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"RE: Will MC-30 & EH-5a fit the D800?"
According to the support forum here:http://www.nikonusa.com/Nikon-Products/Product/Power-Adapters/25364/EH-5A-AC-Adapter.html?bvqap=7022-en_us/questions/product/2/25364.htm#tab-ProductDetail-ProductTabs-Forumthe EH-5A will work with the D800. The post is on the 2nd page.