Nissin MG80 Pro Flash for Cameras - Manual (Page 19)

Flash power control modes
When the NAS flash set to the wireless mode, all exposure setting
function will be controlled by the NAS commander.
B
C
D
A
TTL and M exposure mode switch
In Basic group: Press the button.
In Advance groups:
To set different exposure in each group:
1. Press the Group Selection button. When the letter A, B, C or D blinks,
press to change between M and TTL mode.
2. After completing the exposure mode setting,
press the Group Selection button again.
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NOTE
MG80 Pro Commander Mode setting are under Basic Group A. Changing Basic
Group A will affect the On-Camera flash.