A series of modular medium format 6x4.5 SLR film cameras made by Bronica and produced between 1976 and 2004. Seventeen lenses with electronically controlled Seiko leaf shutters were made for the ETR-system, ranging from a fisheye to 500mm telephoto. The ETR system is one of the most affordable ways to get into medium format photography with interchangeable lenses without compromising image quality. Ease of use is one of the key features of this system.

Like the Hasselblad V system, these offer interchangeable film backs, viewfinders, focusing screens, lenses and various accessories like grips. There are also several versions of the body.