With the same lens, manufacturing will NOT create variation on distortion.
Distortion will be the same unless the design of the lens is change. I
guarantee anyone can see barrel distortion of your Zuiko 50mm non macro if
you have straight lines at the edge of frame. I have shoot a lot of testing
shots for my lenses from 16 to 300mm. No special testing chart, just the
building in front of my flat. Don't check the distorting inside the OM
viewfinder, it has barrel distortion itself.
C.H.Ling
Gary Reese's tests seemed to find a lot of variability in the
distortion of OM 50mm lenses even among different samples of the same
design.
I would think that flatness of field and sharpness/contrast
uniformity over the whole frame would be at least as important.
--
Winsor Crosby
Long Beach, California
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