The UV filter cuts off unwanted ultraviolet rays, reduces haze and increases clarity. Furthermore, the UV filter serves very well as a protective glass for the lens. HOYA FUSION ONE is a new filter series based on the new HOYA optical technology. It replaces the successful long-selling HOYA PRO1 Digital series, which has been widely used by amateur and professional photographers around the world. The word "ONE" in naming this series is left as a legacy of the HOYA PRO1 Digital, in memory of its contribution to the creativity of photographers, believing that this new series will also continue to serve for many decades to come. HOYA FUSION ONE complements the HOYA filter lineup by merging all the highly regarded basic specifications, such as multi-layer coating, ultra-high light transmission, high quality optical glass and low profile frame, while newly incorporating a dirt and water repellent coating to meet the new standards in the photographic optical accessories industry. Recommended for both amateur and professional photographers. Circular polarizing filters allow photographers to achieve creative, in-camera effects that are not possible once the image is created. A polarizing filter filters unwanted reflections from non-metallic surfaces such as water or glass, as well as light that reflects moisture and pollution in the atmosphere. By rotating the ultra-smooth filter, you can select just the right amount of filtering needed for the creative effect. This results in a bluer sky, greener leaves, reduced or eliminated reflections, and increases the clarity of the final image.