Sigma MOUNT CONVERTER MC-11 (EF-E) firmware v1.41

Sigma · Released Aug 25, 2022 · First seen Jul 5, 2026

v1.41 is not the latest firmware for the Sigma MOUNT CONVERTER MC-11 (EF-E): the current version is v1.43 (August 27, 2026). Go to v1.43

In short — summary by updatemystuff.com

Fixed autofocus and manual focus assist bugs affecting lenses with manual override functionality.

  • MF assist function now works reliably with Manual Override-equipped lenses
  • Autofocus during video recording fixed when the focus ring is adjusted

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

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What's in this update

Fixed a problem in which the MF assist function would not work in rare cases whe​n a lens with the MF switching function (Manual Override) enabled, or a lens with the focus mode switch set to MO was attached.

Fixed a ​problem in which the AF would not work in rare cases when the focus ring was turned during video recording in AF mode with a lens which has the MF switching function (manual override) enabled.

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Other versions for this product

See the full firmware history for the MOUNT CONVERTER MC-11 (EF-E)