Title: Pay a little extra for one that won't affect sharpness.
Product review: I bought one of these around the time I got my Canon 40D kit with 28-135mm lens. I've had this filter on since day one, but always thought the lens was a little soft in terms of IQ, so I did a test with/without the filter. The results were night and day. I can't tell if it filtering any UV rays, but it certainly filters sharpness dramatically. Skip this one and go for the Hoya.
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