1、Use a wide aperture to lower the depth of field and make the subject stand out from the background. 2、Extend the exposure time, in the bright light environment, let the water, clouds appear fog, dynamic sense. 3、Embossed lens frame, embossed fine lens image, perfect rotation damping, good hand feel. 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. 1 x Camera Lens Filter1 x Storage Box   Item Type: Camera Lens FilterRing Color: BlackWeight: Approx.62g/ 2.2ozMaterial: 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