The walimex pro ND 8 neutral density filter for videography reduces light intake by 87% or 3 stops with a value of 0.9. This filter allows you to shoot with a wide aperture even in bright sunlight or daylight. It is particularly useful when you want to achieve a blurred background despite a lot of sunlight. With a size of 4 x 4 inches, it fits many matte boxes, including the walimex pro Director II. The filter is simply inserted into the filter slot of the matte box.