Nikon COOLPIX-A - Manual (Page 138)

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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 f button.
Select FV lock for Assign Fn1 button in
the setup menu (
0 193), then press G
to return to the shooting display.
2
Raise the flash.
3
Focus.
Position the subject in the
center of the frame and press
the shutter-release button
halfway to focus.
Flash pop-up control