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Used for photography with infra-red films. Infra-red film is also sensitive to ultra-violet rays and shorter wavelengths ofthe visible spectrum so it is necessary filter out all but the infra-red rays.
Often used in crime detection, medical photography, detection of distibution of vegetation, etc.
In ordinary photography with infra-red film or infra-red colour film, an infra-red filter can also be used to change the contast or colour effect.
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Filter - Factors & F-stops
f-stop = 3, Filter Factor = 8,
Filter - Coating
Standard
Filter - Fitting Type
Screw In
Filter - Thread Size
55mm
Filter - Type of Effect
Black and White Film Contrast