Eight-Layer Multi-Coating, Waterproof, Scratch/Stain Resistant, Extra Hardened. The Hoya 77mm HD Clear Glass Protection Filter is a wise initial investment. It helps protect your valuable investment from dust moisture and scratches which can lead to costly repairs. This unique filter has been designed to be extra strong against both breakage and water damage - a big benefit when it comes to protecting your expensive optics. It can repel water and is also stain resistant which will permit more light to reach your sensor/film. Multi-coated to minimize reflection at the filter surfaces which reduces flare and ghosting.