Nikon D700 - Manual (Page 362)

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Auto Image Rotation
Photographs taken while On (the default option) is selected
contain information on camera orientation, allowing them to be
rotated automatically during playback (pg. 265) or when viewed in
ViewNX or Capture NX 2 (available separately; pg. 388). The
following orientations are recorded:
Camera orientation is not recorded when Off is selected. Choose
this option when taking photographs with the lens pointing up or
down.
A Rotate Tall
To automatically rotate “tall” (portrait-orientation) photographs for
display during playback, select On for the Rotate tall option in the
playback menu (pg. 265). Note that because the camera itself is already in
the appropriate orientation during shooting, images are not rotated
automatically during image review (pg. 219).
Landscape (wide)
orientation
Camera rotated 90°
clockwise
Camera rotated 90°
counter-clockwise