Bronica's mid-60s 6x6 SLR — focal-plane shutter, interchangeable backs and lenses, 1965.
The Bronica S2 is a mid-1960s medium-format SLR that revised the earlier S body within Zenza Bronica's square-format system. It kept the modular design with interchangeable backs and lenses while updating the mechanism, and became one of the more widely used bodies in the pre-leaf-shutter Bronica line.
It is a medium-format (6x6) SLR shooting a 56x56mm square frame on 120 film through interchangeable film backs. It uses a body focal-plane shutter and the characteristic downward-travelling instant-return mirror of the S series. The body takes interchangeable finders and focusing screens and mounts Bronica S-series bayonet lenses, including Nikkor optics; there is no built-in meter, so exposure is set manually or with an external meter.
The focal-plane shutter and interchangeable film inserts made the S2 practical for studio and portrait sessions where quick film changes matter. Its all-mechanical operation and square waist-level viewing suit deliberate work, and the wide lens range gives flexibility for general medium-format photography.
The film-advance mechanism is a known weak point on some S2 bodies, so test winding and shutter cocking carefully, along with the downward mirror action. Check the focal-plane curtain, film-back seals and dark slide, focusing screen, and finder mirror. Confirm lens compatibility within the S mount, as later S2A optics can differ.