Nikon COOLPIX-A - Manual (Page 140)

120
l
D
Using FV Lock with the Built-in Flash
FV lock is only available with the built-in flash when TTL is selected for
Flash cntrl for built-in flash in the shooting menu (
0 181).
A
Using FV Lock with Optional Flash Units
FV lock is also available with optional flash units in TTL and (where
supported) monitor pre-flash AA and monitor pre-flash A flash control
modes. See the flash unit manual for details.