Bronica's ultra-wide for ETR system — 40mm f/4 MC providing wide-angle on 645 medium format.
The Bronica Zenzanon-MC 40mm f/4 is a manual-focus ultra-wide prime for the Bronica ETR 6×4.5 medium-format system, providing approximately 20mm full-frame equivalent coverage on 645 film. Nine elements in 7 groups. Five aperture blades. 62mm filter thread. At approximately 330g. 0.40m MFD.
Nine elements in 7 groups. Five aperture blades. The 62mm filter thread. At approximately 330g. Minimum focus distance of 0.40m. Manual focus. Leaf shutter (8s to 1/500, T, Bulb) in-lens — flash sync at all shutter speeds. Approximately 20mm full-frame equivalent on 6×4.5 film. Bronica ETR mount.
The ETR system's leaf shutter in each lens (rather than a focal-plane shutter in the body) enables flash sync at all shutter speeds, including 1/500 — a key advantage for fill-flash and studio strobe work. The 40mm focal length on 6×4.5 provides the ultra-wide end of the ETR system's range. Third-party lenses for the Bronica ETR use the same mount with full shutter integration.
On the used market the Bronica Zenzanon-MC 40mm f/4 is affordable as a vintage 645 ultra-wide prime. Condition checks: leaf shutter operation at all speeds (especially 1/500), aperture blade condition, 62mm front element for marks. Compatible with Bronica ETRS, ETRC, and ETRSi bodies.