Amazon.com : NiSi 72mm 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
72mm Variable ND2-32 Filter with Cap, Adjustable Neutral Density ND Filter Kit - KENTFAITH