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Author Message   Donnie_strickland Tinkerer Username: Donnie_strickland Post Number: 76 Registered: 09-2006 Rating: N/A Votes: 0 Posted on Monday, January 25, 2010 - 06:14 am:    "In my own experience, at least, there is always going to be a considerable focus error; if I set a lens at infinity, then I see a focus error at close distances." That's not the way it works. If you experience this, then there is another fault somewhere.