ND Filter Feature is made of optical glass,and the double-sided multilayer coating process can enhance the transmittance and reduce the reflectivity, excellent image quality restoration without distortion ND Filter Feature can be adjusted from ND2 to ND400, Reduces the amount of light reaching the film without affecting the color Knurling technology to prevent hand slip and facilitate disassembly,the matte technology and lace pressing pattern are more exquisite,the front of the mirror frame is threaded,and lenses,lens covers and other accessories can be installed in a superimposed way in strong light to avoid overexposure, a water picture,the application of night scene can better control the shutter speed, in cloudy and can improve the color saturation of the picture and more transparent High quality aluminum alloy frame has high hardness,oxidation resistance and corrosion resistance Product name:Variable ND Filter Frame material:Light aluminum Mirror material:ND2-400 Optical Glass Material: aluminum alloy + optical glass Color:Black Filter specification:58mm Package Contents: 1 x ND Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.