Amazon.com : Haida 2 in 1 CPL + VND Filter for Camera Pro II Multi-Coating Circular Polarizer + Variable Neutral Density SLR Camera Lens Filter Waterproof Scratch Resistant Nano-Coating Filter 77mm : Electronics
Amazon.com : PROfezzion 77mm Variable ND Filter, ND2-ND2000 [1 to 11 f-Stop] ND Filter for Canon EF 16-35mm f4L /Sigma 24mm f1.4 DG HSM/Nikon AF-S 20mm f1.8G ED Lens/Other Lenses with 77mm
Amazon.com : K&F Concept 77mm Fader ND Filter Neutral Density Variable Filter ND2 to ND32 for Camera Lens NO X Spot,Nanotec,Ultra-Slim,Weather-Sealed : Electronics
Amazon.com : PROfezzion [2 in 1] 77mm 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
Amazon.com : PolarPro 77mm Variable ND Filter (6 to 9 Stops) - Peter McKinnon Edition : Electronics