The new iPhone 18 Pro features an adjustable mechanical iris and expanded manual camera controls, though the f/1.48 maximum aperture may be the more significant update for users.

Apple has introduced a variable aperture system for the iPhone 18 Pro and Pro Max, allowing users to adjust the main camera's iris between f/1.48, f/1.8, f/2.8, and f/4. This hardware change is accompanied by new native camera app features that provide manual control over shutter speed, white balance, and focus. While the variable aperture allows for more depth of field in specific scenarios, the device's f/1.48 maximum aperture is expected to offer improved low-light performance and shallower depth of field.

New Manual Camera Controls

The iPhone 18 Pro integrates manual photography controls directly into the native camera app, a functionality previously requiring third-party applications like Halide. Users can now manually adjust shutter speeds, white balance, and focus settings alongside the new aperture controls.

Variable Aperture Utility

The variable aperture system uses laser-cut blades described by Apple as thinner than human hair. While stopping down to f/4 can increase depth of field for close-up subjects or group shots and assist in bright lighting conditions, it may also introduce lens diffraction that can reduce image sharpness compared to wider settings.

Low-Light and Bokeh Performance

The shift from the previous generation's f/1.7 aperture to the new f/1.48 maximum aperture is intended to enhance low-light capabilities and create a shallower depth of field. This change aims to provide a more pronounced bokeh effect, which is often sought after for portrait photography.