The Mamiya 645 AF 55-110mm f/4.5 Zoom is an autofocus medium-format zoom lens designed for the Mamiya 645 AF system, covering a short-wide to short-telephoto range on 6x4.5 film. With its constant f/4.5 aperture, it was intended as a versatile walk-around optic for portrait, landscape and general studio work on the 645 AF and later AFD bodies.

At recent UK auction, hammer prices for this zoom have been modest: the two tracked sales in 2025 settled at £60 and £100, giving a median around £80. As of 2026, that is roughly what a working copy sells for at saleroom level, with clean, fungus-free examples pushing toward the upper end of that band and rougher glass worth less.