The SX-70 is a folding single lens reflex Land camera which was produced by the Polaroid Corporation from 1972 to 1981.
The SX-70 included many sophisticated design elements. A collapsible SLR required a complex light path for the viewfinder, with three mirrors (including one Fresnel reflector) of unusual, aspheric shapes set at odd angles to create an erect image on the film and an erect aerial image for the viewfinder. Many mechanical parts were precision plastic moldings. The body was made of glass-filled polysulfone, a rigid plastic which was plated with a thin layer of copper-nickel-chromium alloy to give a metallic appearance. Models 2 & 3 used ABS in either Ebony or Ivory color. The film pack contained a flat, 6-volt "PolaPulse" battery to power the camera electronics, drive motor and flash.The original flash system, a disposable "Flash Bar" of 10 bulbs (five on each side, with the user rotating the bar half way through) from General Electric, used logic circuits to detect and fire the next unused flash.