Due to its light pink color a 1b reduces the bluish cast of daylight and produces a pleasing warmer picture tone wise initial investments they help protect your lens from dust moisture and scratches which can lead to costly repairs if desired they can be left on at all times for protection skylight filters provide additional benefits of correction for ultravioletuv light which can register on film and videotape as a bluish cast and can obscure distant details also used to reduce the