Sigma MOUNT CONVERTER MC-11 (SA-E) firmware v1.18

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

v1.18 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

Autofocus speed improved when used with Sony α9/α7 III and Sigma 135mm F1.8 Art lens.

  • AF speed boost for α9/α7 III with 135mm F1.8 Art
  • α9 owners must update camera firmware to Ver.5.00 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 improved the AF speed when it is used in combination with t​he SONY α9 or SONY α7 III and the SIGMA 135mm F1.8 DG HSM | Art for SIGMA. Note: F​or customers who own the SONY α9, please update the firmware of the camera to Ver.5.00 or later.

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Other versions for this product

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