytime not only enhances the beauty of the results desired, but particularly offers possibilities in economy which cannot be overlooked by any responsible production executive.
Principles of Daylight Night Effects
If it is true, and it has been proven beyond question to be so, that Infra Red type B widens the practical scope of night photography in the daytime, this very fact must mean considerable savings in time and money.
The principles upon which is based the photographic technique of obtaining artificial night effects have neither to do with magic nor are in any way too complicated to be understood and applied by any photographer.
The psychological effect of a night illusion is primarily caused by the rendition of a dark sky. A blue sky in ordinary day photography is reproduced white in the finished print because of the blue sensitivity characteristic of any negative emulsion. To render a blue sky dark, it is only necessary to photograph through a blue-absorbing filter and to print down the negative sufficiently to have the sky portion properly darkened.
Of additional importance is, naturally, the problem of reproducing foreground and action also in tones which suggest an appropriate night effect.
When using a panchromatic type, it is not possible to apply orange or even light-red filters with full exposure as, although they do not transmit blue and
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