Sigma MOUNT CONVERTER MC-21 (EF-L)
firmware v1.3
Sigma · Released Jun 25, 2020 · First seen Jul 5, 2026
v1.3 is not the latest firmware for the Sigma MOUNT CONVERTER MC-21 (EF-L): the current version is v1.4 (December 22, 2022). Go to v1.4
In short — summary by updatemystuff.com
Fixes incorrect lens name displays, DC crop mode failures for some lenses, and rare communication issues.
- Corrects incorrect product name displays for certain lenses
- Fixes DC crop mode malfunction for DC lenses in Auto mode
- Resolves rare communication problems with SIGMA fp
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 name 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.
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