Heliopan 77mm KR12 Color Conversion Glass Filter

This Heliopan 77mm KR12 Reddish-Brown Color Conversion Glass Filter allows the use of a tungsten-balanced film in daylight without a strong blue cast.

What do you do when you must take some photos outdoors and all you have left is tungsten film? Using tungsten film in daylight will produce a bluish cast in the photograph. The 85 series of filters will "bring back", i.e. color balance the tones in your images. These yellow filters are used to correct differences in color temperature between the recording medium (film/video) and the light source.