I currently run UV filters on my lenses and i spend a lot of time wondering why! This filter is pretty well built with both a front and rear thread which is very helpful, allowing the stacking of filters. For example, a circular polarizer could be put in front, as could an ND. The ring is tough as anything and won't break easily but the glass is far from being super high quality. It doesn't cause too many artifacts at all and any it does are correctable but to be fair you don't even need to do that as the pictures are usable straight out. As always with UV filters though, remember you are adding another piece of glass to the equation so it WILL lower the quality of your pictures even though only slightly. These make great protection filters and have stopped me from damaging lenses a number of times but don't believe the shop keepers and salesmen that say they still have a major optical function! Digital sensors don't really have much UV sensitivity compared to film so its pointless in optical terms. In the end, if you want to protect your filter ring and front element, this is great though but all the coatings still don't stop quality deterioration.