The Tiffen Variable Neutral Density filter is a versatile & flexible tool providing 2 to 8 stops of light control, affording you the convenience of using several Neutral Density filters all in one. Primarily used as a photographic tool for controlling depth of field & exposure, the Variable ND is being sought in the video market as well because it is fast, easy to use, small, lightweight, & does not require additional accessories such as a matte box.