FujiFilm X-T30 Owner's Manual page 251

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N
AE LOCK ONLY, AF LOCK ONLY, AE/AF LOCK, AF-ON, and AWB
LOCK ONLY cannot be assigned to the touch function buttons (T-Fn1
through T-Fn4).
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Button assignments can also be selected using D BUTTON/DIAL
SETTING > FUNCTION (Fn) SETTING.
AF-ON
If AF-ON is selected, you can press the control instead of keeping
the shutter button pressed halfway.
MODELING FLASH
If MODELING FLASH is selected when a compatible shoe-mount-
ed fl ash unit is attached, you can press the control to test-fi re the
fl ash and check for shadows and the like (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 (P 142).
The Fn (Function) Buttons
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