cold temperature reciprocity

Fellow pinholers:

I was showing my pinhole cameras and pictures to a friend recently. To
my surprise, he is interested in astronomical photography. In the
course of our discussion, he told me that cold temperatures reduce the
reciprocity failure effect on photographic film. He said that
astronomers sometimes freeze their cameras and film before an exposure
to reduce the exposure time. It is a little early to think about
pinholing in the snow, but I wonder if my friend is correct, and how
cold does it have to be to make a difference?

Earl Johnson

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Received on Tue Aug 17 04:36:09 2004