Polaroid 636 Repair Manual page 22

7. When you open the camera, you can see another obvious difference between the Model 636
and the One Step — a built-in electronic flash. The flash is designed to be used for all
pictures, both indoors and outdoors.
8. The electronic flash features a rapid charge time of about 5 seconds. For outdoor pictures,
the flash is used to provide a proportional fill-flash to eliminate objectionable shadows.
Indoors, the flash provides controlled light for scenes within a 4 to 10-foot range.
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