Polaroid Optics 58mm Variable Range ND2-ND2000 Neutral Density (ND) Fader Filter - Walmart.com
Polaroid Neutral Density Camera Lens Filter for sale | eBay
Polaroid Optics 72mm Neutral Density Filter [ND 0.9] Compatible W/ All Popular Camera Lens Models - Walmart.com
Amazon.com : Polaroid Optics 40.5mm Multi-Coated Variable Range [ND3, ND6, ND9, ND16, ND32, ND400] Neutral Density Fader Filter ND2-ND400- Compatible w/ All Popular Camera Lens Models : Camera Lens Neutral Density Filters :
Polaroid Originals ND Filter for SX-70 Cameras (2-Pack) 004741