The 30.5mm 81B Filter from Heliopan controls the bluish coloration that affects daylight film. This is a salmon colored filter that can bring skin tones back to a respectable tone when the light changes during the day. It is especially useful under cloudy or open shade conditions since as the light changes, so does the color temperature. An 81B will decrease the color temperature by approximately 100 degrees Kelvin more than an 81A.
