Sigma MOUNT CONVERTER MC-21 (SA-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 (SA-L): the current version is v1.3 (June 25, 2020). Go to v1.3
In short — summary by updatemystuff.com
Fixes freeze issue, improves autofocus, optimizes stabilizer and button operation with certain systems, and adjusts crop mode behavior.
- Resolves freeze when using SIGMA fp with 24-35mm F2 DG HSM Art lens
- Improves autofocus performance on compatible cameras
- Optimizes AF button and stabilizer operation with Panasonic Lumix S1 series
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 the SIGMA fp freeze when using in combination with SIGMA 24-35mm F2 DG HSM | Art for SIGMA.The firmware will improve the AF performance when using 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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