Originally posted by vinceloc Don't know anywhere else, but here in Manila the exclusive distributor of Sigma calibrates your lens for free to your dslr body if the lens is purchased from them. FF/BF issues are common and can be readily solved with lens calibration.
I bought from general store in mall, yes..it's official guarantee by sigma co. dist including service, I just consider if so many products are having problem FF/BF...BF that happened to me is invisible if you use up f/4.5......and you will recognized when using 2.8 and shoot to focus chart and watch carefully...then you will see the BF..
Our distributor is always warn to the buyer to buy carefully or report immediately if something wrong with the lens....is common problem for third party lens..true..
but .. just not comfort if you buy the new one, you like the stuff but there is something wrong with it ...but that's the risk if we buy third party...we need just be careful