Sony Cyber-shot DSC-HX99 Help Manual page 340

Help Guide
Digital Still Camera
DSC-HX99
Pre-AF (still image)
The product automatically adjusts focus before you press the shutter button halfway down. During focusing operations,
the screen may shake.
MENU → (Camera Settings1) → [ Pre-AF] → desired setting.
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.
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