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Author Message   August Tinkerer Username: August Post Number: 13 Registered: 06-2008 Rating: N/A Votes: 0 Posted on Friday, June 13, 2008 - 07:12 am:    I have done it naked-eye, but only with medium format and only when I'm just checking the factory setting instead of doing it from scratch. I agree you would need a loupe or similar to get it exactly right.