From: Ed Stander (glassact@compuserve.com)
Date: 04/10/03-09:48:57 AM Z
Lens checking is easily accomplished by placing the lens (or part of the
lens if too large) in the sample position of a UV spectrophotometer. Most
chemistry departments have one, so they are easy to find. As for exposure
times, my results were following the law of inverse squares pretty closely
- a 2x enlargement required 4x the exposure of a contact print. Best - Ed
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