These are color conversion filters for the use of tungsten type color films in daylight.
85 decreases the color temperature from 5500°K to 3400°K for the use of Type A color films.
Standard
These filters offer both amateur and professional photographers HOYA's famous quality at reasonable prices. They have coatings applied to both surfaces to suppress reflection and increase light transmission. There are a few exceptions in the special effects range which, due to the special materials used in construction, do not have coatings applied.