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 ND Filter for SX-70 Cameras (2 Pack) — JZS Camera & Electronics
Amazon.com : Polaroid Optics ND 0.6 Neutral Density Filter For The Nikon D40, D40x, D50, D60, D70, D80, D90, D100, D200, D300, D3, D3S, D700, D3000, D5000, D5100, D3100, D7000 Digital SLR
Optics ND 0.9 Neutral Density Filter For The Canon Digital EOS Rebel SL1 (100D), T5I (700D), T5 (1200D), T4i (650D), T3 (1100D), T3i (600D), T1i (500D), T2i.., By Polaroid,USA - Walmart.com
What does a neutral density filter do? – Polaroid Support
SX-70 conversion filter for using 600 film
The simplest way to use 600 film in Polaroid SX-70 – by attaching a ND filter to the lens | WaLL Photography
Best Buy: Polaroid Optics 52mm HD Multicoated Variable-Range Neutral Density Fader Filter PLFILFDND52
Amazon.com : Polaroid Optics 55mm Multi-Coated Variable Range [ND3, ND6, ND9, ND16, ND32, ND400] Neutral Density Fader Filter ND2-ND2000 - Compatible w/ All Popular Camera Lens Models : Camera Lens Neutral Density