Cokin z pro 230 skylight resin filter due to its light pink color the cokin skylight 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 it can be left on at all times for protection skylight filters provide additional benefits of correction for ultraviolet uv light which can register on film and videotape as a bluish cast and c