Sigma MOUNT CONVERTER MC-21 (EF-L)
firmware v1.1
Sigma · Released Nov 21, 2019 · First seen Jul 5, 2026
v1.1 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
Improves autofocus and optical stabilizer performance, adjusts crop mode for incompatible lenses
- Improved autofocus with SIGMA fp
- Fixed optical stabilizer stopping issue
- DC crop mode won't crop on Auto with incompatible lenses
Written from Sigma's release notes, which are printed in full below.
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What's in this update
The firmware will improve the AF performance when using SIGMA fp.The firmware will correct the phenomenon whereby the Optical Stabilizer stops working when using an compatible lens in combination with SIGMA fp.The firmware will optimize the operation of the AF function button and Optical Stabilizer when the lens is used in combination with Panasonic Lumix DC-S1R / S1 that has been updated to the latest firmware.
The firmware will change the DC crop mode not to crop when it is set to Auto when an incompatible lens is attached.
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