User Manual - Page 249

For X-T3 Body - Black.

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229
Shortcuts
9
The Fn (Function) Buttons
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).
•
The selector cannot be assigned more than one role at a time.
•
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  ash unit is attached, you can press the control to test- re the
 ash and check for shadows and the like (modeling  ash).
TTL-LOCK
If TTL-LOCK is selected, you can press the control to lock  ash
output according to the option selected for F FLASH SETTING>
TTL-LOCK MODE (P 142).
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