This K&F Concept Nano-X MCUV Filter High Definition/Hydrophobic/ Scratch Resistant with 28-Multi-layer Coatings UV Filter for Camera Lens. The main function of the K&F MCUV filter is to prevent the harmful effect of UV rays and eliminates atmospheric haze that causes a bluish cast and makes distant subjects such as mountains in scenic photos less sharp. By using our UV filters you will be eliminating this and your pictures will be so much sharper and color accurate.