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Message: <blockquote data-quote="ffergie" data-source="post: 647708" data-attributes="member: 22715"><p>Thanks for the replies.  A bit more info: I do have a Nikon MB-D15 grip on my camera but I feel that if it were a battery issue, simply depressing the shutter button would not clear it.  I should explain that, in this instance, the camera was not carried over my shoulder, as usual, but in my hand, given the tight quarters in the forest.  There were times that the camera would have been jostled about and upside down.  Is it possible that in one of its "upside down" moments that the mirror would have locked up causing the error?  When the camera is carried over the shoulder while on the tripod, there are no issues.  This is the first time I have had this happen and it has not happened again.  Cheers</p></blockquote><p></p>