The lens does pretty good at 150mm but not so well at about 50-100mm. The photos are not as sharp in that range a great deal of the time. I am at a +7 at 150mm which seems to work (testing done with just real life trial and error) but I am having a tough time finding what works at 50-100mm to find a happy medium. I don't think it is a MA issue in that range. Bad copy? Maybe. Just soft in that range? Could be. So do I, A) return the lens to B&H for another copy and maybe end up with worse, maybe better or B) Send it to Sigma?

Here is a photo I took today at 150mm


IMG_1189 by Denise Trocio ( www.dtrociophotography.com), on Flickr

Not bad! Considering this is the uncropped version...

IMG_1189_uncropped by Denise Trocio ( www.dtrociophotography.com), on Flickr

I can't even crop that much out of a photo with my 100-400mm and end up with a keeper!

So, I am torn as to what to do with the lens. Anyone else ever have this sort of issue with a zoom?