These cameras were produced 5 years after the introduction of SX-70 cameras in 1977 and used pack film. Although they featured a bellows, and could use both 100 and 80 (square) series film, they were inexpensive cameras which came with plastic lenses, a manual focus system without a rangefinder, and used flash cubes.
These cameras must have been introduced to provide consumers with a newly manufactured pack film camera with a bellows since the older bellows cameras were discontinued. And, although the later "Pro Pack" camera offered an electronic flash, its lack of features made it obvious that Polaroid was pushing its integral film cameras, and throwing pack film users a bone.
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