The 120 back is the most common film back available, and one of the few remaining useful backs for modern ETR System users. As 220 film is no longer produced, these backs are no longer of great use. It is possible to load 120 film in a 220 film back, however you may encounter minor degradation in sharpness of the resulting exposures. Note that 120 inserts can be put inside 220 frames, and visa versa.
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.
| Generation | Name | Literature | Notes |
|---|---|---|---|
| ETR | Film Back ETR 120? | Not named in manual, product packaging not yet seen. | |
| ETR | Film Back ETR 120? (chrome) | Not named in manual, product packaging not yet seen. | |
| ETR | Film Back ETR 220? | Not named in manual, product packaging not yet seen. | |
| ETR | Film Back ETR 220? (chrome) | Not named in manual, product packaging not yet seen. | |
| ETRS | Film Back ETRS 120 (in ETR manual) Filmback Magazine 120 (on packaging) | Manual | |
| ETRS | Film Back ETRS 220 (in ETR manual) Filmback Magazine 220 (on packaging) | Manual | |
| ETRS Mk-II | Filmback Magazine 120 | ||
| ETRS Mk-II | Filmback Magazine 220 | ||
| ETRSi | Filmback-Ei 120 | ||
| ETRSi | Filmback-Ei 220 |