The Hoya 37mm HMC Skylight 1B Filter reduces the excessive bluishness
that frequently occurs in outdoor colour 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 colour balance and clarity under all conditions. The
Skylight filter also keeps skin tones free of coloured reflections from
nearby objects such as the shade of trees. Because of its minimal colour
change, the Skylight filter can be left on the lens as a protector.