The Lee SW150 Neutral Density (ND) Grad Very Hard Filter Set contains three 150 x 170mm graduated resin filters (0.3, 0.6 and 0.9) that enable the photographer to adjust exposure (by 1, 2, and 3 stops) over part of the photograph without affecting the colour balance. The Very Hard ND is perfect for scenes such as seascapes that feature a defined horizon line. The transition between the coated and clear sections of the filter is extremely sharp, allowing for precision separation between the filtered and unfiltered areas of the frame. A Lee SW150 Filter Holder and Adapter Ring are required, not included.