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Author Message   Nparsons13 Tinkerer Username: Nparsons13 Post Number: 38 Registered: 09-2010 Rating: N/A Votes: 0 Posted on Thursday, August 22, 2013 - 01:38 pm:    I've read in a several places that the front and rear lens elements may need to be adjusted if the front element is replaced, and I've always wondered: When the Curtar and Longar front elements are used, why don't they need the same adjustment? Or do they?