Amazon.com : K&F Concept 49mm Variable Fader ND2-ND32 ND Filter and CPL Circular Polarizing Filter 2 in 1 for Camera Lens No X Spot Weather Sealed : Electronics
Vivitar VMC 49mm ND-3 Lens Filter USA w/ Plastic Case -- | eBay
FOTGA 49mm Slim Fader Variable ND CAM Filter Neutral Density ND2 to ND400 ND8 for sale online | eBay
49mm ND2-400 (9 Stops) Variable ND Filter Neutral Density Adjustable Filter for Canon Nikon DSLR Cameras - KENTFAITH
B+W 49mm XS-Pro Digital ND Vario MRC-Nano Filter 66-1082203 B&H