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I also use this on sony so the M mount adapter was my first guess. But It didn't show that problem with other M mount lens. Besides, I once disassembled the mount ring of the lens and spun it to the opposite direction, then the tilted(misfocused) part of the image was also turned the same direction. Most of all, I can see the misalign between focus ring and front barrel. it might be above 0.1mm
LarsHP wrote:
This, in my experience, is common - at least regarding M mount lenses. I have made it a routine checking for tilt and swing on every lens I get, and many lenses will need some kind of correction. I don't use M cameras, so the adapter could be the problem, but since the correction isn't consistent, at least some of the corrections must be the lenses. We are talking about 0.1mm here, so only the thickness of a piece of paper, but it is enough to show in images, particularly with wide angle lenses.
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