The phot r yellow camera lens filter for the gopro hero 4 3 and 3 attaches on to the dive housing of the hero 4 3 and 3 the main use for yellow filters is for intermediate distance shots such as landscapes with large section of blue sky yellow filters are used for landscape contrast and help to provide a natural look and absorb blue 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 ins