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Forum: Film SLRs and Compact Film Cameras
11-13-2011, 09:01 AM
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The effect is caused by light hitting the emulsion but also scattering off the main body of the film base and going back through the emulsion again. A very bright highlight can have vastly more brightness than the bright parts of the scene, think of reflections of the sun. A digital sensor photosite just maxes out so there is no 'spreading' of the highlight to independent adjacent sites.
It would happen with all films but nearly all of them have a layer behind the emulsion that absorbs the light. Infrared wavelengths in particular aren't absorbed by many of the normal materials and the light tends to 'spread' around the highlights. With HIE you can expose the whole film by rewinding and opening the back of the camera - the light will enter the end of the film and bounce all the way down it (a bit like in an optical fibre). Maybe PanF+ has a weaker anti-halation layer than some - due to its nature it may also be a much thinner emulsion. Perhaps PanF+ is more sensitive to IR as well.
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Forum: Film SLRs and Compact Film Cameras
11-13-2011, 04:22 AM
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Yes, the halation on HIE is the thing that can't really be reproduced digitally, the effect comes from the very brightest highlights. Just adding glow in digital doesn't get there since the dynamic range has gone. This one is the Rokkor 24mm, HIE, developed in HC110 dilution B.
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Forum: Film SLRs and Compact Film Cameras
10-20-2011, 02:34 AM
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In spite of doing a lot of infrared work with digital (converted and unconverted Pentaxes) I haven't managed to really capture the look of IR film. These were on a Minolta X700 with a 24mm Rokkor and a Wratten 25 filter, on the now-discontinued Kodak High Speed Infrared film (HIE).
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