FWIW, Mercury Camera Co. makes a 35mm Pano kit to convert the RB 67 back to handle 35mm film. It replaces the film gate of the back with one with a 35mm 24x67 opening. That should help film flatness. They don't address the film counter as well as is discussed here.
No, that wasn’t a typo. Attaching it to a leader and trailer is much easier than putting it on backing paper like 120. Extremely hard to get it centered. But I’ve had no problems loading either a full 5’ 36 exposures roll, or 65” 220 length roll, into the camera like normal 220.
No, that wasn’t a typo. Attaching it to a leader and trailer is much easier than putting it on backing paper like 120. Extremely hard to get it centered. But I’ve had no problems loading either a full 5’ 36 exposures roll, or 65” 220 length roll, into the camera like normal 220.
I was confused by the reference to: "rolling in backing paper, similar to 220 film".
I never think of 220 film as being in backing paper - rather I think of it as being attached to a leader and attached to a trailer.