Century Accessory 67mm Fader ND Filter Adjustable variable ND2 to ND400 Neutral density can be adjusted from ND2 to ND400.It is easy to create different neutral density by rotating the ring Apply slow shutter speed under strong sunlight exposure Large aperture is available to create depth of field easily Suitable for dynamic screen, waterfalls, streams, waves, etc Index marks on the edge of filter for exact adjustment