70mm is also a "normal Hasselblad back"; it served much the same function as bulk film backs for 35mm cameras. There were, of course, issues that kept them from

70mm is also a "normal Hasselblad back"; it served much the same function as bulk film backs for 35mm cameras. There were, of course, issues that kept them from being the default backs for most photographers: the (relatively) small image size, which made for grainier images; the large capacity was actually a negative for most casual and professional uses (if anything was even close to time-sensitive, you'd wind up wasting a lot of film), and the size and weight of the back itself compared to the more typical A12/A24 backs.