The Skylight 1B filter reduces the excessive bluishness that frequently occurs in outdoor color photography, especially in open shade under a clear, blue sky. This means outstanding outdoor shots with superb color balance and clarity under all conditions. Also keeps skin tones free of colored reflections from nearby objects such as the shade of trees.

Many photographers use the Skylight 1B instead of a UV filter.

The UV filter is often used as a lens protector and left on the lens most of the time - since the light will be travelling through the filter before it gets to your lens you need the highest quality coated filter to ensure as much light as possible passes through your lens.