scud said:the connector is the same for E2 & E3.
based on the above, i think it can be used, but dunno what is the risk level.
sms AhV (he has one) but no reply from him yet....
better safe than sorry, so wanted to check 1st before upgrade....
DA, u refering to joseph?
Erh ... i'm not allowed to mention his name .... :bsmilie: but can vouch that it works for both 550EX and 580EX ... performance wise very impressive. But CP did mention to him ( i was around bioing the battery pack :sweatsm: ) that its more for the 580EX, works for the 550EX as well.