The variable aperture isn’t the cool part of the iPhone 18 Pro’s camera
Apple's iPhone 18 Pro and Pro Max introduce a variable mechanical aperture in their main camera, alongside manual controls for shutter speed, white balance and focus that were previously only available through third-party apps such as Halide. However, this article argues the adjustable aperture is unlikely to be the standout feature, since smartphone sensors are too small for stopping down to noticeably sharpen images the way it does on larger cameras, and other manufacturers such as Samsung and Xiaomi have already tried and abandoned similar features.
The more significant upgrade, the piece contends, is the camera's widest setting of f/1.48, up from f/1.7 on last year's Pro models, which should improve low-light performance and produce a slightly shallower depth of field for more pronounced background blur in portraits. The new aperture range spans f/1.48 to f/4, but at f/4 lens diffraction could actually reduce sharpness rather than improve it, with benefits limited to niche cases like close-up depth of field, large group shots or filming video in very bright conditions.
- iPhone 18 Pro adds a variable aperture (f/1.48-f/4) and manual camera controls
- Author argues the wider f/1.48 maximum, not variable aperture, is the real highlight
- Other brands dropped variable apertures as smartphone sensors limit their benefit
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Apple's iPhone 18 Pro and Pro Max have launched with an updated main camera, including a variable aperture, a feature that lets the lens opening widen or narrow to control how much light enters, something previously found mainly on dedicated cameras rather than phones. The new models also gain manual controls over shutter speed, white balance and focus, tools that iPhone users previously had to find in separate apps rather than Apple's own camera software.
The debate around this launch centres on which change actually matters most to photo quality. A variable aperture sounds like a headline feature, but because phone camera sensors are so small, narrowing the aperture does not sharpen images the way it does on larger cameras, and rival phone makers including Samsung and Xiaomi have previously added similar features before dropping them.
This context matters because it shapes how the iPhone 18 Pro's camera improvements should be judged against past models and competitors. Understanding what a wider or narrower aperture setting actually changes, and where its practical benefits and limits lie, helps explain why some of the phone's less prominently marketed specification changes could end up affecting everyday photos more than the headline feature.