Sigma’s MC-11 mount converter is a solution to being able to use Canon and Sigma EF-mount lenses on Sony E-mount cameras. It’s well made as we’ve come to expect from the Japanese manufacturer and is relatively slim, adding just 2.5cm to the depth of the camera. Its key characteristic is the way it communicates the information that’s required between camera and lens to enable autofocus functionality and exposure control. It does have a few limitations though. It’s not weather sealed, its performance isn’t guaranteed for all adapted lenses and it works best with Sony E-mount cameras that feature phase detection autofocus.