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KarlosDaJackal
11th of November 2008 (Tue), 16:01
From >> http://www.sigma-photo.co.jp/english/news/info_081029.htm

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.
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.
.
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All 500's seem to be affected, some 530s (serial numbers are listed on the link above). Any new ones have a sticker on the box saying "50d compatible"
DaddyinKC
2nd of March 2009 (Mon), 20:57
Has anyone had this firmware upgrade done on their flash yet?
sandro9mm
16th of March 2009 (Mon), 15:12
well Im in trouble... mine doesn't work, exposure goes crazy, and flash zoom just goes bla bla... any fix? or should I contact sigma?
40Dude6aedyk
16th of March 2009 (Mon), 15:17
Start with the usual suspects: batteries and perhaps a better connection to the hot shoe.
sandro9mm
16th of March 2009 (Mon), 15:18
Start with the usual suspects: batteries and perhaps a better connection to the hot shoe.
it's firmware...
40Dude6aedyk
16th of March 2009 (Mon), 17:42
Oh, you mean it never worked from the very first time you tried.
sandro9mm
16th of March 2009 (Mon), 17:48
it worked for me on 20D, it worked fine... I upgraded to 50D and it doesn't work, it messes up exposure of the camera... could this damage my new baby? I did some tests... now scared of frieing 50D,
Milamu'g
16th of March 2009 (Mon), 21:30
? So how are you in trouble? Sigma acknowledges the problem and offers free repair service. Just contact your nearest Sigma service point and sent in your flash.