The Haida ProII Multi-Coating UV Filter is engineered to block harmful UV light, which can often cause unwanted atmospheric haze or a blueish cast in photos, particularly in outdoor or high-altitude settings. The filter also offers protection to your lens from dust, scratches, and other elements without compromising image quality. Its multi-coating design reduces reflections, ensures better light transmission, and helps deliver sharp, high-contrast images. The 86mm size is suitable for lenses with a matching filter thread, often used on larger lenses like wide-angle and telephoto lenses.