Amazon.com : 82mm ND Filter - 8 Stops of Light ND Adjustable Neutral Density Variable Fader Filter Lens 82mm Fits Canon EF 24-70mm f/2.8L II USM 82mm Neutral Density Filter, 82 mm
Amazon.com : JJC 82mm ND Filter ND2-2000 VND Variable Neutral Density Fader for Canon EF 24-70mm f2.8L, EF 16-35mm f2.8L, Nikon AF-S 24-70mm f2.8E, Sony FE 24-70mm f2.8 Lens & Other Lenses
Schneider True-Match Vari-ND MKII Variable Neutral Density Filter (82mm)