FujiFilm X-T2 Owner's Manual page 267

N
Button assignments can also be selected using
D BUTTON/DIAL SETTING > Fn/AE-L/AF-L BUTTON
SETTING. The selector can not be assigned more than
one role at a time.
AF-ON
If AF-ON is selected, you can press the control in-
stead of keeping the shutter button pressed halfway.
MODELING FLASH
If MODELING FLASH is selected, you can press the
control to test-fi re the fl ash (modeling fl ash).
TTL-LOCK
If TTL-LOCK is selected, you can press the control to
lock fl ash output according to the option selected for
F FLASH SETTING > TTL-LOCK MODE (
The Fn (Function) Buttons
P
160).
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