Nikon D810 Product Manual - Page 224
Using FV Lock with the Built-in Flash, Using FV Lock with Optional Flash Units, Metering, Flash unit
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A 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, 0 331). 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. Note that when commander mode is selected for Custom Setting e3 (Flash cntrl for built-in flash, 0 331), you will need to set the flash control mode for the master or at least one remote group to TTL or AA. A Metering The metering areas for FV lock when using optional flash unit are as follows: Flash unit Stand-alone flash unit Used with other flash units (Advanced Wireless Lighting) Flash mode i-TTL AA i-TTL AA A (master flash) Metered area 6-mm circle in center of frame Area metered by flash exposure meter Entire frame Area metered by flash exposure meter 200