70mm still photography used film about 70mm wide—slightly wider than 120/220 roll film. In many medium-format systems, it was mainly offered via special 70mm backs or magazines for cameras such as some Hasselblad, Mamiya, and Bronica models.

Its main advantage was not larger image quality, but capacity: you could shoot many more frames before reloading, which made it useful for high-volume work like school portraits, studio jobs, and some aerial photography. In those uses, labs could process long rolls cut from the magazine after shooting.

In many medium-format cameras, the image area was essentially similar to the camera’s normal medium-format frame size, so 70mm did not necessarily mean a bigger negative than 120—just more exposures per load. Some older Kodak-numbered formats such as 116 and 616 also used 70mm-wide stock, producing large negatives around 2.5 × 4.25 inches.

There were also less common dedicated 70mm still cameras, including some that transported the film horizontally rather than like standard medium-format roll film.

Today, 70mm still photography is mostly a niche or collector interest because the equipment and backs are rare and the format offered limited advantages outside high-volume shooting.