When I first bought my 70-200 f/2.8 VR I got a Hoya HMC UV Protector filter, figuring it would do just fine... but I wasn't pleased by the level of sharpness with the lens... So the next order I placed I purchased a B&W UV filter, and you can REALLY tell the difference, big time on the two. I did a little test (shooting a decoration on a neighbor's porch), the first shot is an enlargement of a sign blown up to 400 percent with the Hoya filter taken when I got the lens, and the second is with the B&W taken today (the sun was a little different, hence the slightly different brightness levels). The distance and subject were identical. The third shot shows what I blew up the sign from (70mm f/2.8 no VR) This last is the same display shot at today 200mm wide open at f/2.8 1/800 ISO 160... I can finally say I am pleased with the sharpness of this lens (it wasn't the lens at all, it was the dad-gum filter on it that was causing that slight bit of image deterioration).