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Made by Sigma · firmware
The Sigma MC-21 Mount Converter (Canon EF to L-Mount) allows Canon EF mount lenses to be used on L-mount mirrorless cameras from Sigma, Leica, and Panasonic with autofocus support. It retains full electronic communication including phase-detection AF, OSS, and EXIF data transmission. The MC-21 is part of Sigma's L-mount adapter family.
Product released: May 16, 2019
Version 1.4, released December 22, 2022
Last checked for updates: Aug 2, 2026 17:07 UTC
・MF assist is now supported when a SIGMA CINE LENS for Canon EF mount is attached.・It makes the converter compatible with the SIGMA CINE LENS FF High Speed Prime Line 65mm T1.5 FF for Canon EF mount.*When using the SIGMA FF High Speed Prime Line 65mm T1.5 FF for Canon EF mount, be sure to update the firmware of the SIGMA MOUNT CONVERTER MC-21 EF-L to Ver. 1.4.
LatestUpdate has tracked 4 versions of Sigma Mount Converter MC-21 (EF to L-Mount) firmware, released between November 21, 2019 and December 22, 2022.
Official Sigma Mount Converter MC-21 (EF to L-Mount) product page
The Sigma MC-21 Mount Converter (Canon EF to L-Mount) allows Canon EF mount lenses to be used on L-mount mirrorless cameras from Sigma, Leica, and Panasonic with autofocus support. It retains full electronic communication including phase-detection AF, OSS, and EXIF data transmission. The MC-21 is part of Sigma's L-mount adapter family. It was originally released on May 16, 2019.
The latest firmware version of Sigma Mount Converter MC-21 (EF to L-Mount) is 1.4. It was released on December 22, 2022.
Sigma Mount Converter MC-21 (EF to L-Mount) firmware version 1.4 includes the following changes: ・MF assist is now supported when a SIGMA CINE LENS for Canon EF mount is attached.・It makes the converter compatible with the SIGMA CINE LENS FF High Speed Prime Line 65mm T1.5 FF for Canon EF mount.*When using the SIGMA FF High Speed Prime Line 65mm T1.5 FF for Canon EF mount, be sure to update the firmware of the SIGMA MOUNT CONVERTER MC-21 EF-L to Ver. 1.4.
To update the Sigma Mount Converter MC-21 (EF to L-Mount) firmware, download the latest version (1.4) from Sigma's website. Follow Sigma's installation instructions, which typically involve copying the firmware file to a memory card or connecting via USB. You can download the latest firmware from Sigma's support page.
Details and download instructions for the latest Sigma Mount Converter MC-21 (EF to L-Mount) firmware (version 1.4) are on Sigma's official release page: https://www.sigma-global.com/en/support/firmware/mc-21/?mount=ef-l
You can track Sigma Mount Converter MC-21 (EF to L-Mount) firmware updates automatically on LatestUpdate.io. We monitor Sigma's releases and notify you when new firmware versions are available, so you never miss an update.
We have tracked 4 firmware versions of Sigma Mount Converter MC-21 (EF to L-Mount). Sigma releases updates to fix bugs, improve performance, and add new features. Track this product on LatestUpdate.io to be notified of future releases.
Sigma Mount Converter MC-21 (EF to L-Mount) is manufactured by Sigma. Visit the official product page for more information.