UV filters are often advertised as being able to improve image quality. In my opinion this cannot be determined. This does not make the image more contrasty, sharper or whatever else. On the contrary, even if the filter has high light transmission and is multi-coated, annoying reflections that are visible in the image can still occur through the filter. So if you want the absolute best image quality, you should avoid (UV) filters completely. Nevertheless, I find UV filters practical because they can at least protect one lens from dust, dirt and damage. Even when cleaning a lens, in the worst case scenario you can scratch the glass if, for example, there are fine grains of sand on the surface. Personally, I like to use protective filters, but opinions differ on the subject. The K series from K&F Concept is practically the entry-level series. With 18 layers of Nano MC coating, the filters are already decent, definitely better than uncoated or simply coated filters, but higher-priced filters would also be better coated and therefore even less susceptible to annoying reflections and even more translucent. Basically it's a difference of a few percent. I think the filter is inexpensive considering the quality. I use the 77mm filter with a Canon RF 14-35mm F4 L IS USM.