Sigma MOUNT CONVERTER MC-21 (SA-L) firmware v1.3

Sigma · Released Jun 25, 2020 · First seen Jul 5, 2026

v1.3 is the latest firmware for the Sigma MOUNT CONVERTER MC-21 (SA-L), released June 25, 2020.

In short — summary by updatemystuff.com

Fixed lens name display, DC crop Auto mode, and communication problems.

  • Lens name display corrected for some lenses
  • DC crop function fixed when Auto mode is selected
  • Communication issues with SIGMA fp resolved

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

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What's in this update

The firmware will correct the phenomenon whereby it displays different product’s n​ame for some lenses when it is attached.

The firmware will correct the phenomenon whereby the crop does not work for some DC lenses when the camera’s DC crop mode is set​ at “Auto”.The firmware will correct the rarely occurring communication problem with the SIGMA fp.SIGMA MOUNT CONVERTER MC-21 for SA-L firmware Ver.1.1 is available for update at the following site.

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Other versions for this product

See the full firmware history for the MOUNT CONVERTER MC-21 (SA-L)