B + W 62mm Skylight 1A Slim Mount Wide Angle Multi Coated Glass Filter (KR1.5) Eliminates excess blue in sky, sea, high altitude and flash photography. Absorbes only 1/10th of an f-stop of light; filter factor 1.1 Doubles as a UV filter and can be left on for lens protection. Narrow construction and thin glass to avoid vignetting with today's larger wide angle lenses. Multi coated for flare prevention.