Used Mamiya 120/220 Film Back HM401 | U8

The Mamiya HM401 120/220 Film Back is the standard interchangeable film magazine for the Mamiya 645AF and 645AFD camera systems. It allows photographers to swap film types or speeds in seconds without sacrificing the remainder of a roll, making it especially useful in studio and commercial workflows. An integrated LCD provides exposure and film information even when the back is detached from the camera, thanks to its built-in CR2032 backup battery. The motorized loading system automatically advances the film to the first frame, reducing setup time and minimizing loading errors. Its removable insert, locking dark slide, and robust construction make it a dependable accessory for professional medium-format photography. Even today, the HM401 remains highly sought after by film photographers using Mamiya 645 AF-series cameras because it combines convenience, reliability, and compatibility with both 120 and 220 roll films.