Nikon Df - Manual (Page 143)

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l
A
Flash Control Mode
The information display shows the flash control mode for optional flash
units attached to the camera accessory shoe as follows:
Flash sync Auto FP ( 0 257)
i-TTL
Auto aperture (AA)
Non-TTL auto flash (A)
Distance-priority manual (GN)
Manual
Repeating flash —
Advanced wireless lighting