Polaroid Optics 52mm Neutral Density Camera Filter ND 0.9 - PLFILND952 | eBay
Polaroid Originals Color 600 Film with 2 Neutral Density Filters for Sale in Cypress, CA - OfferUp
Amazon.com : Polaroid Optics 52mm Neutral Density Filter [ND 0.6] Compatible w/ All Popular Camera Lens Models : Camera Lens Neutral Density Filters : Electronics
Polaroid Optics 55mm Variable Range Neutral Density ND Fader Lens Filter - Newegg.com
Handmade ND Filter for SX-70 Cameras Use Polaroid 600 Film - Etsy