And...we've not even mentioned centering or collimation problems. Where did that come from? Not me... That sort of thing belongs to the lens maker (grinder/polisher), so s/he doesn't introduce such...keith whaley
But it's always surprising to read in many tests that even expensive lenses are not perfectly centered. Does it mean that a (good) repairman could do better (afterwards) than the original lens maker did at the factory?
Andre
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