Versatile ND Filter. The Moment 72mm Variable ND Filter (6-9 Stop) mounts to lenses with 72mm front filter threads and lets you easily reduce exposure from 6 to 9 stops by simply rotating its outer ring. Its 1.8-2.7 density darkens the entire image, making it perfect for shooting in very bright light. It’s particularly useful for shooting bright snowy days, sunny beach scenes, desert conditions—any situation in which you may want a longer exposure, and it definitely beats carrying around a whole mess of individual ND filters.