Bronica's 645 fisheye — the leaf-shutter Zenzanon-PE 30mm f/3.5 Fisheye for the ETR system.
The Bronica Zenzanon-PE 30mm f/3.5 Fisheye is an ultra-wide fisheye lens for the Bronica ETR 6x4.5 medium-format system. It is part of the later PE generation of Zenzanon optics for the ETRSi era and was one of the most specialised lenses in the ETR range. On the 645 format the 30mm delivers a very wide, curvilinear fisheye field of view.
This manual-focus lens uses the Bronica ETR leaf-shutter mount and provides a focal length of 30mm at a maximum aperture of f/3.5. It carries the in-lens Seiko leaf shutter shared across the ETR system, so flash synchronisation is available at all speeds. As a fisheye it renders strong barrel curvature by design; further construction figures are omitted here because they cannot be confirmed from the sources at hand.
The fisheye produces a dramatic wide view with pronounced curvature of straight lines toward the frame edges, which suits creative landscape, architectural and interior work as well as sky and horizon compositions. It captures an extremely broad angle in a single medium-format frame. Photographers used it for deliberate distortion effects rather than rectilinear coverage.
On the used market this fisheye is scarce and sits among the more expensive ETR lenses because of its specialist nature and limited production. Check the leaf shutter fires evenly across speeds and inspect the protruding front element carefully for scratches, as the exposed glass is vulnerable. Look for haze and fungus inside, confirm the aperture is dry, and verify the mount coupling to the body.