Features: HD Glass: - The filter is manufactured from high density sharp cut UV glass. This hardened optical glass has been chemically enhanced to be 4x stronger. HD Coating: - The filter has an 8-layer multi-coating which is water- and oil-repellent, and scratch- and stain-resistant. The coating also greatly reduces reflections off the surface of the glass allowing you to capture more light in your photos. The coating has been applied at high heat in a furnace so it is bonded to surface of the glass, which makes it extremely durable. HD Frame: - The ultra-thin frame is wide-angle lens compatible, and the glass is mounted with high pressure press technology. Hoya, the world-renowned optical glass manufacturer, presents the innovative HD - High Definition - line of filters offering premium performance in lens protection and image enhancement. This 77mm HD UV filter is a multi-purpose fine-weather filter. It absorbs the ultraviolet rays which often makes outdoor photographs hazy and indistinct. It is suitable for both colour and black and white photography. It also serves as a permanent lens protector. HD UV is Hoya's best quality UV filter!