Hi all:
For optical formulas borrowed from the Olympus Pen Fx line, note that they
only had to cover a 18 x 24 mm frame. On an OM they are covering a 24 x 36 mm
frame. The bottom line is that on an OM there is more image making demand
being placed on these lenses, outside the originally intended circle of
coverage. A parallel would be fitting a 350 mm f/2.8 Zuiko to a Mamiya M645
(if it works). The edge definition then becomes suspect.
Gary Reese
Las Vegas, NV
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