Yes, only as an example of using different lenses for a particular format -- and some reasons to use one over the other. I could have used 40mm vs 60mm lenses for 35mm, just as well. Computar made enlaring lenses for full frame 35mm film from 25mm f2.8 (9 elements in 7 groups) to 65mm f3.5 (6 elements in 4 groups). Of the 25mm (no, it is NOT designed for half-frame), they state:
"The severe illumination fall off, common with most wide angle lenses, is not present with the Computar 25."
But what do they know? They only make enlarging lenses!
I was not trying to suggest using lenses designed for 4x5" with 5x7".
Last edited by xkaes; 17-Sep-2017 at 06:03.
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