The Arrow 52mm Color Conversion Filter - 85A will produce natural colors when shooting with tungsten film outdoors. 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. Multicoated to minimize reflection at the filter surfaces which reduces flare and ghosting. *Note: Whereas the 85 series is used for tungsten film under daylight conditions, use the 80 series of filters when using daylight film under tungsten lighting.