D71000's AF system: no FW update?
Nikon just released a FW update for D800 (and D600) that they claim improves tracking in AF-C mode. But people upstairs are claiming it shows improvements (for D800/E) in all AF aspects. Curiously, they didn't do it for D4, which also uses the 51AF system.
Since the system is about same as the one in the D7100, and Nikon said the D7100's AF uses same algorithms as the D4's, maybe it already has the new FW installed.