Nikon D800 User Manual (en)

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Using FV Lock with the Built-in Flash
FV lock is only available with the built-in flash when TTL is selected for 
Custom Setting e3 (Flash cntrl for built-in flash
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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. Note that when commander mode is selected for Custom 
Setting e3 (Flash cntrl for built-in flash
0 301), you will need to set 
the flash control mode for the master or at least one remote group to 
TTL or AA.
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Metering
The metering areas for FV lock when using optional flash unit are as 
follows:
Flash unit
Flash mode
Metered area
Stand-alone flash unit
i-TTL
6-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)
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See Also
For information on using the depth-of-field preview button or 
AE-L/
AF-L
 button for FV lock, see Custom Setting f5 (Assign preview button
0 315) or Custom Setting f6 (Assign AE-L/AF-L button0 315).