1、It can gain more freedom to control the aperture and shutter, bring more exposure means and creative space for photography creation, and effectively prevent overexposure. 2、Multi‑layer nano‑coating technology, the lens has waterproof, oil‑proof, anti‑fouling, and anti‑scratch performance to protect the lens from dust and scratches. 3、ND filters are also used to shoot slow‑door special effects, such as flowing clouds/water/silk waterfall light trails/flowing ghosts, etc. 4、Aluminum alloy frame, CNC precision machining, screw thread installation, quick and convenient disassembly and assembly. 5、Number behind ND represents the ability of the ND mirror to block light. Item Type: Lens Material: Aluminum Alloy + Optical Glass 1 x Lens 1 x Storage Box