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Author Message   Dxqcanada Tinkerer Username: Dxqcanada Post Number: 32 Registered: 11-2012 Rating: N/A Votes: 0 Posted on Monday, May 13, 2013 - 06:41 pm:    You should be able to get through to the interior from the rear. You will need a couple of spanning wrenches. http://jelabs.blogspot.ca/2011/04/canon-serenar-f18-50mm-ltm-lens.html