Gear
SUMMARY
The iPhone 18 Pro introduces a physical variable aperture, ranging from f/1.48 to f/4, a feature that has puzzled many. A professional photographer suggests the real reason is not for depth of field, which is largely dictated by sensor size, but to address lens quality limitations. Lenses perform poorly when wide open, and the variable aperture allows the iPhone to stop down for sharper images in good light. In low-light conditions, it opens fully to capture more light, accepting a slight hit in sharpness over the previous model's fixed aperture.
TAKEAWAYS
iPhone 18 Pro's variable aperture (f/1.48–f/4) is not primarily for depth of field.
The feature aims to improve lens quality by allowing it to stop down.
It enhances low-light performance by opening wide, compensating for sensor innovation limits.
The aperture offers about 2.9 stops of range, improving light gathering by up to 7.3x compared to f/4.