The filter was provided to me free of charge via Vine to test. I was already using the 72mm version from another offer, but the two seem to be technically identical. This 58mm filter fits on my smaller Canon RF 28-50. The filter itself does its job and provides a clearer view of reflective surfaces. It rotates without much play but with slight resistance. You can get an LCD TV almost black with it, the effect is strong. I couldn't detect any vignetting with the above lens, the filter is very narrow and therefore the thread is very short. This means that the original Canon cap no longer grips, but K&F supplies one that fits better. There is also a loop included to hang the cap on the lens. The dangling would just annoy me. The price of the K&F filters is reasonable and I am very happy with them for my (amateur) use. Unfortunately, the manufacturer only supplies a filter box that is far too big and doesn't close properly. If you want to "always have it on", that wouldn't matter, but I usually take the filter off. This doesn't affect the function at first, but I don't want to have to clean the filter if necessary. The 72 came with a suitable box. The filter performance and price are good, the missing box is annoying. 4 stars.