Interference Filters for Photographic Densitometry

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Abstract
Color filters used in densitometry have usually been made of gelatin and glass combinations. During the past few years interference filters have become available which provide greatly improved densitometry because of their inherently greater stability and narrower pass bands. Tricolor and sound track densitometry can at present be very well accomplished employing Fabry-Perot type filters. Multilayer Fabry-Perot filters may prove to be even superior. Fabry-Perot filters can also be used in a color densitometer to convert it to an abridged spectrophotometer. Excellent near infrared elimination in color densitometers can be accomplished through means of dichroic filters.

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