From Sigma:
Thank you for purchasing and using our products. We would like to announce that a firmware update for the SIGMA MOUNT CONVERTER MC-11 EF-E is now available.
This firmware update makes the SIGMA MOUNT CONVERTER MC-11 EF-E compatible with the latest firmware of existing SIGMA interchangeable lenses. For customers who own the SIGMA MOUNT CONVERTER MC-11 EF-E, please update the firmware via SIGMA Optimization Pro? by connecting it to a computer using the supplied USB Cable. Before updating the MC-11 firmware, please ensure SIGMA Optimization Pro has been updated to ver. 1.4.1 or later for Windows, and ver. 1.4.0 or later for Macintosh from the following download page.
Applicable Product
Benefits of the Update
* SIGMA 14mm F1.8 DG HSM | Art?SIGMA 20mm F1.4 DG HSM | Art?SIGMA 24mm F1.4 DG HSM | Art?SIGMA 12-24mm F4 DG HSM | Art?SIGMA 50-100mm F1.8 DC HSM | Art
Download: SIGMA Optimization Pro