Bronica's first 645 leaf-shutter SLR — in-lens shutters, interchangeable backs, 1976.
The Bronica ETR is a mid-1970s medium-format SLR that launched Zenza Bronica's 6x4.5 leaf-shutter system. It brought the modular back-and-lens approach to the smaller 645 frame, giving more exposures per roll than 6x6 while keeping interchangeable film magazines and finders.
It is a medium-format (6x4.5) SLR producing a 56x42mm frame on 120 or 220 film through interchangeable film backs. Like the SQ line it uses leaf shutters built into the lenses, so flash synchronises at all speeds, and it is electronically controlled. The body takes interchangeable waist-level or prism finders and focusing screens and mounts Bronica ETR bayonet lenses; a metered prism finder can add TTL metering, while the plain body has none.
The 645 frame and rectangular format suited portrait, wedding, and reportage photographers who wanted more frames per roll and a lighter system than 6x6 or 6x7. With a metered prism the ETR handles more like a large 35mm SLR, making it practical for location work as well as studio use.
Since the body is electronic, confirm it fires on a fresh battery. Test each lens leaf shutter for accurate speeds, check film-back seals and the dark slide, and inspect the mirror, screen, and finder mirror. Foam light seals in body and back commonly perish on cameras of this age and should be checked.