Sigma 100-400mm F5-6.3 DG OS HSM | Contemporary (SIGMA SA-mount) firmware v1.03

Sigma · Released Apr 18, 2019 · First seen Jul 5, 2026

v1.03 is not the latest firmware for the Sigma 100-400mm F5-6.3 DG OS HSM / Contemporary (SIGMA SA-mount): the current version is v1.04 (January 23, 2020). Go to v1.04

In short — summary by updatemystuff.com

Improved viewfinder image stability through Optical Stabilizer updates and better autofocus with MC-21 converter.

  • Optical Stabilizer control algorithm updated for enhanced viewfinder image stability
  • Autofocus speed and quality improved when used with MC-21 converter

Written from Sigma's release notes, which are printed in full below.

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What's in this update

It has improved the stability​ of the image in the viewfinder, making it easier to confirm composition, thanks to the updated control algorithm of the Optical Stabilizer. It has improved the AF speed and quality when the len​s is used with the SIGMA MOUNT CONVERTER MC-21 SA-L.

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Other versions for this product

See the full firmware history for the 100-400mm F5-6.3 DG OS HSM | Contemporary (SIGMA SA-mount)