Sigma MOUNT CONVERTER MC-11 (EF-E) firmware v1.26

Sigma · Released Jun 20, 2019 · First seen Jul 5, 2026

v1.26 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 three Sigma lenses: 24mm F1.4 Art, 18-200mm Contemporary, and 18-300mm Contemporary.

  • 24mm F1.4 Art lens compatible (firmware 2.01)
  • 18-200mm F3.5-6.3 Contemporary lens compatible (firmware 2.02)
  • 18-300mm F3.5-6.3 Contemporary lens compatible (firmware 2.01)

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 24mm F1.4 DG HSM | Art for CANON EF mount, that has the latest firmware​ Ver.2.01.It has become compatible with the SIGMA 18-200mm F3.5-6.3 DC MACRO OS HSM | Contemporary for CANON EF mount, that has the latest firmware Ver.2.02.It has become compatible with the SI​GMA 18-300mm F3.5-6.3 DC MACRO OS HSM | Contemporary for CANON EF mount, that has the latest firmware Ver.2.01.

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Other versions for this product

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