Howdy guys! I'm back with more questions... Hopefully nothing too complicated to answer.
In addition to a 70mm film back I'm looking to get a Polaroid back for my RB. Browsing through a few different sites I've found that there is more than one model that will fit the camera. One I've seen is a "Model 2" and the other being an "NPC". What is the major difference between these? Is one of better quality or more revered than the other? Any recommedations!!?