The phot r red camera lens filter for the gopro hero 4 3 3 attaches on to the dive housing of the hero 4 3 3 the main use for red filters is for dramatic cloudscapes red filters boost black and white contrast and absorbs blues and greens red filters are ideal for use in sunny topical locations with blue or fresh clear water the solid colour filters are designed to enhance natural light with subtle colour wash or bold strong effect the filter snaps into place for quick tool free i