Whether you need a UV filter or not is up to you, but it offers a number of advantages. The most important thing for me is the protection of the lens, unfortunately there is already a scratch on my lens. The filter arrives well packaged in a plastic case with cardboard packaging. You also get a soft cleaning cloth. I already have a UV filter, but it doesn't have a thread for the lens hood, so I didn't use it. The filter from K&F Concept has 2 threads, one side to screw onto the lens, the other side to put on the geli, which I personally like very much, because I always have the geli on, also to protect against bumps or the like. The thread to the lens is a bit stiff and I had to fiddle a bit to unscrew it. Once you have it on, it sits firmly on the lens. The Geli is much easier to screw on and is also very tight. The glass of the filter is clear and without scratches, overall it is very well made. I have the filter in 58 mm on my M.Zuiko 40-150 mm R. So far I have not noticed any loss of quality in the pictures. 4* from me because of the somewhat stiff thread, otherwise you get good protection for your lens here for just under 10 €, which can be replaced easily and cheaply after damage. A lens repair is significantly more expensive.