I know I needed a zoom lens, the 85mm f1.8 wasn't cutting it anymore, now don't get me wrong I LOVE my Nikon prime lens, but with me doing more racing, concert and wedding photography I needed something with some zoom. I researched my ass off on the lenses, Nikon, Sigma, Tamron...I swear I spent hours comparing each one and looking at videos from other photographers on the interwebs hearing their reviews on the lenses. The price point was the major focus, since I am trying to do this on a very low budget. I ended up going with the sigma lens and lets just say I got more than I was expecting.
This thing is sharp for being a second party lens and after a few shots I got used to the zoom being backwards...
I ordered the lens from B&H and really didn't have much time to test it before my upcoming concert gig. I took the 70-200 with my 85 in my bag just in case. I started with the sigma lens and kept it on the camera throughout the whole concert. After a few shutter clicks I bumped it up to f4 with high ISO and a shutter speed constant around 200. My images were coming out amazing, grainy but awesome. I knew at high iso on the d610 I was going to have grain, but its something to be expected and something that can be fixed in Lightroom.
The lens has a few down sides though, in low light it does have a problem tracking focus and holding that focus, plus it is heavy. Its a solid 5 pounds add the 3 pound of my 610 with grip and hours of holding the camera out and I felt like I was back at WXII with my XDCAM.
Would I recommend this lens?
OF COURSE, if you are looking for a great zoom full frame lens for $1000 less than Nikon this is your glass to go with. I'm sure I will be adding more Sigma lenses to my bag soon!