Sigma MOUNT CONVERTER MC-11 (SA-E) firmware v1.27

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

v1.27 is not the latest firmware for the Sigma MOUNT CONVERTER MC-11 (SA-E): the current version is v1.28 (August 27, 2026). Go to v1.28

In short — summary by updatemystuff.com

Fixed manual focus assist and autofocus issues when using lenses with manual override enabled.

  • Manual focus assist now works with manual override-enabled lenses
  • Autofocus works during video recording when 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 when a lens with the MF switching funct​ion (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 recor​ding 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 (SA-E)