If you're not getting sharp snaps in the AF-C (continuous AF) setting, it's because ... you need to reset Custom Setting A1 to any setting other than the default of RELEASE. (MENU > CUSTOM (pencil) > a Autofocus > a1 AF-C priority selection > FOCUS or RELEASE + FOCUS.) As shipped, the RELEASE setting means the D800 shoots anytime you press the shutter, regardless of if it's in focus or not. Resetting this ensures the D800 only fires when it's actually in focus.
Gator Bob in Gainesville FL D700 & SB800 * D800 on order Nikkors: *14-24 * 28-300 * PC-E 85mm *50mm 1.8 Tamron 90mm Macro