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I'm still relatively new to 35mm photography and am looking into doing infrared photography.
Is it possible to use an Infrared Filter with standard 35mm film; what would the effect be on a long exposure (as is done with digital)? Is IR film absolutely necessary for a 35mm camera or can this do done with the correct filter and standard film?
Thanks for any help.
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Quote: Is IR film absolutely necessary for a 35mm camera
It's been a loooong time Colin but I would say undoubtedly as reciprocity failure is going to ruin the image using standard film and when taking the exposure lengths into account.
I seem to remember that silver halide emulsions are not sensitive to any wavelengths longer than blue, possibly green unless sensitised with a dye. I think that the dyes used for IR film are different and you will need proper IR film and an IR filter. Watch out when focussing. Older lenses used to have separate 'R' focus marks for use with infrared -- it's because of dispersion.
Using standard black and white film with a red filter will darken skies and increase contrast. If you use a green filter it will lighten foliage. A infrared filter on a normal black and white film is unlikely to get any results.
However, you can buy Iford SFX film which is a black and white film that is partly into the infrared zone. Used with a dark red filter, it does give some infrared effect. It is better in sunlit scenes.
Quote: Is IR film absolutely necessary for a 35mm camera or can this do done with the correct filter and standard film?
Yes it is necessary- you need a film that is sensitive to IR
Thanks for all your help. I suppose the answer is no now that digital IR photography is the way forward.
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