Nikon SB2G03(11) Manuel D’Utilisation

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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. FV 
lock is available with CLS compatible flash units only (
To use FV lock:
1
Assign FV lock to the Fn button.
Select FV lock for Custom Setting f3 
(Assign Fn button Press
2
Attach a CLS-compatible flash unit.
Mount a CLS-compatible flash unit (
0 193) on the camera 
accessory shoe.
3
Set the flash unit to the appropriate mode.
Turn the flash unit on and set the flash mode to TTL, monitor 
pre-flash AA, or monitor pre-flash A. See the Speedlight 
instruction manual for details.