have been using Hoya NXT Plus filters until I checked conditions of them and found they already have multiple light scratches all over the surfaces. And I have been extremely careful with them, never used anything other than well-cleaned microfiber and single-use zeiss wipes. They are just too fragile. Digging more about the filter revealed that those Hoya NXT Plus filters are actually very old products and are not as advanced as recent ones. Hoya's current latest flagship filters are HD3 UV filters, but they are about three times more expensive. After some searches I found out my tripod's manufacturer, K&F also makes filters and this seems to be the best version. It is also a bit more cheaper than NXT Plus. From my rather unscientific reflection test, both Hoya NXT Plus and this one are about equal. However the difference is the durability and coatings. I found no scratches and is much easier to clean than Hoya NXT Plus. The surface is much more slippery than Hoya. Only flaw I found is that the filter frame is perhaps too thin and was rather hard to screw in. Be careful when you install the filter otherwise you may damage a front element of the lens.