The hoya hd digital uv filter is a multi purpose fine weather filter that absorbs the ultraviolet rays which often makes outdoor photographs hazy and indistinct a multi purpose filter for colour as well as black and white film and digital photography the clear uv filter can also be left on the lens to serve as a permanent lens protector hd digital uv filter main features hd glass ultra clear high transparency optical glass chemically enhanced optical glass is 4x stronger h