FujiFilm X100F - Manual (Page 96)

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Focus/Exposure Lock Focus/Exposure Lock
To compose photographs with off -center subjects:
1 Focus: Position the subject in the focus frame and press the shutter button half-
way to lock focus and exposure. Focus and exposure will remain locked while
the shutter button is pressed halfway (AF/AE lock).
P
R AEL/AFL button. The role played by the AEL/AFL button can be chosen using D BUTTON/DIAL SETTING >
FUNCTION (Fn) SETTING ( P 47): choose from AE LOCK ONLY (pressing the AEL/AFL locks exposure but not
focus), AF LOCK ONLY (pressing the AEL/AFL locks focus but not exposure), and AE/AF LOCK (pressing the
AEL/AFL locks both focus and exposure).
2 Recompose: Keep the shutter button pressed halfway or keep the AEL/AFL button
pressed.
R Focus and/or exposure will remain locked while the AEL/AFL button is pressed, whether
or not the shutter button is pressed halfway. If AE&AF ON/OFF SWITCH is selected
for
D BUTTON/DIAL SETTING > AE/AF-LOCK MODE (P 122), focus and/or exposure
lock when the button is pressed and remain locked until the button is pressed again.
P
3 Shoot: Press the button all the way down.