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
Latest firmware version
Version 1.4, released December 22, 2022
Last checked for updates: Oct 31, 2026 05:35 UTC
What's new in version 1.4
・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.
Version 1.4 - December 22, 2022: ・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 Pri…
Version 1.3 - June 25, 2020: The firmware will correct the phenomenon whereby it displays different product’s name for some lenses when it is attached.The firmware will correct the phenome…
Version 1.2 - April 23, 2020: The firmware will correct the phenomenon whereby it displays different product’s name for some lenses when it is attached.The firmware will correct the phenome…
Version 1.1 - November 21, 2019: The firmware will correct the phenomenon whereby it displays different product’s name for some lenses when it is attached.The firmware will correct the phenome…
What is Sigma Mount Converter MC-21 (EF to L-Mount)?
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.
What is the latest firmware version of Sigma Mount Converter MC-21 (EF to L-Mount)?
The latest firmware version of Sigma Mount Converter MC-21 (EF to L-Mount) is 1.4. It was released on December 22, 2022.
What changed in Sigma Mount Converter MC-21 (EF to L-Mount) firmware version 1.4?
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.
Where can I download the latest Sigma Mount Converter MC-21 (EF to L-Mount) firmware?
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
How often does Sigma release firmware updates for Sigma Mount Converter MC-21 (EF to L-Mount)?
We have tracked 4 firmware versions of Sigma Mount Converter MC-21 (EF to L-Mount).