Optimal Moose writes:
<<Weeelll, maybe. It was designed and sold for Pentax 67 lenses. FOV of 200 mm
on 6x7 is about eq. to 95-100 mm on FF. I supposed that FOV/film coverage of
the prime lens would make a difference in the design of a two <<element C-U
lens. That, and the era in which it was made, made me think it might act more
like a C-U lens designed for a FF lens of 100 mm or so.
Hmmm, had thought the original conjecture was the FL of the prime lens was
more important to the CU diopter performance than any FOV/sensor format
considerations.
Suboptimal Mike
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