I have a Mamiya Super 23 and Universal and have tried putting 35mm into the 120 backs with limited results and was wondering, has anybody else experimented in a similar way. The Mamiya 7 has a panorama adapter to insert in the camera for 24x65, would that adapter fit in a 6x7 or 6x9 back? I noticed someone selling a kit to use 620 and 120 in a rollfilm back, but I didn't purchase and it is now unavailable. Does anyone have any ideas? Let me know.