Hoya 77mm Protectors HD
Hoya HD camera filters feature a hardened optical glass that has 4 times the breaking strength in ANSI standardized testing (ANSI Z80.3 : 2001) where steel balls of varying size and weight were dropped from a height of 50 inches onto the glass.
The Hoya HD Camera Filters use a High transparency polarizing film - the same as that used in the latest high definition LCD TV screens. It has 25% higher light transmission than standard polarizing film used in current photographic filters.
Hoya HD Filters are waterproof and feature scratch & stain resistant mult-coating. These Sspecialized coatings are not just water-proof to repel water spots but also hardened to be scratch and stain resistant. Of course these coatings are from HOYA so they greatly reduce reflections off the surface of the glass allowing you to capture more light in your photos.