These backs were designed to allow an instant preview of exposure for a shot, with the developed 6×4.5cm picture occupying just a portion of the larger polaroid film image area. As Polaroid Land Pack film is no longer in production, these backs are useless, but still seem to fetch a decent price on the second hand market.
Available Products
The following table summarises the components described on this page, showing the various ETR System generations during which they were available. Names are taken from the component instructions or product packaging, unless otherwise noted.