This is adapter ring, mount allows you to attach any PK Lens to your Canon EF EOS camera body including the DSLR . Main Features: 1)This is adapter ring, mount allows you to attach any PK Lens to your Canon EF EOS camera body including the DSLR (10D, 20D, 300D,30D,40D,450D,50D, 350D, Digital Rebel, D60, D30, 1D, 1DS) . This item contains lock pin which will allow you to adjust to infinity focus. ...