Zykkor 77mm Fader ND Adjustable from ND2 to ND400 Neutral Density Pro Optical Glass Filter (ND2, ND4, ND8, ND16, ND32, up to ND400) Adjustable High Quality Optical Glass Neutral Density Filter ND2 to ND400. Up to 8 Stops Increases control of depth of field Eliminates overly bright, washed-out images. Balances exposures Equally effective in color or black and white photography Includes Filter Case