The Mamiya Sekor Z 350mm f/5.6 is a long telephoto lens for the Mamiya RZ67 medium-format SLR system, mounting via the RZ67 bayonet and intended for portrait, wildlife and landscape work where extra reach on the 6x7 frame is required. It sits at the long end of the RZ67 Sekor Z range and was aimed at studio and location professionals working with the RZ67 Pro, Pro II and Pro IID bodies.

Evidence for current value is thin: the only verified UK auction hammer result on file is a single £150 sale from April 2024, so today in 2026 a working copy is worth roughly that figure at saleroom level, with both the median and the recorded range sitting at £150. Because this is a wholesale auction price rather than a dealer asking figure, retail-clean examples typically sell for more once a specialist has serviced and warranted them, and condition, glass clarity and the presence of caps and hood are the main factors that move the price up or down.