Sigma MOUNT CONVERTER MC-11 (EF-E) firmware v1.25

Sigma · Released May 23, 2019 · First seen Jul 5, 2026

v1.25 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

Adds compatibility with a sports lens and improves autofocus performance with specific Sony cameras and Art lens combinations.

  • Compatible with SIGMA 120-300mm F2.8 Sports lens for CANON EF mount with firmware Ver.2.01
  • Faster autofocus with SONY α9 and α7 III when paired with SIGMA 135mm F1.8 Art lens

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

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What's in this update

It has become compatible with the SIGMA 120-300mm F2.8 DG OS HSM | Sports for CANON E​F mount, that has the latest firmware Ver.2.01.It has improved the A​F speed when it is used in combination with the SONY α9 or SONY α7 III and the SIGMA 135mm F1.8 DG HSM | Art for CANON EF mount.

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Other versions for this product

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