The company says that, as well as aligning the flange back distance to retain full functionality, the converter incorporates the digital data necessary to provide fast and smooth AF for compatible lenses as well as OS features and functions of the camera that help control peripheral brightness and correct transverse chromatic aberration, distortion, and more.
The device allows lens type, focal length, F number, and other tags to be embedded as Exif data in the image file.
The converter also features flocking in its interior to help prevent internal reflections and a reduction in lens performance.
Since Sony E-mount camera bodies do not require mechanical integration with lenses for aperture control, the converter makes SA mount lenses and Sigma interchangeable lenses for Canon cameras fully compatible with the automatic exposure control of Sony E-mount camera bodies.
The LED display on the MC-11 makes it easy to know whether an attached lens is compatible or not and whether the mount converter control data needs to be updated for operation with that lens. Lens data updates require the installation of the latest version of Sigma Optimization Pro on your computer and the Sigma USB Dock (sold separately).
The Sigma MC-11 Mount Converter has a suggested retail price (SRP) of $339.95 and is expected to be available in April.