The B+W Series 7 Skylight KR-1.5 Filter used primarily in photography, balances daylight giving you a cooler photographic effect.Much of the suitable light comes in the mornings and afternoons, that causes the pictures taken to look warm with a reddish cast Primarily a light balancing filter, this blue filter takes the extra yellow-red-light from daylight and cools them to give a better effectThis skylight filter helps the photographer to shoot images depicting  natural color tones, creating a chilled sensation