The Polaroid SX-70 film pack was not the first instant film produced by Polaroid, but it was the first where the print ejected automatically and didn’t need to be peeled apart. The SX-70 film pack offered 10 exposures, and incorporated a flat ‘PolaPulse’ power pack (with exposed contacts on the rear of the film pack) so the camera itself didn’t need a battery. SX-70 film produces square images, but there is a longer border at the bottom edge that contains the chemical ‘pod’ on the rear.
SX-70 film was introduced for the new SX-70 camera series that was introduced in 1972, and despite most models being SLR cameras, they could be folded up for ease of storage. Focusing was initially manual, but the Sonar OneStep version introduced in 1978 offered a sonar autofocus system.
Polaroid also produced a number of non-folding instant cameras that used a lot of the technology of the SX-70 series, such as the Model 1000 OneStep, Presto and The Button.
SX-70 film was developed into the SX-70 Time-Zero Supercolor film in 1980, and this allowed an even shorter development time, and offered brighter colours.
Although SX-70 film was produced by Polaroid until 2005, the SX-70 camera series that used the film had been discontinued in the early 1980s, and later models in the SX-70 series such as the 680 and 690 used the later 600 film packs.
SX-70 film used a gelatin-based emulsion that stays soft for several days as water vapour cannot pass through the Mylar covering. This allowed the image to be manipulated, and is the effect used, for instance, on the cover of Peter Gabriel’s 1980 album that is sometimes referred to as ‘Melt’ due to the cover image. Later Polaroid films such as 600 and Spectra can’t be manipulated in this way.