Hello all:
The recent post regarding math made me wonder if there is a handy formula for determining what adjustment in time is required when moving from one enlarger height to another.
For example, if I have made a good work print at an enlarger height of 7.5 inches (as indicated on the enlarger column)with an exposure of 9 seconds at f 11, what increase in time would be necessary to produce an identical exposure if the enlarger height is increased to 12 inches?
Thus far I've been doing this via test strips, but I'd like to learn a more efficient method.
Regards
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