The Roscosun 85 is an amber filter that is used for reducing the color temperature of day light to balance 3200 degree K. The Rosco Cinegel #3401 Filter is produced using the heat-resistant base polymer through deep-dyed technology that gives the best optical clarityIt comes in a size of 20" X 24", and has a transmission rate of 58%This Rosco filter is used for window correction to convert 5500 degree K to 3200 degree KThis filter has been monitored by the on-line computerized calorimetry to be a reliable and consistent product by continuously monitoring its color and density