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OT:

An enlarger is nothing more than a macro camera. The effective f-stop
is (1+M) x N where M is the magnification and N is the selected aperture.

For a selected aperture and magnification,...

Brian,

I ran a couple of formulas through a spreadsheet to compare different focal
length lenses.

Assuming you print the 56mm x 56mm image area of a 6x6 negative to 16x16",
the...