The Essential 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 55mm is water repellent, includes 8 layers of coating which provide an anti-reflective surface and allows 99% light transmission. Multilayer 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.