RE: cold temperature reciprocity

I don't know about freezing but a friend of mine used to pressure cook
his film in a chamber of hydrogen which gave him very extended ISO for
no increase in grain. He had a grant to shoot in Antarctica during their
winters with only star light.

--
Pinhole Blender
chris@pinholeblender.com
http://www.pinholeblender.com
> -------- Original Message --------
> Subject: [pinhole-discussion] cold temperature reciprocity
> From: "Earl and Patty Johnson" <earlj@comcast.net>
> Date: Tue, August 17, 2004 4:35 am
> To: pinhole-discussion@spitbite.org
>
> 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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