JonPorter
Member
I only shoot B&W in my 120 cameras and have no need to change films mid-roll. For my RB67 I have a 6x7 and 6x6 back and use whichever one is most appropriate for my subject, reloading at the end of each roll. With my Bronica 6x6 and Mamiya 645 Pro I only have one back for each camera but multiple film inserts, which are faster to change than backs. That way I can shoot several rolls of film before I have to reload.