Nikon D300 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 FUNC. button] > [FUNC. button 
press], pg. 302).
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