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filter. Photographing in a horizontal direction from O toward B, the rays reflected from this portion of the sky must pass throughout atmospheric haze, which causes a much greater amount of blue radiation to become lost by absorption and a correspondingly greater amount of long-wave radiation reflected by the haze to reach the lens. When photographing at any angle to the horizon, for instance in the direction from O to C, correspondingly shorter sections of haze have to be travelled through by rays reflected from the sky and correspondingly more blue evades absorption.
It is also quite difficult and in most cases impossible to render a night-sky effect with any film type and filter combination when photographing with backlight.
These are the principal limitations in applying the technique of photographing night effects in the daytime by means of color corrective filters, regardless of whether Infra Red or panchromatic types are used.
In some instances the above-mentioned grayishness of results obtained when using panchromatic types with a light-red filter plus an underexposure might lead to a desired effect: for instance, if actual moonlight night effects are not desired, but a dawn or twilight-effect is wanted. Infra Red however exposed with appropriate filters would produce such effects just as efficiently as the panchromatic types.
Moonlight Illusion
Naturally, when thinking of an outdoor night effect shot, one imagines, in the majority of cases, "moonlit night effects." The visual illusion of this effect is principally caused through the observance in the projected print of the dark sky, soft but deep shadows and certain carefully spread highlights and catchlights. For this reason a deep shadow in the foreground resulting from a strong cross light is particularly effective. The peculiar effect of Infra Red radiation from green leaves or foliage, and the corresponding photographic rendition on Infra Red film of highlights outlining the shape of trees and tree groups adds a specific beauty which can be overdone, but if properly registered aids the imagination of the observer immensely in realizing a true night effect.
We feel certain that in time every cameraman, director and producer will seriously consider the possibilities offered by the intelligent use of Infra Red type B, particularly the improved quality of photographic results as well as the economic advantages.
A full year's practical experience and testing has truly confirmed and justified the original claim of the manufacturer that this film type is as stable and can be produced in quantities as uniform as any other negative film emulsion. The disappearance of excessive contrast characteristic of former types makes this material applicable to any production use including the most discriminating closeups.
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