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The 645DF and DF+ Medium Format Autofocus Digital Camera Body is an open platform, digital-only medium format camera that handles like a 35mm SLR, but with an image area almost 3 times as large (56 x 41.5 mm).
Using any of the 15 existing Mamiya 645AF system lenses (available separately), you have flash sync shutter speeds of up to 1/125s, and with any of 3 dedicated Mamiya lenses that have integral leaf shutters (available separately), you can achieve flash sync speeds up to 1/1600s. The 645DF's dual shutter system allows you to choose between the integral focal plane shutter and the leaf shutter when using one of these 3 lenses (the Sekor AF 55mm f/2.8 LS D, Sekor AF 80mm f/2.8 LS D, and the Sekor AF 110mm f/2.8 LS D).