I took this UV filter from K&F Concept, Nano-X series, to protect my favorite 50 1.8 fixed lens. Unlike other time-tested ones, this one is really super transparent and really very light, so much so that looking at it from the front it almost seems that there is no lens. It is very well made and I really liked that it also comes with a cap of the same diameter and the wrist strap, so as not to lose the cap when shooting. Also included is a small vacuum-packed microfiber cloth: I kept it closed and ready for the first time I have to clean the lenses around, so as to always have a clean cloth.
The structure that holds the lens is made of thin metal, painted black. It reports the filter data on the side and the screw is screwed perfectly on the lens head. It is sold in various sizes, so make sure you choose the right size for your lens. As standard threads, these filters can be used on the lenses of any camera, as long as the lens is the right diameter.
On shots, this filter is really perfect: in practice it is not noticeable and at the same time it protects the objective lens from dust and any scratches.
Really good product, promoted with flying colors for its excellent overall quality and for the fact that it is practically invisible on the photos, without creating strange reflections or plays of light.