Polaroid HD Multi-Coated Variable Range ND Filter – Foto Köberl – Secondhand
Amazon.com: Polaroid Optics - Filtro de densidad neutra ND2-ND2000 (2.165 in, rango variable de 2.165 in, ND3, ND6, ND9, ND16, ND32, ND400) : Electrónica
Filtro ND hecho a mano para SX-70 | ¡Usa película Polaroid 600 en tu SX-70! | eBay
ND Filter for SX-70 | MiNT Camera
What does a neutral density filter do? – Polaroid Support