Good quality, But It's take background noise.I think It will be better with foam filter

It is a good quality filter at a good price. I would recommend it for any photographer who wants to be creative.

Great quality for the price. I was very scared of not working properly because of the UV voltage. This one works fine, I use 60s per coat and works good.

Good quality, only complaint is that it is not easy to remove from your lenses. This is an inherent problem of the thin filters, but a polarized filter of this kind shall have additional means for removal. Once it is tight on the lenses your fingers can only grab onto the rotating portion of the filter...Glass quality seems fine, didn't get any clarity or focusing issues. The filter provides a good quality contrast as expected.

I've had this lens for nearly 2 years and hardly ever used it until the last few weeks. I use to shoot with a Rebel XTi, but now I'm using a 5D. Pictures taken with the XTi were usually nice, but nothing special. Eventually I got into panoramas using medium format, manual focus lenses and shift adapters, so the 70-200 was put on a back shelf and was only brought out when I began to wonder if I was having trouble focusing my old, used MF lenses.I had a $95 Hoya UV filter on the 70-200 until one day I was comparing its sharpness and image quality on the 5D to a set of 25 year old, medium format, manual focus, East German, Carl Zeiss Jena lenses. The 70-200 could not match the old commie MF lenses until I dumped the UV filter.Then a couple of weeks ago, because so many of my usual haunts are flooded by the Mississippi, I dragged out the 70-200, put a 2X extender on it and started shooting big white egrets in a local park. It doesn't work so well as a bird lens, especially white birds against a green background. Focus wasn't so good. I compared it with the 2X extender to my 300mm Zeiss Jena, manual focus, MF commie lens targeting a monochromatic stone church bell tower from 600 to 700 yards out. The old commie lens bested it.But this Father's Day it took wonderful pictures of family coupled with the 5D, and again today, it took beautifully sharp photos, coupled again with the 5D, but general photography, not big white birds or monochromatic stone work at great distances.If you want to see what this lens can do:1. Ditch any and all filters. High priced UV filters are worse than useless, they significantly degrade image quality and the lens doesn't need nearly the protection every newbee seems to think it needs. If you put one of those on the front of an f/2.8 70-200 you wasted $1000 of the $1600 you paid for the lens.2. Ditch any and all tele-extenders. Getting good shots with an extender is very hit or miss, especially if the target is pretty much monochromatic and/or glaring white and very far away.3. Get a 5D (or 1D) because with the little Canons (anything less than a 5D), you'll never know just how good this lens is. Of course, if you can't afford a 5D or better but plan on getting one some day, it's alright to buy the f/2.8 70-200 now. It'll be there waiting to show you what it can really do when you finally get a camera that can do it justice.

Very good quality filter...price is afordable. Easy install..

It’s amazing, I was struggling with the one I had before this UV machine it’s really good

Good filter. I like that it has adaptable sizes just wish it had 3.75in! Either way good quality K&N product. Pretty much a lifetime filter if you take care of it.