UV filter is the time-honoured, 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 tool to add protection to the lens against dust, moisture, scratches, and can permanently remain on the lens. The Manfrotto Essential UV Filter 77mm is water repellent, includes 10 layers of coating which provide an anti-reflective surface and allows 99% light transmission. Multi 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 more anti-reflective the filter the higher 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.