Nikon D800 User Manual (en)

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FV Lock
This feature is used to lock flash output, allowing photographs to 
be recomposed without changing the flash level and ensuring that 
flash output is appropriate to the subject even when the subject is 
not positioned in the center of the frame. Flash output is adjusted 
automatically for any changes in ISO sensitivity and aperture.
To use FV lock:
1
Assign FV lock to the Fn button.
Select FV lock for Custom Setting f4 
(Assign Fn button Fn button press
0 311).
2
Press the flash pop-up button.
The built-in flash will pop up and begin 
charging.
3
Focus.
Position the subject in the 
center of the frame and press 
the shutter-release button 
halfway to focus.
Flash pop-up button