Why does the iPhone 18 Pro camera have tiny blades inside it?

The six blades create a real variable aperture, giving the camera optical control over incoming light and depth of field.

Six laser-cut blades in the 48MP Fusion camera physically change the opening from f/1.48 to f/4—the first real variable aperture in an iPhone. Open it wide for more light and stronger natural background separation; close it down in bright scenes to keep more of the frame sharp and protect highlights. That optical control happens before software blur is added, so hair, glass, and object edges can look more convincing.

It matters most to low-light shooters, close-up photographers, and video creators who want exposure changes without changing shutter speed.

Why a mechanical iris matters in a phone

Phone cameras have always shot wide open, letting software fake background blur afterward. A real variable aperture — tiny blades that physically narrow the opening — changes the light itself before it hits the sensor: sharper results in bright sun, true depth-of-field control, and better video exposure without shutter-speed tricks.

What to do, step by step

1. In bright light, a narrower aperture (higher f-number) keeps highlights from blowing out — no filter needed.
2. For portraits, the widest setting gives real optical blur, which separates hair and glasses edges better than software cutouts.
3. Video shooters gain most: aperture control replaces the ND filters creators tape onto phones to film in daylight.