InlawBiker Offline Upload & Sell: On
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You have described the Sigma 17-50 2.8 pretty well. There's not a damn thing wrong with it but, it's not very exciting. I really liked that lens and I used it a lot on DX. It is sharp and well built, I have no problem with it whatsoever.
I also have acquired the Sigma 18-35, it is a better lens than the 17-50, or any other zoom I have used on DX. It's still new to me but, already I like it a lot. Mostly because DX has a scarcity of primes and this lens just fills the gap.
I have had no problems on my d7100 with regard to autofocus. With my D600 in crop mode I have had pretty serious focus problems. As in serious, "why won't this lens focus correctly at all" problems. I'm still not sure what's going on there but I have a feeling that Sigma didn't test the lens very well on FX cameras. But I'm happy with the lens on my DX camera.
As far as I'm concerned there isn't any reason not to at least try this lens and see if it works for you. To me it's clearly better than the 17-50, which I hold in high regard, and it's not really even close. I am going to use it all Summer and come to a more firm conclusion but my early opinion is that this lens rocks.
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