The bw 86mm skylight kr 15 mrc filter is a general use filter with a slight pink tint to help improve overall colour accuracy and clarity the light pink colouration helps to reduce the overall bluish cast of daylight and is especially effective when photographing landscapes and in shade the sky 1a filter is also useful as a general protective filter to leave on lenses at all times filters help to reduce dust and moisture from reaching your lens element and provide additional protection in c