Sigma MOUNT CONVERTER MC-11 (EF-E)
firmware v1.43
Sigma · Released Aug 27, 2026 · First seen Aug 28, 2026
v1.43 is the latest firmware for the Sigma MOUNT CONVERTER MC-11 (EF-E), released August 27, 2026.
In short — summary by updatemystuff.com
Added support for Sigma High Speed cinema lenses and fixed flash release lag.
- Support for Sigma High Speed Zoom 18-35mm T2 cinema lens
- Support for Sigma FF High Speed Prime 35mm T1.5 cinema lens
- Fixed flash release time lag under specific shooting conditions
Written from Sigma's release notes, which are printed in full below.
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What's in this update
- Added support for the Sigma High Speed Zoom Line 18-35mm T2 for Canon EF mount, firmware Ver. 1.01.
- Added support for the Sigma FF High Speed Prime Line 35mm T1.5 for Canon EF mount, firmware Ver. 1.01.
- Improved a release time lag issue that occurs under specific settings during flash photography.
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See the full firmware history for the MOUNT CONVERTER MC-11 (EF-E)