Polaroid 636 Repair Manual page 20

3. One of the major differences between the Model 636 and the OneStep is the type of film it
uses. Like all of the 600 line, the 636 uses a new film format. The film has a speed of 6O0
ASA.
4. On the inner edge of the 600 film pack is a set of molded plastic tabs which interface with
the pack spring in the camera. The two middle tabs press down the ramps of the pack
spring, allowing the film pack to slide over the stop for insertion into the camera. On older
style SX-70 packs there are no tabs. As a result, the pack is prevented from being inserted
into a 600 line camera by the pack spring stop.
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