1、ND Filters Function: The use of ND filters can gain more freedom to control the aperture and shutter, bring more exposure methods and creative space for photography creation, and effectively prevent overexposure. 2、ND Filters Application: ND filters are mostly used to shoot slow door special effects, to obtain the dreamy effect of flowing clouds, water, silk waterfall light trails, flowing ghosts, etc. 3、ND Filter Material: CNC precise machining, extra strong aluminum alloy frame ensures durability and jamming prevention, the lens adopts optical glass, high definition grinding treatment, high definition imaging. 4、Multiple Protection: Adopting multilayer coating technology, the filters have waterproof, scratch proof, oil proof, dustproof performance, easier to cleaning and maintain, can provide better protection for your camera. 5、ND Filter Interface: This ND 1000 filter is compatible with 52mm, 58mm, 67mm lens, the number behind ND represents the ability of the ND filter to block light. Please verify your camera's lens thread size before ordering.