Amazon.com : 77mm Variable Neutral Density Filter for Fujinon XF 16-55mm F2.8 R Lens : Electronics
K&F Concept 55mm Neutral Density Filter ND 8 Filter and CPL Circular Polarizing Filter 2 in 1 for Camera Lens Multi-Resistant Coating,Ultra Clear, Waterproof, Scratch-Resistant
58mm Macro Close Up Set + UV CPL ND4 + ND Filter Kit for Canon 18-55mm Lens | eBay
Ultimaxx 55mm ND2 to ND400 Slim Fader Variable Adjustable ND Neutral Density Filter for All DSLR Camera Lens with Same Filter Thread Size - Walmart.com