Title: Piece of junk!!
Review: I was at the beach recently and put this filter (67mm version) on my 70-200 f/4 IS. My images immediately got very very blurry. I took the filter off and everything went back to how it should be. This wasn't subtle: everything was blurred about 10 pixels, at 200 mm. I was totally astonished: I've heard of cheap filters hurting image quality but never seen it myself. I took a bunch of shots with it on, and a bunch off, and got the same thing over & over again. Shutter speed was fast and I was on autofocus, so this wasn't a user or camera issue. No scratches and the surface was clean, and reflections weren't an issue. Reading reviews on Amazon confirms that I'm not the only one with this problem.The filter's well-built, turns well, and comes in a fine case. It *looks* clear and sharp. But in use -- what a piece of junk!
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