Bronica's 6x6 wide-angle — the leaf-shutter Zenzanon-PS 65mm f/4 for the SQ system.
The Bronica Zenzanon-PS 65mm f/4 is a wide-angle lens for the Bronica SQ 6x6 medium-format system. It belongs to the later PS generation of Zenzanon optics for the SQ-Ai era, which succeeded the earlier S lenses. On the square 6x6 frame a 65mm sits moderately wide of normal, making it a useful scenic and general-purpose focal length.
This manual-focus lens uses the Bronica SQ leaf-shutter mount and provides a focal length of 65mm at a maximum aperture of f/4. 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 stated without confirmation from the sources consulted.
The 65mm covers a moderately wide angle of view on 6x6 that works well for landscapes, architecture, interiors and general subjects, giving more context than the normal lens without strong wide-angle distortion. The larger negative renders smooth tonal gradation, and stopping down extends depth of field for scenic and building work. It is a practical everyday wide for the SQ.
On the used market the PS 65mm is a fairly common SQ wide and is generally reasonably priced. Check the leaf shutter fires evenly at all speeds and inspect the glass for haze, fungus and separation. Confirm the aperture blades are dry and responsive and that the coupling to the SQ body and film back is secure and free of play.