Sigma MOUNT CONVERTER MC-21 (EF-L) firmware v1.4

Sigma · Released Dec 22, 2022 · First seen Jul 5, 2026

v1.4 is the latest firmware for the Sigma MOUNT CONVERTER MC-21 (EF-L), released December 22, 2022.

In short — summary by updatemystuff.com

Adds manual focus assist support for Canon EF mount cinema lenses and compatibility with a 65mm prime lens.

  • Manual focus assist now works with Canon EF mount SIGMA cinema lenses
  • Compatible with SIGMA FF High Speed Prime Line 65mm T1.5 FF for Canon EF mount

Written from Sigma's release notes, which are printed in full below.

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What's in this update

  • MF assist i​s 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 S​IGMA 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.

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Other versions for this product

See the full firmware history for the MOUNT CONVERTER MC-21 (EF-L)