Sigma MOUNT CONVERTER MC-11 (EF-E) firmware v1.28

Sigma · Released Dec 19, 2019 · First seen Jul 5, 2026

v1.28 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 support for four SIGMA lenses with latest firmware versions.

  • Supports 28mm F1.4 DG HSM Art
  • Supports 24-70mm F2.8 DG OS HSM Art
  • Requires Optimization Pro 1.5.0 or later

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 28mm F1.4 DG HSM | Art for CANON EF mount, that has the latest firmware Ver. 1.01.It has become compatible with the SIGMA 24-70mm F2.8 DG OS HSM | Art for​ CANON EF mount, that has the latest firmware Ver. 2.04.It has become compatible with the SIGMA 150-600mm F5-6.3 DG OS HSM | Sports for CANON m​ount, that has the latest firmware Ver. 2.01.It has become compatible with the SIGMA 500mm F4 DG OS HSM | Sports for CANON EF mount, that has the latest firmware Ver. 2.01.

Note: Before updating the SIGMA MOUNT CONVERTER MC-11 firmware, please ensure SIGMA Optimization Pro has been updated to ver. 1.5.0 or later.

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Changed since v1.27

  • It has become compatible with the SIGMA 28mm F1.4 DG HSM | Art for CANON EF mount, that has the latest firmware Ver. 1.01.It has become compatible with the SIGMA 24-70mm F2.8 DG OS HSM | Art for CANON EF mount, that has the latest firmware Ver. 2.04.It has become compatible with the SIGMA 150-600mm F5-6.3 DG OS HSM | Sports for CANON mount, that has the latest firmware Ver. 2.01.It has become compatible with the SIGMA 500mm F4 DG OS HSM | Sports for CANON EF mount, that has the latest firmware Ver. 2.01.

Other versions for this product

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