Lee 100 Graduated ND Very Hard Filter - ND 0.9 (3 Stops)The Lee 100mm Neutral Density (ND) 0. 9 Graduated Very Hard filter enables users to adjust the exposure across the frame by 3 stops, without affecting colour balance. The 100 x 150 mm Very Hard ND grad 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.