Nikon Df - Manual (Page 285)

265
U
K Playback
Fn button performs same function as K button.
Select when using a telephoto lens or in other
circumstances in which it is difficult to operate the K
button with your left hand.
None Pressing the button has no effect.
A
Incompatible Options
If the option selected for Press can not be used in combination with the
option selected for Press + command dials, a message will be
displayed and whichever of Press or Press + command dials was
selected first will be set to None.
A
Viewfinder Virtual Horizon
When Viewfinder virtual horizon is selected for Custom Setting f4
(Assign Fn button) > Press, pressing the Fn button converts the
exposure indicator in the viewfinder to a roll display. Press the button
again to restore the indicator to its normal function.
Camera tilted right Camera level Camera tilted left
Viewfinder
Note that the display may not be accurate when the camera is tilted at a
sharp angle forward or back. For a display that shows both pitch and
roll, use the Virtual horizon option in the setup menu (0 282).
Option Description