The 50mm f/3.5 Zenzanon-S is a wide-angle prime lens for the Zenza Bronica SQ-series 6x6 medium-format SLR system, fitting the bayonet mount used by the SQ, SQ-A, SQ-Ai and SQ-B bodies. On the 6x6 format the 50mm focal length gives a moderately wide field of view, and the lens was designed for landscape, architectural and environmental work where coverage matters more than maximum speed.

UK auction activity for this lens is thin, with the only verified hammer result in our records selling for £25 at a UK saleroom in late 2025. That figure is a wholesale auction-hammer price rather than a dealer asking price, so retail value for a clean, fungus-free copy with caps and a working aperture would be expected to sit higher in 2026, though buyers should treat a single data point with caution when judging what one is truly worth today.