K&F Concept 77mm ND Fader Variable Neutral Density Adjustable ND Filter ND2 to ND400 for Canon 6D 5D Mark II 5D Mark III for Nikon D610 D700 D800 DSLR Cameras + Lens
Amazon.com : K&F Concept 77mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Neutral Density Filter with 28 Multi-Layer Coatings Waterproof (Nano-X Series) : Electronics
Amazon.co.jp: NEEWER 77mm HD Variable ND Filter ND2-ND32 (1-5 Stop) No X-Cloth, Optical Glass, 30 Layer Nano Coating, Ultra-thin Aluminum Alloy Frame, Water Repellent, Scratch-Resistant, Adjustable Dimming Filter : Electronics