Amazon.com : NiSi 77mm Swift True Color ND-Vario | 1-5 Stops Variable Neutral Density Filter | Adjustable ND, True-to-Life Color, No Vignetting, Optical Glass with Nano Coating | Photography and Videography : Electronics
JJC 2 in 1 ND Filter & CPL Filter Circular Polarizing Filter Variable ND2-32 Circular Polarizing Filter No X Shadow Ф67mm 72mm 77mm 82mm 49mm 52mm 55mm 58mm 62mm for Canon EOS