Sony alpha ILCE-5100 Help Manual page 196

Help Guide
How to Use
Interchangeable Lens Digital Camera
ILCE-5100
Pre-AF (still image)
The product automatically adjusts focus before you press the shutter button halfway down.
1. MENU → (Custom Settings) → [
Menu item details
On (default setting):
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.
Pre-AF] → desired setting.
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