More on Amazon.com : http://www.amazon.com/gp/product/B002JXZL1E?tag=thefatkidin06-20

Fotodiox Pro Lens Mount Adapter Mamiya 645 Lens to Canon EOS Camera for Canon EOS 1D 1DS Mark

Premium-grade Fotodiox adapter
Smooth surface for effortless mount
Infinity focus allowed
Anodized aluminum construction
24 Month Manufacturer Warranty