Tiffen 77VND 77MM VARIABLE ND FILTER for Camera lenses
The Tiffen Variable ND Filter is a versatile and flexible tool, affording you the convenience of using several Neutral Density filters all in one. Primarily used as a photographic tool for controlling depth of field and exposure. This filter offers from two to eight stops of light contol and is easily adjusted.  The thin profile ring is only 9mm thick and wider outer optic help to reduce vignetting at wide angles.  A black padded nylon pouch is included to help protect your investment.  This Variable ND is being sought in the video market as well because it is fast, easy to use, small and light-weight, and does not require additional accessories such as a matte box. This filter is desgned to fit lenses with a 77mm filter size.