Nikon D500 User Manual

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207
A
Metering
The metering areas for FV lock are as follows:
Flash unit
Flash mode
Metered area
Stand-alone flash 
unit
i-TTL
6-mm circle in center of frame
qA
Area metered by flash exposure 
meter
Used with other flash 
units (Advanced 
Wireless Lighting)
i-TTL
Entire frame
qA
Area metered by flash exposure 
meter
A (master 
flash)