Pre-Af (Still Image); Eye-Start Af (Still Image) - Sony ILCE-6500 Manual

The [Center Lock-on AF] function may not function very well in the following situations:
The subject is moving too quickly.
The subject is too small, or too large.
The contrast between the subject and the background is poor.
It is dark.
The ambient light changes.
Lock-on AF does not work in the following situations:
[Sweep Panorama]
When [Scene Selection] is set to [Hand-held Twilight] or [Anti Motion Blur].
When shooting in Manual Focus mode.
When using the digital zoom
When [ Record Setting] is set to [120p]/[100p].
[40] Shooting Auto focus

Pre-AF (still image)

The product automatically adjusts focus before you press the shutter button halfway down.
MENU →
1
Menu item details
On:
Adjusts focus before you press the shutter button halfway down.
Off:
Does not adjust focus before you press the shutter button halfway down.
Note
[ Pre-AF] is available only when an E-mount lens is mounted.
[41] Shooting Auto focus

Eye-Start AF (still image)

Sets whether or not to use autofocus when you look through an Electronic Viewfinder.
MENU →
1
(Camera Settings1) → [
(Camera Settings1) → [
Pre-AF] → desired setting.
Eye-Start AF] → desired setting.