Amazon.com : PROfezzion [2 in 1] 82mm ND Filter [ND2-ND32] and CPL Polarizer Polarizing Filter, Variable Neutral Density Adjustable Fader with 5 Hard Stops for Canon/Nikon/Tamron/Sigma Lenses : Electronics
Hoya 77mm Variable ND Filter (0.45 to 2.7 (1.5 to 9 stops) #A-77VDY - Newegg.com