Halide Unlocks Continuous Aperture Control on iPhone 18 Pro
Lux Optics has updated Halide for iPhone and iPad to support the variable aperture in the iPhone 18 Pro main camera. The update was detailed on Sept. 30. The Verge
Halide Mark III lets users select any f-stop from f/1.48 to f/4.0. The range is continuous. Apple's built-in iOS camera app limits aperture adjustment to four presets. Blackmagic Camera and Moment Pro Camera II each offer 10 aperture presets in 1/3-stop increments.
That difference is the core of this release. Where the stock app constrains choice to four positions and other pro video-oriented apps quantize control into third-stop steps, Halide exposes the iris as a freely settable parameter. For an expert user, the practical effect is direct selection rather than stepping through a short list.
The update also adds two photography looks. Dawn applies filmic warmth in mid-tones and highlights with gentle, rich shadows. Quicksilver pairs high contrast with muted color, inspired by silver-retention processes.
The hardware underneath is Apple's 48MP Fusion Main camera with variable aperture on the iPhone 18 Pro and iPhone 18 Pro Max. Apple Apple states the variable-aperture Fusion Main camera brings aperture control to iPhone. Apple also states it is the most advanced camera it has ever made. The Pro models include a new Fusion Main sensor and Apple's Reference Image provenance tool. The built-in Camera app includes manual controls for the variable-aperture lens.
Apple is extending that control across its own software as well. Its Final Cut Camera app supports variable aperture on iPhone 18 Pro. That update was released alongside iOS 27. Apple
Looking at what this means for mobile imaging, granularity is becoming the point of differentiation. The aperture itself is no longer exclusive to one app. What varies is how precisely a photographer can set it. Four presets cover broad intent. Ten third-stop presets map better to the way stills shooters think about exposure. Continuous control from f/1.48 to f/4.0 removes the preset abstraction entirely.
In my view, that progression will matter more as variable aperture becomes a normal phone specification rather than a novelty. Third-party cameras on iOS have long competed on manual access, focus peaking, zebras, waveform, and file handling. Aperture resolution now joins that list. For users who already meter, bracket, and grade with intent, the ability to dial an exact value and pair it with a defined look is more useful than another automatic mode. It makes the phone behave a little more like a system camera, and gives careful work a better chance of surviving intact from capture to edit.
