How do I install a neutral density film pack filter? – Polaroid Support
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Polaroid 77mm Neutral Density Fader Filter PLFILFDND77 B&H Photo
Handmade ND Filter for SX-70 | Use Polaroid 600 Film in Your SX-70! | eBay
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