Warming filters that can be used to control the bluish cast in images shot on cloudy days or in open shade. It can also be used simply to warm up a shot or to enrich skin tones. The 81-Two is used to accentuate skin tones for a warmer appearance. For a subject with darker skin tones, the 81-One is more appropriate. Ideal for romantic close-ups, the 81 Series can be combined with softening filters.