Nikon D750 DSLR Camera (Body Only) - Manual (Page 378)

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Follow the steps below to take photographs in commander
mode.
1
Adjust settings for the built-in
flash.
Choose the flash control mode and
output level for the built-in flash.
Note that output level can not be
adjusted in
– – mode.
2
Adjust settings for group A.
Choose the flash control mode and
output level for the flash units in
group A.
3
Adjust settings for group B.
Choose the flash control mode and
output level for the flash units in
group B.
4
Select the channel.
5
Press J .