The Mamiya 645 500mm f/5.6 is a long telephoto prime built for the Mamiya 645 medium-format system, covering the 6x4.5 frame at a focal length suited to wildlife, sports and distant landscape work. It mounts on the manual-focus 645 bodies and was designed as a specialist tool when reach beyond the standard short-tele range was required.

Auction data for this lens is thin: the only recorded UK saleroom result on file is a hammer price of £500 from 2012, so a reliable current range or median cannot be drawn from a single data point. As of today in 2026, what a clean copy is worth at auction will depend heavily on glass condition and completeness of hood and caps, and buyers should treat that older figure as historic context rather than a guide to what the lens sells for now.