Material: Optical GlassColor: BlackBack Thread Diameter (attach to lens): 67mmFront Thread Diameter (attach additional filter): 72mmQuantity: 1PCSFeatures:Convenient. Don't have to carry many filters for shooting. Carry only a single filter with the same capability with ND2， ND4， ND8 and ND400. Neutral Density (ND) filters can reduce the intensity of light without appreciable change its color.ND filters have different f-stop reduction numbers and transmittance， so generated can be applied for different shooting conditions， such as portraiture， water falls， etc.Slim profile design. Thin filters are essential for avoiding vignetting when shooting at wider angles. Simply rotate the ring of this filter， it offers 2 to 8 stops added density.Apply slow shutter speed under strong sunlight exposure. Large aperture is available to create depth of field easily.Suggested to use with wide and standard lens to get the best performance. Image quality may drop when focal length above 200mm. May not be suitable for wide angle lens <24mm，35mm film format equivalent.Package Content: 1 x 67mm Filter