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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 214 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, March 25, 2007 - 07:14 pm:    There's a very good explanation of this on the Web somewhere. Not sure if it will cover your models. Ah, here it is: http://homepages.ihug.co.nz/~Srawhiti/retinafocusmechanism.html