The KIWIFOTOS LMA-PK_EOS ultra thin lens mount adapter is made from highly refined bronze and chrome plated with a fine finish. This adapter allows you to use PENTAX K lens on your Canon EOS camera. Since the adapter does not provide electrical contact translation, automatic diaphragm, auto-focusing, or any other functions will not operate correctly. In this case "stop-down mode" will need to be used when metering. Preserve all focusing range up to the infinity point.