Bronica's 645 portrait tele — the leaf-shutter Zenzanon-PE 180mm f/4.5 for the ETR system.
The Bronica Zenzanon-PE 180mm f/4.5 is a telephoto lens for the Bronica ETR 6x4.5 medium-format system. It is part of the later PE generation of Zenzanon optics developed for the ETRSi era, which succeeded the earlier MC and EII designs. On the 645 frame a 180mm serves as a portrait and medium-telephoto focal length.
This manual-focus lens uses the Bronica ETR leaf-shutter mount and provides a focal length of 180mm at a maximum aperture of f/4.5. It contains the in-lens Seiko leaf shutter shared across the ETR system, giving flash synchronisation at all shutter speeds. Element construction, weight and filter thread are not listed here because they cannot be confirmed from the references consulted.
A 180mm on 6x4.5 works well for portraits taken at a flattering distance and for landscape details and general subjects that need reach. The focal length compresses perspective and isolates the subject against a smoothly rendered background from the larger negative. Steady support is helpful given the slower shutter speeds common in medium-format shooting.
On the used market the PE 180mm is a fairly common ETR telephoto and generally sells at a moderate price. Check the leaf shutter fires evenly at fast and slow speeds and inspect the longer barrel for internal haze or fungus. Confirm the aperture blades are dry and responsive and that the mount and body coupling engage securely without play.