Hoya 46mm HMC Multi-Coated Skylight 1B Glass Filter - A46SKYGBThis SKYLIGHT 1B filter reduces the excessive bluishness that frequently occurs in outdoor color photography, especially in open shade under a clear, blue sky. The absorption peak is in the range, which corresponds to the film's green spectrum. 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.