The variable aperture isn’t the cool part of the iPhone 18 Pro’s camera

Apple's new iPhone 18 Pro and Pro Max put an adjustable mechanical iris at the center of the marketing for their main camera modules. The built-in variable aperture lets the camera open or close to one of four fixed stops — f/1.48, f/1.8, f/2.8, and f/4 — to control how much light reaches the sensor. The company also highlighted hardware details at the launch: the aperture uses six blades and Apple said the blades are laser-cut to a thickness finer than human hair. The main sensor on the Pro models is 48 megapixels, and the variable iris sits in that primary (bottom) camera housing. Alongside the mechanical aperture, Apple has added a broader set of pro controls to the native Camera app. Users can now select aperture manually or leave it on automatic, and they can also set shutter speeds, tweak white balance, and perform manual focusing — features that previously often required third-party apps such as Halide. Despite the headline-grabbing variable aperture, The Verge advises tempering expectations about how transformative the feature will be in practice, describing it as likely to be "mid, at best." While the expanded manual controls are a notable change for the iPhone’s stock camera software, the variable iris itself may not be the standout upgrade for everyday shooting.