Sigma Fixes Its Flashguns by Offering Free Upgrade

In a press release, Sigma has announced that their 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 flashguns don’t operate properly with Canon EOS 50D D-SLR camera. To overcome this, they are now offering a free-upgrade service.

Upgrade will be required to overcome the following problems:

1. The Autozoom function does not work properly.

2. Exposure is not correct.