Originally Posted by jcc
The Polaroid 405 (aka Fujifilm PA-145) works with 3.35x4.25" packs, not the 4x5" packs. Fujifilm FP-100C (no 45) works with it.
The back that takes 4x5" pack is the Polaroid 550 (or Fujifilm PA-45).
This is correct. I'll edit my earlier posting with apologies for the mis-information.