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Message: <blockquote data-quote="stmv" data-source="post: 99437" data-attributes="member: 10038">This sounds odd, are you talking G lens? since you are testing on the 5100?  If G lens, then autofocus is built into the lens, and except for passing the setting over to the lens,  no mechanical coupling happening between the D800 and the lens. So, maybe a short is happening but that doesn't makes sense, since you took 400 shots. Perhaps bring both the lens and camera to a PRO certified repair center, hand get a diagnosis.</blockquote>