UV filter is the time-honored, multi-functional filter; it blocks UV light from entering the lens and therefore reducing blurring, haziness and blue casting. At the same time, it is a very useful tools to add protection to the lens against dust, moisture, scratches, and can permanently remain on the lens. Manfrotto Advanced UV Filter 77mm filter is water repellent, scratch and oil resistant, includes 12 layers of coating which provide an anti-reflective surface and allows 98.8% light Coating Each Manfrotto filter has been developed with the highest level of precision. The elaborate multi-coating process effectively minimizes reflections and maximizes the light transmission, hence delivering remarkable optical quality. The anti-reflectiveness of filters increases in parallel to the increase in the number of layers of coating. Additionally, as a result of the multi-coated layers, Manfrotto filters ensure a superior level of protection against dust, moisture and scratches. Technical Specifications: Antireflective Coating; Country Of Origin Japan; Diameter 3.03 in; Filter Type UV; Light Transmission 98.8%; Number Of Coating Layers 12; Protective Case; Water Repellent; Weight 0.06 lbs.