1、24 layers of anti light pollution coating, effectively reduce color polarization, restore the true color. 2、Made of aluminum alloy material, wear‑resistant and durable, optical glass lens, dust‑proof and waterproof, wear‑resistant and scratch‑proof. 3、Extend the exposure time, in the bright light environment, let the water, clouds appear fog, dynamic sense. 4、Adjustable ND lens, reduce the amount of light, reduce shutter speed, extend exposure time, use large aperture. 5、ND2‑ND400 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. Item Type: Camera Lens Filter Ring Color: Black Material: Aluminum Alloy + Optical Glass Filter Type: Medium Gray Density Lens Neutral Density Grade: 2-400 Lens Compression Spring: Screw-in Main Function: Weaken the Light Through the Lens to Reduce the Exposure 1 x Camera Lens Filter 1 x Storage Box