Thanks Francois, very nice! I knew the reason for the number of shots in the packs, but then I'm one of the original Impossible Pioneers (still got my black metal member card). One thing I learnt from this video is that two identical Polaroid cameras; let's say two Supercolor 635CL, can produce slightly different shots due to the pressure of the rollers. Obviously the layer of developer will be thicker or thinner due to this pressure, maybe that's why you sometimes see shots that are not properly developed at the top. Really complicated process to make these films!