Mamiya RB67 120 BACK

All film magazines will attach to all RB bodies. 120 and 220 inserts are interchangeable, but it must be within generation types: non-Pro with non-Pro, Pro-S with Pro-S, Pro-SD with Pro-SD. RB backs are not interchangeable with RZ backs. . 6x7 -120: 10 exp/120 roll film. 6x7 -220: 20 exp/220 roll film. 6x7 -70mm: 54 exp/70mm roll film. 6x4.5 -120/220: 15exp/120 or 30 exp/220.