I had one.. and loved it. But after moving to FX, I chose to use my Nikon 85mm 1.4 primarily... and my 24-70 2.8 if I need wider than the 85. So I sold it to Sharon (sm4him) who loves it. She has posted several images with it.. and they look good. It has wonderful bokeh characteristics... and for the price, is a steal!
(assuming you get a good copy... but with that series of Sigma's ... good copies are the norm. It is their cheaper lenses that often have problems!)
Yep, I bought Charlie's lens, and I *love* it. I was perfectly happy with my Nikon 50mm f/1.8g, but I like the Sigma even more.
Admittedly, I've only had it for a short period of time, and until today, I really hadn't done any shooting in low light conditions with it. But today, I took some photos at a wedding shower in our church and didn't notice any problems at all with the autofocus speed. And the bokeh is much nicer than the Nikon 1.8 was!
I also have the Sigma 150-500 that Scott mentions (in fact, like Charlie, I bought it in part because of the results that Scott was getting with it!) and I've been really pleased with it. No problems with it, in terms of shoddy quality or anything.
From what I have read, not as sharp as the nikons but better bokeh. Sigmas also tend to have an odd color cast. I had an 85 1.4 and was happy with it, no quality issues at all. I also had a cheap zoom, 70-300 I think, a long time ago, and it was so bad I threw a party when it broke.
On the other hand, I had one of those too, the Sigma 70-300. Bought it on Craigslist when I thought the 55-300 I had at the time was gonna die, and that Sigma was the only replacement I could afford at the time. Turned out, not having anything except a kit lens was a MUCH better option than trying to get decent results with that hunk of useless plastic and glass.
I couldn't even resell it, because my conscience wouldn't let me sell anyone such a piece of junk. It's currently serving as a paperweight in my office. :lmao: