Nikon D700 - Manual (Page 220)

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D Using FV Lock with the Built-in Flash
FV lock is only available with the built-in flash when TTL (the default
option) is selected for Custom Setting e3 (Flash cntrl for built-in flash,
pg. 309).
A Using FV Lock with Optional Flash Units
FV lock is also available with SB-900, SB-800, SB-600, SB-400, and SB-R200
flash units (available separately). Set the optional flash to TTL mode (the
SB-900 and SB-800 can also be used in AA mode; see the flash manual for
details). While FV lock is in effect, flash output will automatically be
adjusted for changes in flash zoom head position.
When Commander mode is selected for Custom Setting e3 (Flash cntrl
for built-in flash, pg. 309), FV lock can be used with remote SB-900,
SB-800, SB-600, or SB-R200 flash units if (a) any of the built-in flash, flash
group A, or flash group B is in TTL mode, or (b) a flash group is composed
entirely of SB-900 and SB-800 flash units in TTL or AA mode.
A Metering
The metering areas for FV lock when using optional speedlight are as
follows:
A See Also
For information on using the depth-of-field preview or AE-L/AF-L button for
FV lock, see Custom Setting f6 (Assign preview button, pg. 324) or
Custom Setting f7 (Assign AE-L/AF-L button, pg. 325).
Speedlight Flash mode Metered area
Stand-alone flash unit
i-TTL 5-mm circle in center of frame
AA
Area metered by flash exposure
meter
Used with other flash
units (Advanced
Wireless Lighting)
i-TTL Entire frame
AA
Area metered by flash exposure
meter A (master flash)