====================================
Take another look:
200mm f/5 Zuiko (single-coated)
Vignetting = A
Distortion = slight pincushion
Aperture Center Corner
f/5 B- B-
f/8 B B-
f/11 B+ B
f/16 A- B+
f/22 B+ B
f/32 B B-
====================================
First, you chopped off the next line which reads "Moderately Low Contrast".
Second, the lens isn't very sharp until f/11 as these numbers show. A
lens with moderately low contrast that has to be stopped down to f/11 to
sharpen the corners is not a very good lens. A Tamron 200/3.5 can do better
than this, and the 200/4 Zuiko (which is sharp by f/5.6 and produces images
with high contrast) is much better.
Joseph
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