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I too, have wrestled with this. Fortunately, my current lenses use 77mm, so I am set. I have considered replacing my Canon 16-35 lens with the newer version, and if I do, I will need 82mm filters, which will be quite costly, since I would need at least two new B+W ND filters, a polarizer, and new Lee 82mm wide-angle adapter ring. I suppose that this is simply a part of our hobby- having to upgrade and replace.