FujiFilm GFX 50s Manual page 17

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The face selected by the camera is indicated by a green border.
If there is more than one face in the frame, the camera will select the
face closest to the center; other faces are indicated by white borders.
If the selected subject leaves the frame, the camera will wait a set time
for its return and consequently the green frame may sometimes ap-
pear in locations where no face is seen.
Depending on shooting conditions, face selection may be suspended
at the close of burst shooting.
Faces can be detected with the camera in vertical or horizontal orien-
tation.
If the camera is unable to detect the subject's eyes because they are
hidden by hair, glasses, or other objects, the camera will instead focus
on faces.
Face/eye detection options can also be accessed via shortcuts.
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