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Limitations of Infra-Red Motion Picture Photography
By DR. HERBERT MEYER
In reviewing a four months' sales experience since Infra-Red Type B negative was first introduced to the industry, we feel it is our duty to point attention to the limitations possessed by this emulsion type in common with special products. This has already been stressed by Mr. Farciot Edouart in his exhaustive contribution to the February issue of this magazine and from which we quote in part as follows:
It must be clearly and emphatically stated that this new film is by no means a 'Cure AH' for all night shots. It should not be considered the final answer to the making of all types of night effect scenes."
At the time of this writing the new Agfa Infra-Red Type B has been used in many major and independent productions and by numerous cameramen, and thus far the vast majority of reports received has been thoroughly satisfactory and enthusiastic as to the quality obtained.
In some instances, however, the results were found to be disappointing, but in every case occasioning such comment it could be proven that the cause of difficulty was the fact that certain limitations prohibiting the general application of this type or any type of film for night photographs in the daytime had been overlooked.
It must be remembered that the photographing of night effects in the daytime was done before Infra-Red sensitive emulsions were introduced to the industry, or at least adapted for actual use. In the past, panchromatic emulsions sensitive to the red end of the spectrum were exclusively used. The introduction of Infra-Red sensitive emulsions, such as Agfa Type A and B, was successful for the reason that these emulsions extended the scope of this phase of motion picture photography due to their higher sensitivity to red and invisible Infra-Red, making possible stronger filtering and, therefore, enhancing the quality previously obtained by the use of panchromatic films. Many of the limitations, however, of photographing night effects in the daytime by the use of red filters and panchromatic film, which were well-known to the cameramen, must be equally respected when applying Infra-Red sensitive emulsions for the same purpose.
It is perhaps most instructive, in order to clearly analyze the present technical status of night photography in the daytime with its merits and limitations, to briefly state the history of its development.
Before Infra-Red emulsions were available and applied, the medium for photographing night effects consisted of panchromatic emulsions in conjunction with deep-red filters, such as the Wratten 70 and 72, or through a combination green-and-red filter, such as Wratten 56 plus 23A. Panchromatic negative
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