Top features: - Allows you to attach Canon EF mount lenses with Sony E mounts - Incorporates data for smooth auto focus and makes lens compatible with exposure control Allows you to attach Canon EF lenses to Sony E mountsThe Sigma MC-11 Lens Mount Converter allows you to use your Sigma and selected Canon EOS lenses with Sony E mount bodies.If you use a Sony a7 / NEX / a5000 or a6000 series camera the MC-11 opens up a whole range of new lenses for use.Incorporated dataThe MC-11 incorporates the digital data necessary to allow fast autofocus for the compatible lenses. Additionally the lens optimises other functions such as aperture control.An LED light on the MC-11 provides easy-to-understand information about lens compatibility or whether firmware updates are required