Designed for capturing long running events like weddings, without the need to continually load film, these backs are best combined with the Motor Drive-E, Motor Winder-E/Ei/Ei II, or Speed Grip-E. Given the difficulty in now obtaining 70mm film, this is not a commonly used component. Especially as they were only produced up until the first ETRS generation of cameras, they are also very rare to find.

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.
- A chrome version of this product is shown in the ETR manual, but not named. It is likely there was also a black ETR generation back. No product packaging or instructions have been sighted yet. ↩︎
- The 70mm back was shown in the ETRS generation camera manual, but was not shown in system charts published in ETRS generation brochures, or in the ETRS Mk-II camera manual. In the ETRS camera manual, the back is given a generic name of “70mm Film Back”. This name is found in the ETRS generation product instructions for this component. ↩︎