Sigma 100-400mm F5-6.3 DG OS HSM | Contemporary (Canon EF mount)
firmware v2.04
Sigma · Released Feb 21, 2019 · First seen Jul 5, 2026
v2.04 is not the latest firmware for the Sigma 100-400mm F5-6.3 DG OS HSM / Contemporary (Canon EF mount): the current version is v2.07 (October 22, 2020). Go to v2.07
In short — summary by updatemystuff.com
Fixes camera restart failure when lens removed with OS active and focus driving stalling during video autofocus.
- Camera restart now works when lens removed with optical stabilization enabled
- Autofocus no longer stalls during video recording when focusing across distances
Written from Sigma's release notes, which are printed in full below.
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What's in this update
It has corrected the phenomenon whereby restarting the camera does not work when the lens is taken off the camera while the lens’s OS function is in operation. It has corrected the phenomenon whereby it may stop the focus driving from infinity to closer focus distance while shooting video with AF.
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