The Sigma MC-21 Mount Converter (Sigma SA to L-Mount) allows Sigma SA mount lenses to be used on L-mount mirrorless cameras from Sigma, Leica, and Panasonic with autofocus support. It maintains full electronic communication including phase-detection AF, OS stabilization, and EXIF data. The MC-21 is part of Sigma's L-mount adapter family.
Product released: May 16, 2019
Latest firmware version
Version 1.3, released June 25, 2020
Last checked for updates: Oct 31, 2026 17:35 UTC
What's new in version 1.3
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 phenomenon whereby the crop does not work for some DC lenses when the camera’s DC crop mode is set at “Auto”.The firmware will correct the rarely occurring communication problem with the SIGMA fp.SIGMA MOUNT CONVERTER MC-21 for SA-L firmware Ver.1.1 is available for update at the following site.
LatestUpdate has tracked 3 versions of Sigma Mount Converter MC-21 (SA to L-Mount) firmware, released between November 21, 2019 and June 25, 2020.
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 optimize the communication regarding the current consumption of the Leica SL2.The firmware will improve the phenomenon of overexposure when c…
Version 1.1 - November 21, 2019: The firmware will optimize the communication regarding the current consumption of the Leica SL2.The firmware will improve the phenomenon of overexposure when c…
What is Sigma Mount Converter MC-21 (SA to L-Mount)?
The Sigma MC-21 Mount Converter (Sigma SA to L-Mount) allows Sigma SA mount lenses to be used on L-mount mirrorless cameras from Sigma, Leica, and Panasonic with autofocus support. It maintains full electronic communication including phase-detection AF, OS stabilization, and EXIF data. 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 (SA to L-Mount)?
The latest firmware version of Sigma Mount Converter MC-21 (SA to L-Mount) is 1.3. It was released on June 25, 2020.
What changed in Sigma Mount Converter MC-21 (SA to L-Mount) firmware version 1.3?
Sigma Mount Converter MC-21 (SA to L-Mount) firmware version 1.3 includes the following changes: 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 phenomenon whereby the crop does not work for some DC lenses when the camera’s DC crop mode is set at “Auto”.The firmware will correct the rarely occurring communication problem with the SIGMA fp.SIGMA MOUNT CONVERTER MC-21 for SA-L firmware Ver.1.1 is available for update at the following site.
Where can I download the latest Sigma Mount Converter MC-21 (SA to L-Mount) firmware?
Details and download instructions for the latest Sigma Mount Converter MC-21 (SA to L-Mount) firmware (version 1.3) are on Sigma's official release page: https://www.sigma-global.com/en/support/firmware/mc-21/?mount=sa-l
How often does Sigma release firmware updates for Sigma Mount Converter MC-21 (SA to L-Mount)?
We have tracked 3 firmware versions of Sigma Mount Converter MC-21 (SA to L-Mount).