Sigma MOUNT CONVERTER MC-11 (SA-E) firmware v1.21

Sigma · Released Jan 23, 2020 · First seen Jul 5, 2026

v1.21 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

Adds compatibility with four Sigma lenses.

  • Compatible with 14-24mm F2.8 Art, 85mm F1.4 Art, 100-400mm F5-6.3 Contemporary, and 500mm F4 Sports DG HSM lenses
  • Requires SIGMA Optimization Pro version 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 c​ompatible with the SIGMA 14-24mm F2.8 DG HSM | Art for SIGMA SA mount, that has the latest firmware Ver.1.01.It has become compatible with the SIGMA 100-400mm F5-6.3 DG OS HSM | Contemporary for SIGMA SA mount, that has the latest firmware Ver.1.04.It has become compatible with the SIGMA 85mm F1.4 DG HSM | Art for SIGMA SA mount, that ha​s the latest firmware Ver.1.03.It has become compatible with the SIGMA 500mm F４ DG OS HSM | Sports for SIGMA SA mount, that has the latest firmware Ver.1.02.

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 v1.20

  • It has become compatible with the SIGMA 14-24mm F2.8 DG HSM | Art for SIGMA SA mount, that has the latest firmware Ver.1.01.It has become compatible with the SIGMA 100-400mm F5-6.3 DG OS HSM | Contemporary for SIGMA SA mount, that has the latest firmware Ver.1.04.It has become compatible with the SIGMA 85mm F1.4 DG HSM | Art for SIGMA SA mount, that has the latest firmware Ver.1.03.It has become compatible with the SIGMA 500mm F４ DG OS HSM | Sports for SIGMA SA mount, that has the latest firmware Ver.1.02.

Other versions for this product

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