The B+W Series 8 KR12 Color Conversion Glass filter reduces the effects of daylight blue color on your photographs. It allows the use of tungsten film even in daylight situations without the bluish cast that registers on films and videotapesThis reddish-brown color conversion glass filter provides a high contrast control by balancing the tungsten lightThis KR12 filter is available in different series such as A, B, and C, which can be used in varying temperatures