The Nikon D800 offers a wide variety of accessories to improve features, functionality and usability. The following are official Nikon accessories for the D800 camera:
D800 Battery Grip (MB-D12) - Multi Power Battery Pack
D800 Battery Pack (EN-EL15) - Rechargeable Li-ion Battery
Nikon GP-1 GPS Unit (GP-1) – Geotag your images automatically with GPS coordinates, altitude and time as photos are taken.
Nikon AC Power Adapter (EH-5a) - Power your D800 using AC power
Nikon Power Supply Connector (EP-5B) allows you to connect your D800 to an external power supply.
3rd Party Accessories
RRS – Really Right Stuff
Camera plate for Nikon D800 (PZ-146)
L-bracket for Nikon D800 (BL-D800)
Camera plate for Nikon D800 with MB-D12 (PZ-147)
L-bracket for Nikon D800 with MB-D12 (BL-D800G)