The Mamiya 645 AF 45mm f/2.8 is a moderate wide-angle prime for the Mamiya 645 AF/AFD autofocus medium-format system, covering an angle of view roughly equivalent to a 28mm lens on 35mm format. It was designed for landscape, environmental portrait and general reportage work on 6x4.5 film bodies and later adapted for use on Mamiya/Phase One digital backs.

UK auction hammer prices for the 645 AF 45mm f/2.8 are thinly evidenced, with a single recorded sale at £140 in September 2025 setting both the high and the median in our dataset. As of today in 2026 that figure indicates what a clean, working copy is worth at saleroom level — wholesale rather than retail — and dealer asking prices for the same lens are typically higher. With only one data point, individual condition, box contents and buyer interest on the day will swing what the lens sells for more than any version premium.