ZoMei ABS Slim MCND Filter Adjustable Variable ND2-ND400 ND2-N400 Fader with No X Pattern on Images
Amazon.com : K&F Concept 58mm Variable ND2-ND400 ND Lens Filter (1-9 Stops) for Camera Lens, Adjustable Neutral Density Filter with Microfiber Cleaning Cloth : Electronics
Amazon.com : Neewer 77MM ND2-400 ND Filter Fader ND2 to ND400 Neutral Density Filter for DSLR Cameras with 77mm Thread Such as Canon 70-200mm f/2.8L is II USM, Sigma 24mm f/1.4 Art