124 layers of anti light pollution coating, effectively reduce color polarization, restore the true color._x000D_ 2Made of aluminum alloy material, wearresistant and durable, optical glass lens, dustproof and waterproof, wearresistant and scratchproof._x000D_ 3Extend the exposure time, in the bright light environment, let the water, clouds appear fog, dynamic sense._x000D_ 4Adjustable ND lens, reduce the amount of light, reduce shutter speed, extend exposure time, use large aperture._x000D_ 5ND2ND400 can be adjusted to reduce the light lens, from 1 to 8 levels of stepless adjustment, according to the exposure requirements to adjust the gray level, choose different gear to reduce the brightness into the lens. 1 x Camera Lens Filter1 x Storage Box Item Type: Camera Lens FilterRing Color: BlackMaterial: Aluminum Alloy + Optical GlassFilter Type: Medium Gray Density LensNeutral Density Grade: 2-400Lens Compression Spring: Screw-inMain Function: Weaken the Light Through the Lens to Reduce the Exposure