Fotga 55mm Slim Fader Variable Adjustable ND2 to ND400 ND Neutral Density Filter for Nikon Canon Sony Panasonic Olympus Leica Richo Samsung Fujifilm Dslr Cameras Lens Lenses with 55 mm Thread Material: Optical Glass from Japan Back thread diameter (attach to lens): 55mm Front thread diameter (attach additional filter): 58mm 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 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