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:
- The Autozoom function does not work properly.
- Exposure is not correct.
List of flashguns requiring update
ELECTRONIC FLASH EF-530 DG ST 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 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. 
