Nikon D700 Mode D'Emploi

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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)