Standard filter for colour photos in the open air removes haze eg in case of shots at the sea or in high mountain regions avoids blue cast blocks ultraviolet rays up to 365 nm mired value 10 at the same time protection of the lens against scratches dust and finger marks normal coating one layer on each side quality standard glass proclass impact of picture pleasant high contrast colours with warmer character specially for landscape and town shots horizon and subjects which are farer away are s