The Mamiya 645 210mm f/4 is a manual-focus short telephoto lens for the Mamiya 645 medium format system, covering the 6x4.5cm frame. With its modest f/4 maximum aperture and 210mm focal length, it was designed primarily for portraiture, head-and-shoulders work, and general short-tele applications on 645 bodies.

At UK auction in recent sessions the 210mm f/4 has been a low-priced item, with hammer results sitting between £30 and £50 — a median around £40 at saleroom level, before buyer's premium. These are wholesale auction prices rather than dealer asking figures, and as of today in 2026 the lens still sells for similar money when condition is honest; clean, fungus-free copies tend to push toward the upper end of that range while cosmetically tired examples are worth less.