iPhone 18 Pro's Variable Aperture: Four Settings From f/1.48 to f/4
The iPhone 18 Pro and Pro Max feature a variable aperture on the 48MP Fusion Main camera with four manual settings: f/1.48, f/1.8, f/2.8, and f/4. The mechanism physically changes the lens opening to control light and depth of field; tests found peak sharpness at f/2.8, with diffraction softening f/4.
- Aperture applies only to the 48MP Main camera, including the 2x crop
- Going from f/1.48 to f/4 cuts light by about three stops
- PetaPixel: sharpest at f/2.8, softer at f/4 due to diffraction
- Blackmagic Camera 3.5 adds manual aperture control
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