Nikon D4 - Manual (Page 37)

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Matching Settings to Your Goal
The Viewfi nder The Viewfi nder
When Viewfi nder virtual horizon is selected for Custom
Setting f3 (Assign Fn button) or f4 (Assign preview but-
ton) > Press, pressing the button displays pitch and roll
indicators in the viewfi nder.
Roll
Camera tilted right Camera tilted right Camera horizontal Camera horizontal Camera tilted left Camera tilted left
Pitch
Camera tilted forward Camera tilted forward Camera vertical Camera vertical Camera tilted back Camera tilted back
The roles of the indicators are reversed when the camera is
rotated to take pictures in “tall” (portrait) orientation.