By far the most important accessory you can buy for your professional camera lens is a high quality filter. B+W filters are valued by professional photographers for their exquisite optical quality and fine multicoatings. B+W is a must have for every pro quality lens.
Due to its light pink color, the KR 1.5 reduces the blue cast of daylight and results in a pleasing, warmer picture tone. At the same time, it blocks ultraviolet light and reduces haze in the scene. It is also known as a skylight filter and, like the UV 010, it may be kept permanently on the lens for protection. Filter factor is approx. 1.1.