The SX-70 is a folding single lens reflex Land Camera first produced by the Polaroid Corporation in 1972. It was the first instant SLR in history, and the first camera to use Polaroid's new integral print film, which developed automatically without the need for intervention from the photographer. This was revolutionary at the time, and a precursor to today's 600 and Spectra films.
The SX-70 has a folding body design, a 4-element 116mm f/8 glass lens, and an automatic exposure system. The camera allows manual focus as close as 10.4 inches (26.4cm), and has a shutter speed range from 1/175s to more than 10 seconds. A variety of models was offered, though all share the same basic design. Later models have an ultrasonic rangefinder autofocusing system known as Sonar. The Model 3 departs from the other models since it isn't a SLR, but instead has the viewfinder cut into the mirror hood.
All models feature an electronically controlled 'flash-bar' socket across the top of the camera, for insertion of a 10-times use flashbulb unit. Polaroid - as well as other companies - made external flash units that plugged into this socket.
As well as the folding SLR model, a variety of non-folding, 'consumer'-type models were released that also used to SX-70 integral film
The front plate can be a pain. So be gentle
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