Sigma FP User Manual page 57

CAUTION
If a lens with manual fine-adjustment enabled is attached via the mount
converter MC-21, it is always possible to make fine adjustments even if the
camera is set to [Off].
PRE-AF
(STILL)
AF mode is activated before the shutter button is half-pressed.
SHOOT] → [Focus] → [Pre-AF] → [On]
[
CONSTANT AF
(CINE)
AF mode is activated before movie recording, and it continues to operate
even when a movie is being recorded.
[ SHOOT] → [Focus] → [Constant AF] → [On]
FACE / EYE DETECTION AF
Preferentially focuses the face or eye of a person.
Press the button and then press the
the AEL button, you can switch between Face Only and Face/Eye
Detection AF.
Otherwise, to set this mode, select [
Eye Detection AF].
Off (Default)
Face Only
Face / Eye Auto
/ SHOOT] → [Focus] → [Face /
Sets to the normal AF mode.
When a face is detected, it is focused on
preferentially.
When a face is detected, it is focused on
preferentially, and when an eye is detected,
it is focused on.
button. Each time you press
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