Amazon.com : Polaroid Optics 67mm Multi-Coated Neutral Density Fader Filter – Variable Range ND2-ND2000– Holds Optical Quality – Compatible w/ All 37mm DSLR Cameras : Camera Lens Neutral Density Filters : Electronics
Amazon.com : Polaroid Optics 77mm 3-Piece Filter Kit Set [UV,CPL,FLD,& Neutral Density] includes Nylon Carry Case – Compatible w/ All Popular Camera Lens Models : Electronics
SX-70 conversion filter for using 600 film
Polaroid Optics 67mm Neutral Density Filter [ND 0.6] Compatible W/ All Popular Camera Lens Models - Walmart.com