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Title: SIgma 28-70mm
Review: I ran the 28-70 2.8 through the paces and it's off to SIGMA for calabration after one day. I read many reports of focus issues from 2.8 through about 4.5. I rolled the dice and lost. The autofocus missed on 99% of the shots running up to about f 4.5. From f4.5 through f-11 the images improved as expected. The build seems very good, just a calibration in my case ( I hope ). I will let you know with an update once the lense comes back from service. Now I do believe this lens will perfrom if the calibration works, because my f7 shots looked great for a lens at this price. The lense did overexpose about 1/3 stop, but it was easily fixed. This was my first Sigma and I am going to give it a chance and re-review once it gets back, just seems the quality control issue people have with this lens is true.
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