Nikon D800 User Manual (en)

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Flash Control Mode
The information display shows the flash control mode for optional flash 
units as follows:
Flash sync
Auto FP (
i-TTL
Auto aperture (AA)
Non-TTL auto flash (A)
Distance-priority manual 
(GN)
Manual
Repeating flash
Advanced wireless 
lighting
D
Use Only Nikon Flash Accessories
Use only Nikon flash units. Negative voltages or voltages over 250 V 
applied to the accessory shoe could not only prevent normal operation, 
but damage the sync circuitry of the camera or flash. Before using a 
Nikon flash unit not listed in this section, contact a Nikon-authorized 
service representative for more information.