The Mamiya Sekor Z 65mm f/4 is a wide-angle lens for the RZ67 medium-format SLR system, covering the 6x7 format with a field of view roughly equivalent to a 32mm lens on 35mm. It was designed for landscape, architectural and editorial work where a moderate wide angle on the larger negative was required, and it uses the RZ67 bayonet mount with electronic coupling to the body's leaf shutter.

Hammer prices in the UK auction market are modest for this lens, with a 2024 saleroom result of £140 providing the only recent benchmark in our records — a wholesale level rather than a retail asking price. Heading into 2026 the 65mm f/4 typically sells for less than the faster wide-angle alternatives in the RZ67 line, and clean copies with original caps and a working leaf shutter tend to attract the strongest interest. With only one verified sale on file, the data point is best treated as indicative of value rather than a firm market range.