What Is Autofocus?

Is more AF points always better?

Coverage and stickiness matter more than the headline count. Watch real tracking clips.

Does eye AF work through glasses or helmets?

Often, not always. Brand and firmware vary — test your typical kit.

Why does video AF pulse?

Contrast refine or slow motors can breathe. Try AF speed/sensitivity settings or manual focus.

Can IBIS replace good AF?

No. IBIS fights shake; AF fights soft subjects. You usually want both for handheld video.

Related terms

• Depth of field
• Aperture
• Focal length
• IBIS
• Megapixels
• Cameras Knowledge Base

Editorial note: AF modes, subject types, and video AF behavior change with firmware and lens. Confirm the combo you will actually buy. Part of the Gadget Clash Knowledge Base (Cameras).