just picked this filter up as insurance for the front element of my 70-200 f/2.8 VR lens. I have purchased a few of these in different sizes now, and as long as you are careful not to overtighten them (they are SUPER THIN and not easy to grip tightly) they seem to work as well as the much thicker and more expensive B&W multicoated filters. K&F typically has good quality and these filters are no exception. If you get vignetting with this filter, you'll get it with ANY filter. I've never seen anything thinner. I also like that you get a decent little storage box, and the lens cap is every bit as good as the OEM ones I have. Not sure what you'd need the little lanyard for (at least as far as filters are concerned), but the included microfiber cloth is also appreciated. In the balance between protection and utility, this filter definitely skews toward utility. It will protect my front element from dirt, dust and smudges, but maybe not large mechanical knocks. On the flipside, it's lightweight and is never going to make your image corners dark. If you are truly rough on your gear, you might need a thicker filter to save your lens front element. But if you prize good optical quality and minimal weight, then this filter should be near the top of your list.