Polaroid 636 User Manual

11. The camera determines whether the subject is NEAR or FAR by measuring the amount of
light reflected back to the photocell 2 milliseconds after the flash has fired (76 ms into the
exposure sequence). If the measurement is more than 50% of the total needed for a proper
exposure, the camera decides the subject is NEAR. If the subject is NEAR, the electronics
sets the clock to time-out at 124 ms.
12. In a low-light NEAR picture, the blades open partially so that the photocell is measuring
infrared light through the infrared filter. The flash is quenched and the shutter blades
closed either when the photocell sees 100% of the light needed for a proper exposure or
when the internal clock reaches 124 ms.
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Polaroid 636 Specifications

General

Film Format	600 Film
Lens	Fixed focus plastic lens
Focus Range	1.2m to infinity
Shutter	Electronic shutter
Flash	Built-in flash
Viewfinder	Optical viewfinder
Battery	Integral to the film pack