exposure adjustment for change in enlarger height

[Gerald C Koch]

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.

 

[lensmagic]

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.

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.