1、Neutral density can be adjusted from ND2 to ND400, reduce amount of colorless light reaching film. 2、When lens focusing length is in super wide angle range and aperture value is F8, if adjust filter to high density for using, relatively obvious "crossing"spot or slight color shift may occur, to insure that image is not disturbed, we suggest you lower filter density value at this point, until disturbing light spot disappears, then shoot normally. 3、Using this filter, more freely control aperture and shutter, bringing more exposure means and creation space for photography creation,effectively preventing overexposure. 4、ND2 reduces exposure by 1 level, ND4 by 2 level,ND8 by 3 level,number after ND represents ability of ND lens to block light, suitable for dynamic screens, waterfalls, streams, waves, etc. 5、Made of high quality materials, sturdy, durable and long service life, easy to carry and store, convenient to use.  1 x Filter    Condition: 100% Brand NewItem Type:Adjustable ND Lens FilterBrand:FOTGAMaterial: Aluminum Alloy + Optical GlassRing Color: RedNeutral Density Rating: 2-400Lens Compression Spring: Screw-In TypeMain Function: Reduce Exposure By Reducing Brightness Of LensOptional Filter Interface Diameter: Approx.46mm/ 1.8in, Approx.49mm/ 1.9inFilter Frame Thickness: Approx.1cm/ 0.4inWeight:Approx.45g/ 1.6oz