From Sigma Global:
Firmware update for SIGMA Global Vision lenses in SONY E-mount
Thank you for purchasing and using our products. We would like to announce that a new firmware update is now available for SIGMA Global Vision lenses in SONY E-mount listed below.
[Applicable products]
[Benefit of the update]
AF assist function during video recording is now supported.
*Only SONY camera models with AF assist function are supported.
[Applicable product]
[Benefits of the update]
AF assist function during video recording is now supported.
*Only SONY camera models with AF assist function are supported.
The focus distance shown on the screen during manual focus has been optimized.
[How to update]
Please select the appropriate product from the following page, go to the download page, click “Sony E-mount” and follow the update procedure. https://www.sigma-global.com/en/support/purpose/firmware/?mode=search&product_category=lens * After the update is complete, be sure to remove the battery pack from the camera and reinsert