| Re: Sigma 70-200mm f2.8 for low light situations
Before you send the lens back make sure your target is good enough for the AF to lock on to. If you are not used to the shallow depth of field that f/2.8 produces you could run into focus problems. If the errors persist you may well have fallen victim to Sigma's spurious quality control.
I had this lens a few years back, and found it performed well enough, although a touch soft wide open at 200mm. The reason I replaced it was that contrast and colour did not match my other Nikkors.
RichBrew
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