Variable Neutral Density Filter (ND2-ND400) - Ultimaxx
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
K&F Concept ND2-ND400 Blue Multi-Coated Variable ND KF01.1399