The LMA-C/Y_EOS lens mount adapter is made from highly refined bronze and chrome plated with a fine finish. This adapter allows to use Contax/Yashica lens on a Canon EOS camera body. Although the lens will fit physically, automatic diaphragm, auto-focusing, or any 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 with manual mode or aperture priority mode with the EOS body. Focusing can be infinity