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This may be a dumb question Eric, but how did ACS check the sharpness of the lens? What type of testing did they use if you were privy to such information.
Not absolutely sure as I know they use manual and digital methods.
But I would have thought using standard Modulation Transfer function charts.
Interestingly, I need to ask them about Chromatic aberration. I am convinced one of my lenses is worse than when I bought it.. with more colour fringing. I haven't knocked it so I don't know if CA can drift??