Nikon D750 DSLR Camera (Body Only) - Manual (Page 468)

440
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 ( 0 345)
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.