Tiffen 72mm Graduated 0.6 ND Filter 72CGND6 B&H Photo Video
Tiffen | 72mm Variable Neutral Density Filter | 72VND
Quick Look: Variable ND Filters by Adam Wilt - ProVideo Coalition
Variable ND Filter - 52VND – The Tiffen Company
MQ Group - The [TIFFEN Variable ND filter] is a unique, versatile, and flexible tool, affording you the convenience of using several Neutral Density filters all in one. The Tiffen Variable ND