Ok so the new D750 came today and after an agonizing wait for the battery to charge I was able to go through all the menu items and set everything up the way I wanted it. I started to notice a slight metallic clicking/tapping noise whenever I rotated the camera 90 - 180 degrees in any direction. Almost like a hinged piece of metal falling over. Does any one else have this sound on their D750? I searched online quickly and found nothing. My D90 does not make a sound at all. The camera seems to be functioning as advertised. It's late but the low light capability is astounding. Haven't taken any shots in good light yet. From what I can tell the camera is operating perfectly. It's a bit OCD but the noise really started to bug me (on a $2k camera). Hopefully it's normal. Perhaps the mirror or the focus screen? I'm trying to gauge if this is something to be concerned about as I'd rather exchange it earlier than later if necessary. Thanks as always.