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messiah17....I have the older version of this lens...the HSM...tack-sharp...and very fast...I have had several Sigma lenses however that were not sharp...I just send them back to Sigma for a spec-out and check-up...and every-one of them came back spot-on...the Q/C at some of the plants must not be up to par...but Sigma has always stepped up and corrected any issues for me...new lenses I just send the receipt with the lens...on used lenses...it's 50/50 if you pay for the spec-out...but it is truly worth it...
Hi Guys, I have this lens but I am experiencing problems with focus..
It is front focusing and the images are very soft it is very noticeable wide open at 2.8, I am just about to send it back to Sigma to have it calibrated.
mogsyfunk - Make sure and write on a piece of paper SPEC-OUT...and let them know what camera you are using...I usually put my lenses in a plastic bag with a rubber-band around them...and the piece of paper attached by the rubber-band...
I would do this...and you should get it back better than ever....
SPEC-OUT tells the service person to put it back to factory Specifications...if you tell them the type of camera that you would be using..it helps out too..
From my experiences unless there is something else wrong with it...they usually charge you for a cleaning service...on the lens...so depending on the lens...I have paid $50 to $150 for the service...