Whether you need a UV filter or not is up to you, but it does offer some advantages. The most important thing for me is protecting 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 for screwing onto the lens, the other side for putting the Geli on, which I personally really like because I always have the Geli on, also to protect against shocks or similar. The thread towards the lens is a bit stiff and I had to fiddle a bit to screw it on. Once you have it on, it sits firmly on the lens. The Geli is much easier to screw on and also sits very firmly. The glass of the filter is clear and without scratches, overall it is very well made. I have the 58 mm filter on my M.Zuiko 40-150 mm R. So far I have not noticed any loss of quality in the images. 4* from me because of the slightly stiff thread, otherwise you can get good protection for your lens for just under €10, which can be easily and cheaply replaced after damage. Repairing a lens is significantly more expensive.