Got a couple of Sigma lenses that need repair. A 24-70 2.8 IF EX DG that more than likely needs an autofocus motor as it works fine in manual and a 70-200 2.8 APO EX DG OSwhich gives me the dreaded F0 when attached to any body and yes I have checked and cleaned all the contacts.

My options are send directly to Sigma in NY or to one of their authorized repair dealers. Is one better then the other? I mean they all do the same type of repairs right? Anyone have any stories or advice? The 70-200 I bought new but is out of warranty and the other I bought for really short money as it worked sporadically and knew I'd need to send it out eventually. Anyone??