Best Buy: Polaroid Optics 72mm HD Multicoated Variable-Range Neutral Density Fader Filter PLFILFDND72
Polaroid Optics 55mm Variable Range Neutral Density ND Fader Lens Filter - Newegg.com
How to make a film pack ND filter for your Polaroid SX-70 – Angie Muldowney
Polaroid Sx70 Lens Set (nd ,closeup, Fisheye Filter) For Model 2 ,sonar Alpha 1,slr690 Slr680 - Film Cameras - AliExpress
Handmade ND Filter for SX-70 Cameras Use Polaroid 600 Film - Etsy
Polaroid Optics 43mm 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 : Electronics - Amazon.com
Polaroid Sx70 Lens Set (nd ,closeup, Fisheye Filter) For Model 2 ,sonar Alpha 1,slr690 Slr680 - Film Cameras - AliExpress