This little camera continues to impress. I've tried it with several different lenses now. With ample lighting it's an impressive performer. Beyond ISO800 I prefer the D800.
Nikon 70-200 f2.8 VRII w/2x TC.
1/1600s f/5.6 at 400.0mm iso800
26-May-2013 17:55:42
Nikon 300mm f4 (IMO this is THE lens to match with the D7100)
1/1600s f/5.0 at 300.0mm iso250
19-May-2013 20:53:35
As you can see in this next one, the focus tracking has no problem with a target closing at high speed.
Nikon 500mm f4
1/2000s f/5.6 at 500.0mm iso500
27-May-2013 08:56:21
This one's momma never taught it not to talk with food in its mouth. The prior frame was a bit OOF but it reveals the bird with its mouth wide open screeching at someone.
1/2000s f/5.6 at 500.0mm iso400
27-May-2013 08:58:13