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Title: Cracked!!!
Review: It's not the most clear glass, but it works. However, I bought it for the protection on my Canon 17-40mm lens. It always sounded a little loose and moved easily... then finally it CRACKED. I'm lucky it didn't scratch my new lens. I'm going for the B&W filters from now on. So much for savings, now I'm paying more than I would have if I just did it right the first time!
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