FujiFilm GFX 50S II Medium Format Mirrorless Camera with 35-70mm Lens Kit - Manual (Page 120)

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Focus/Exposure Lock
Focus and exposure lock when the shutter button is pressed
halfway.
1 Position the subject in the focus
frame and press the shutter button
halfway to lock focus and exposure.
Focus and exposure will remain
locked while the shutter button is
pressed halfway (AF/AE lock).
2 Press the button all the way down.
N
Focus and exposure lock via the shutter button is only available
when
ON is selected for D BUTTON/DIAL SETTING > SHUTTER AF ,
SHUTTER AE .