For more information and prices - click here UV filters cut haze for sharper black-and-white prints and correct the blues and violets in color prints. They require no compensation or adjustment to exposure and many people leave them in place on the front of the lens permanently to act as protection for the much-more-expensive lens behind it. The L1BC (Skylight) filter differs from the standard L37C (Ultraviolet) in that it adds a slight warmth to the scene and is particularly effective at giving a natural color when shooting in open shade where the light has a tendency to appear "cool. Under regular shooting circumstances the effect is virtually undetectable.