Nikon D3x User Guide

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Virtual Horizon
When [Virtual horizon] is selected for [FUNC. button press], the electronic 
analog exposure displays in the viewfinder and top control panel act as a 
horizontal level when the Fn button is pressed.
Note that the display may not be accurate when the camera is tilted at a 
sharp angle forward or back.
Camera tilted right
Camera level
Camera tilted left
Control panel
Viewfinder