"I don't understand the adapter variability part. I can understand that
the thickness of the adapter might have an influence in the lens's
ability to reach minimum or infinity focus but the test images are all
taken at medium distances."
Chuck Norcutt
I'm not sure I understand the mechanism. There was an especially marked effect
with a N*kon WA. See below and the subsequent pages. Even the center frame
sharpness was affected. Perhaps some are not machined well and are not even
truly flat.
Mike
http://www.16-9.net/lens_tests/15mm_2/sigma1224vnikon15f.html
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