Manual focus 6×6 medium format SLR camera made by Zenza Bronica introduced in 1969. A fully modular camera with interchangeable film backs, lenses, and viewfinders. The focusing helicoid is also interchangeable. This was an improved model of the earlier S2 with an improved film advance mechanism that would result in fewer jams. Metal body available in black and silver.
- Shutter: Mechanical, cloth, focal plane, 1s – 1/1000s + B
- Size: 137 x 103 x 88mm (body only)
- Weight: 887g (body only)
