On Sat, 14 Oct 2000, Chris Barker wrote:
> But back to IR film: do we agree that it is temperature difference,
> manifested as a difference in radiation wavelengths, that gives IR
> film (or the near-IR consumer films) their distinctive sensitivity?
> ..... or am I still way off the mark?
I wouldn't agree with that at all - otherwise it would work in total
darkness and fog itself if you were to put it in your pocket. What it
picks up is the just-invisible infra red parts of the available light.
There is actually quite a lot of this in sunlight. You don't tend to
see much use of IR film with tungsten light, though, do you? I'd have
thought that would have enough near-ir to make some interesting images.
--
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