The EP-6 is a power supply connector that is required for use when using the EH-6b AC Adapter.
EP-6 Power Supply Connector 1 1
Way overpriced !!! and no Power adapter with this I got this from B&H, its way overpriced, and upon receipt i realized you need another power adapter to be purchased Cmon Nikon Do something about the price on this item, I had to simply return it it was adding out to be too much, Save you $$$ for Glass instead June 29, 2012
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