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Author Message   Adrian Tinkerer Username: Adrian Post Number: 247 Registered: 08-2006 Rating: N/A Votes: 0 Posted on Thursday, June 04, 2009 - 05:41 am:    I've recently asked Rick about these lenses (I'm currently wrestling with a 20mm), and he's confident that most of them follow a similar construction so his diagram. So you should be able to use that as a basis if you can't find any specific info. Don't try to use the 55mm Micro-Nikkor as a template, though - it's different!