These filters offer both amateur and professional photographers HOYAs famous quality at reasonable prices. They have coatings applied to both surfaces to suppress reflection and increase light transmission.The Hoya 80B is a blue filter designed to balance daylight film under artificial, tungsten or standard (household) incandescent lighting by cooling down the warm colour temperatures associated with these light sources. Multicoated to minimise reflection at the filter surfaces and reduce flare and ghosting. This 80B filter increases colour temperature from 3400 - 5500 degrees Kelvin (commonly used with photoflood lamps)