Nikon EH-6 AC Adapter The EH-6b AC Adapter is an AC Adapter that can power select Nikon D-SLR cameras from an AC power source, useful when shooting long sessions. For the D4, D3, D200, and D2's. The EH-6b AC Adapter is an AC Adapter that can power select Nikon D-SLR cameras from an AC power source, useful when shooting long sessions. For the D4, D3, D200, and D2's. The EH-6b AC Adapter is an AC Adapter that can power select Nikon D-SLR cameras from an AC power source, useful when shooting long sessions. For the D4, D3, D200, and D2's. When used with the Nikon D4 cameras (only), use of the EH-6 AC adapters require the use of the EP-6 power supply connector, which uses the D4 battery compartment. When used with the Nikon D4 cameras (only), use of the EH-6 AC adapters require the use of the EP-6 power supply connector, which uses the D4 battery compartment.