Fotodiox Lens Mount Adapter, Olympus OM Zuiko Lens to Canon EOS Camera for Canon EOS 1D, 1DS, Mark II, III, IV, 5D, Mark II, 7D, 40D, 50D, 60D, 70D, Digital Rebel T2i, T3, T3i, T4i, T5i, SL1
The Fotodiox OM-EOS Lens adapter allows you to place your favorite Olympus OM Zuiko lens on your EOS camera body.  This adapter gives you the ability to use your irreplaceable prime lens and saves you the cost of purchasing new lenses.  The adapters are precision made to insure the perfect fit. The lens will fit physically, but the automatic diaphragm, auto-focusing, and other functions will not operate correctly while using this adapter. In this case, "stop-down mode" will need to be used when metering, since the lens does not have the ability to have its aperture controlled by the camera body. You can shoot in manual or aperture priority mode. Infinity focusing is guaranteed.