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Author Message   David_nebenzahl Tinkerer Username: David_nebenzahl Post Number: 93 Registered: 12-2009 Rating: N/A Votes: 0 Posted on Monday, January 25, 2010 - 11:52 am:    Scott: I agree that Rick Oleson would be an excellent person to give advice on this problem. I still say that adjusting the focus at infinity is the way to go. The real problem to be solved here is synchronizing the two lenses. Think about it: if you do get both the taking and viewing lenses focused at infinity, they must be in focus at closer distances, because both the lens focal lengths and the distance moved by the focus helix are either identical, or proportional (set by the camera's designer). So there's no need to establish focus at a close distance. I'm sure someone here with more knowledge than I have can explain this better and more authoritatively.