Sigma MOUNT CONVERTER MC-11 (SA-E) firmware v1.08

Sigma · Released Sep 8, 2017 · First seen Jul 5, 2026

v1.08 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

Fixes false focus confirmation with certain zoom lenses on Sony a9 and adds compatibility with updated lens firmware versions.

  • Corrected incorrect focus confirmation when using AF-S mode in telephoto range on Sony a9
  • Added compatibility with 24-70mm F2.8 DG OS HSM Art and 100-400mm F5-6.3 DG OS HSM Contemporary at specific firmware versions
  • Requires SIGMA Optimization Pro 1.4.1+ (Windows) or 1.4.0+ (Mac) before updating MC-11

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

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What's in this update

It has corrected the phenomenon which may occur with ​the combination of SIGMA MOUNT CONVERTER MC-11 and some of SIGMA’s interchangeable zoom lenses on Sony a9 (ILCE-9) that when using AF-S mode and shooting in telephoto range, it could occasionally display the shot as in focus, although it may not be correctly locked on the subject.

It has become compatible with the SIGMA 24-70mm F2.8 DG OS HSM | Art for SIGMA (Firmware Ver.1.02), as well as the SIGMA 100-400mm F5-6.3 DG OS HSM | Contemporary for SIGMA (Firmware Ver.1.02).

Note: Before updating the MC-11 firmware, pl​ease ensure SIGMA Optimization Pro has been updated to ver. 1.4.1 or later for Windows, and ver. 1.4.0 or later for Macintosh.

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Other versions for this product

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