Sigma ELECTRONIC FLASH EF-630 (Canon EF mount) firmware v1.03

Sigma · Released Jun 12, 2018 · First seen Jul 5, 2026

v1.03 is not the latest firmware for the Sigma ELECTRONIC FLASH EF-630 (Canon EF mount): the current version is v1.05 (August 5, 2021). Go to v1.05

In short — summary by updatemystuff.com

Fixes flash failure after Auto Power Off recovery

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 phenomeno​n where it does not flash properly after recovering from Auto Power Off.

  • SIGMA FLASH USB DOCK FD-11 for SIGMA with firmware Ver.1.01 will be required to update the firmware.
  • Before updating the firmware of the SIGMA ELECT​RONIC FLASH EF-630, please update SIGMA Optimization Pro to Ver. 1.4.1 or later for Windows, and Ver. 1.4.0 or later for Macintosh.
  • It takes about 3 minutes to update the firmware.

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Other versions for this product

See the full firmware history for the ELECTRONIC FLASH EF-630 (Canon EF mount)