This is a very good filter. I had a B+W filter that broke when a friend dropped my camera. I decided to try this Canon filter and I am impressed by its performance.

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.

This filter did its job admirably for nine months. After that time, I noticed some film/gunk buildup on the front of it. I took the filter off the lens and used distilled water and a cloth to clean it using very light pressure.

After cleaning it, there were tiny scratches all over the surface of the filter. So cleaning the filter ruined it.

I'll try buying the Hoya filter and see if that holds up better. A product like this certainly shouldn't be scratched into unusabilty the first time you clean it.

I just assumed that Canon would make a top quality haze filter, so I ordered it along w/ my new D40. The camera is great, but the filter was not, so I returned it. A local camera shop pro showed me how inferior it was to the equivalent filter by Hoya, which reflects almost no light, while the Canon reflects a great deal. The Hoya filter costs more than the Canon, but it certainly seems stupid to try to save $30 when you've invested $1000+ on a camera, especially when the filter directly affects the quality of the pictures -- which, after all, is what it's all about.

doesn't seem to make any difference in my outside photos, but i do appreciate the added protection