FujiFilm X100V Owner's Manual page 94

Quick Focus
•
To use autofocus to focus on the subject in the selected focus area, press
the button to which focus lock or AF-ON has been assigned (the size of
the focus area can be chosen with the rear command dial).
•
In manual focus mode, you can use this feature to quickly focus on a cho-
sen subject using either single or continuous AF according to the option
chosen for G AF/MF SETTING > INSTANT AF SETTING.
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