Frame is made of aviationgrade aluminum alloy material, CNC precise processing, anodizing treatment, lettering, easy to install and take, made with highdefinition optical glass, Using the ND16 filter, you can get more DOF to control the aperture and shutter, bring more exposure methods and create space for photography creation, and effectively prevent overexposure. The number behind ND represents the ability of the ND filter to block light. Adopting doublesided multilayer nanometer coating technology, waterproof, scratchproof, and oilproof, the of the lens forms a protective layer similar to the of the leaf, water droplets and oil cannot be absorbed on the surface, and it ND16 filter, suitable for