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does the infra red radiation vary as much as does the radiation of visible light, but the meter's cell, like the eye, is relatively insensitive to this invisible light. Furthermore, this film may be used for several different purposes, each of which requires individual exposure technique. In the studios, for instance, Agfa Infra-red fiilm is used for making night-effect scenes by daylight. It may be so used by individual miniature-camera users, as well. It may also be used for normal, overcorrected filter effects, or for cutting through extreme haze in landscapes.
In any event, Agfa Infra Red, unlike all previous infra-red-sensitive films, does not require visually opaque filters. All that is necessary is to eliminate
A DRAMATIC FILTERSHOT ON AGFA INFRA-RED
Photographed by Dr. Ernst Schwarz
the blue, violet and ultra-violet to which this film, like any light-sensitive silver compound, is sensitive. Virtually all of its remaining sensitivity is in the red and infra-red, so it is superfluous to filter out the other visible rays. In an emergency almost any deep yellow filter which cuts out all blue and ultra-violet will do, but the best filter to use with Agfa Infra Red Film is a medium-red filter, like the Wratten 23-A. In that case, for night effects, I have found exposures should range between f:4.5 and f:3.5 at 1/25 second under bright sunlight in a Southern California summer. In some instances, still less exposure should be given, depending, of course, upon the subject. Where normal day effects, or extreme haze-cutting are desired rather than night-effects, the exposure should be on the full side.
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