Sigma’s range of EO-ETTL II flashguns do not work with the Canon EOS 50D DSLR camera. The Autozoom function does not work properly, and exposure is not set correctly. Sigma are supplying a free-upgrade service to their customers to solve the problem. All new products shipped after today already include the updated firmware.

Sigma Press Release

Notice to customers using Sigma’s EO-ETTL II type flashguns

2008.10.29 - Sigma’s EF-530 DG SUPER EO-ETTL II, EF-530 DG ST EO-ETTL II, EM-140 DG EO-ETTL II, EF-500 DG SUPER EO-ETTL II and EF-500 DG ST EO-ETTL II do not operate properly with Canon EOS 50D D-SLR camera. To overcome this, we will start supplying a free-upgrade service to our customers today.

Please notice that this problem occurs with the EOS 50D D-SLR camera only.

We deeply apologize for any inconvenience this may have caused to our customers.

Upgrade will be required to overcome the following problems:
  1. The Autozoom function does not work properly.
  2. Exposure is not correct.

List of flashguns requiring update
ELECTRONIC FLASH EF-530 DG SUPER EO-ETTL II Serial Number lower than 1047200
ELECTRONIC FLASH EF-530 DG ST EO-ETTL II Serial Number lower than 1045700
ELECTRONIC FLASH MACRO EM-140 DG EO-ETTL II Serial Number lower than 2054400
ELECTRONIC FLASH EF-500 DG SUPER EO-ETTL II * This update service is only possible if the flashguns’ back panel shows EO-ETTL II marking.
ELECTRONIC FLASH EF-500 DG ST EO-ETTL II * This update service is only possible if the flashguns’ back panel shows EO-ETTL II marking.

* This upgrade service is not available if the flashgun does not support EO-ETTL-II. (They are marked only “EO-ETTL” or “EO” on the back of the body).

Products shipped after today already include this updated firmware.

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