Fotga 43mm Slim Fader Variable Adjustable ND2 to ND400 ND Neutral Density Filter Fader ND filter is highly recommended by famous photographers and film directors.You don't have to carry a bunch of filters for shooting. One filter give you from the range ND2 to ND400 Neutral Density (ND) filters can reduce the intensity of light without appreciably changing its color. Traditionally speaking, ND filters have different f-stop reduction numbers and transmittance thus 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. Carry ONLY a single filter with the same capability with ND2, ND4, ND8 and ND400 The Fader ND filter is suggested to use with wide and standard lens to obtain the best performance. Image quality may drop when focal length above 200mm. It may not be suitable for wide angle lens &lt;24mm,35mm film format equivalent