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    What to do about my messed up 24-105mm F/4 L IS lens?

    I have an older 24-105mm f/4 L IS (manufactured March 2006, according to the date code). I used it extensively on my 5D over the course of several years, and on my last trip with it in the winter of 2010 the IS mechanism started having problems, it would flutter and buzz intermittently and...