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Author Message   Jaywarner Tinkerer Username: Jaywarner Post Number: 1 Registered: 09-2009 Rating: N/A Votes: 0 Posted on Sunday, September 20, 2009 - 08:44 pm:    I'm the guy who "lent" Natew the Mamiya, and I resent that "40 year" bit. More like 30, or 25 years. What was the expiration on the old film it had? As for pulling apart the lens to clean it, I agree with Paul_ron: Keep the pieces associated with the lenses they started with, and remember that positioning of the lens parts will influence the focal length of the lens. And each lens MUST focus at the same focal length.