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exposure adjustment for change in enlarger height

Kodak once published a very handy darkroom guide which had a circular calculator that was very handy. You can buy them used at Amazon for less than ten dollars. Well worth the investment.
 
Gerald C Koch said:
Kodak once published a very handy darkroom guide which had a circular calculator that was very handy. You can buy them used at Amazon for less than ten dollars. Well worth the investment.
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That's it! You found it! I have one of the old books here (1988). This is the one I'd been looking for. Many thanks.
 
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