Get a warm custom color with your digital camera or digital camcorder at time of capture with the ExpoDisc Digital Warm Balance filter. Just place it before the lens and read and set the white balance before shooting. The Digital Warm Balance Filter is a calibrated, colored diffusion filter with a bias that forces the digital camera to add precise quantities of red and green color to a neutral balance. It helps reduce blue casts. Each ExpoDisc comes with a card recording its exact density and primary color characteristics.