Bronica's long 6x6 tele — the leaf-shutter Zenzanon-PS 250mm f/5.6 for the SQ system.
The Bronica Zenzanon-PS 250mm f/5.6 is a telephoto lens for the Bronica SQ 6x6 medium-format system. It is part of the later PS generation of Zenzanon optics for the SQ-Ai era, which replaced the earlier S 250mm in the line. On the square 6x6 frame a 250mm gives substantial reach for distant subjects.
This manual-focus lens uses the Bronica SQ leaf-shutter mount, with a focal length of 250mm and a maximum aperture of f/5.6. It carries the in-lens Seiko leaf shutter shared across the SQ system, so flash synchronisation is available at all shutter speeds. Element construction, weight and filter thread are omitted here rather than presented without confirmation from the references used.
On the 6x6 format a 250mm delivers noticeable reach and perspective compression, useful for distant landscape features, tighter general subjects and portraits taken from a distance. The modest f/5.6 aperture keeps the lens reasonably compact for its focal length. Given the longer reach, steady support helps counter the slower shutter speeds typical of medium-format shooting.
On the used market the PS 250mm appears occasionally and is usually affordable, sometimes priced above the older S version for its later coatings. Because it is a longer lens, check carefully for internal haze, fungus and element separation, and confirm the leaf shutter fires evenly at both fast and slow speeds. Verify the aperture blades are clean and dry and that the mount couples securely to the SQ body.