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

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 roperly 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.

* 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. The following sticker is put on the gift box of compatible flashguns.
For further information, please contact your nearest authorized Sigma Service Station.
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