Kase KW100 Wolverine glass square Neutral Density filter ND64000 (16 stop) Light reduction: 16 stops Sizes: 100 x 100 mm Thickness: 2 mm Attachable Gaskets for non-Kase Holders Includes a pouch Almost unbreakable Super waterproof Shock resistant Scratch resistant A Premium Pro glass filter that reduces exposure without affecting colour balance. In photography and optics, a neutral density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colours, of light equally, giving no changes in hue of colour rendition. It can be a colourless (clear) or gray filter, the Kase Filter is a Gray Filter. A Kase Wolverine neutral density filter is used to reduce the light coming into your camera. This can be used to great effect to increase your exposure times for your images, allowing for smooth water or light trails. Long exposure photography can reduce busy streets to empty ones, or to capture movement. ND filters are available in different strengths for different effects.