Sunlight, daylight, incandescent, flourescent, and other artificial light sources all have color characteristics that vary significantly. Filters give you better images by adjusting for these light variations. Film is rated for a particular color temperature such as that of daylight or tungsten light. Filters are used to correct differences in color temperature between the recording medium and the light source. The 80A filter balances daylight film for use with most standard tungsten lighting, studio lighting and copy stand lighting.