Fotodiox Pro Lens Mount Adapter - Mamiya RB67 Mount SLR Lens to Sony Alpha A-Mount (and Minolta AF) Mount SLR Camera Body with Built-in Focusing Helicoid, Black (RB67-SnyA-Pro) Mounts Mamiya RB67 Mount SLR lenses to Sony Alpha A-Mount (and Minolta AF) Mount SLR Cameras; Integrated focus control dial for adjusting the lens focus Enhanced craftsmanship and high-tolerance construction for demanding professionals; infinity focus or beyond allowed Precise fit and solid connection; lens has no play, gap or wiggling when mounted on adapter and no adjustments required Precision all-metal construction with chrome plated brass mounts for secure and solid fit 24-Month Fotodiox warranty