Nikon D750 DSLR Camera (Body Only) - Manual (Page 377)

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Option Description
Built-in
flash
Choose a flash mode for the built-in flash (commander
flash). When an optional SB-500 flash unit is attached, this
option changes to
Optional flash and is used to choose a
flash mode for the SB-500. Otherwise this option is
identical to
Built-in flash .
TTL
i-TTL mode. Choose flash compensation from values
between +3.0 and –3.0 EV in increments of
1 /
3
EV.
M Choose the flash level.
– –
The built-in flash does not fire, although remote flash units
do. The built-in flash must be raised so that it can emit
monitor pre-flashes.
Group A Choose a flash mode for all flash units in group A.
TTL
i-TTL mode. Choose flash compensation from values
between +3.0 and –3.0 EV in increments of
1 /
3
EV.
AA
Auto aperture (available only with compatible flash units;
0 435). Choose flash compensation from values between
+3.0 and –3.0 EV in increments of 1 /
3
EV.
M Choose the flash level.
– – The flash units in this group do not fire.
Group B
Choose a flash mode for all flash units in group B. The
options available are the same as those listed for
Group A ,
above.
Channel
Choose from channels 1–4. All flash units in both groups
must be set to the same channel.