Nikon 13187 User Guide (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 f2 (Assign Fn 
button
2
Raise the flash.
In PSAM, and 
0 modes, the flash can be raised 
by pressing the 
M (Y) button. In i, k, p, n, o, 
s, and w modes, the flash will pop up 
automatically when required.
3
Focus.
Position the subject in the center of the frame 
and press the shutter-release button halfway to 
focus.
4
Lock flash level.
After confirming that the flash ready indicator (
M) 
is displayed in the viewfinder, press the Fn 
button. The flash will emit a monitor preflash to 
determine the appropriate flash level. Flash 
output will be locked at this level and FV lock 
icons (
e) will appear in the viewfinder.
M (Y) button
Fn
 button