What makes a bad copy?

Started Sep 3, 2008 | Discussions thread
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Henry Cooksey
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What makes a bad copy?
Sep 3, 2008

We're always hearing about "bad copies" of lenses, but what is it that causes one set of (mostlY) machine cut/polished elements to be so vastly different to another set, and how the sharpness can vary so much?

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