On iPhone 18 Pro, an aperture you set by hand doesn’t survive closing Camera: Apple’s guide says the setting is reset the next time you open the app. To keep it, go to Settings > Camera > Preserve Settings and turn on Lens Aperture.
Nothing is wrong with the phone. Apple’s iPhone User Guide spells out the fix: “To save the aperture setting so it’s not reset the next time you open Camera, turn on Lens Aperture in Preserve Settings.” Of the switches on that screen, Apple marks only Portrait Zoom and Live Photo as on by default.
What the variable aperture does
The aperture is the opening that lets light into the lens, and the 48MP Fusion Main camera on iPhone 18 Pro can change its size: wide open at f/1.48 to gather light indoors, or narrowed to f/2.8 or f/4.0 to keep more of the scene sharp, with f/1.8 in between. Apple says it “adjusts for lighting and depth of field automatically,” so you only need the manual control when you want a specific look, and our variable aperture explainer covers each stop.
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Set the aperture yourself
Lens Aperture is one of the Pro controls on iPhone 18 Pro models, and Apple says manual settings work in Photo, Video, Cinematic, Slo-mo and Time-Lapse modes. The Ultra Wide and Telephoto cameras have fixed apertures.
- Open Camera.
- Tap the Camera Controls button, then tap Lens Aperture.
- Tap the aperture value you want.
Shutter Speed and White Balance sit in the same menu. White Balance also works with a tap on a value, while Shutter Speed uses a slider.
Stop Camera from resetting it
- Open the Settings app and tap Camera.
- Tap Preserve Settings.
- Turn on Lens Aperture.
Apple describes the switch as saving “the last aperture setting you used.” Camera reopens at whatever you picked most recently, not at a favorite you lock in. Shoot a landscape at f/4.0, then a dinner photo at f/1.48, and Camera comes back at f/1.48.
The same screen fixes similar annoyances with other settings:
- Exposure Adjustment saves the exposure control setting, which otherwise stays locked only until you next open Camera.
- Photographic Style keeps your last style instead of dropping it when Camera closes.
- Night Mode saves the Night mode setting rather than resetting to Auto.
- Camera Mode reopens Camera in the last mode you used, such as Portrait or Pano.
Keep Lens Aperture one tap away
Digging into the menu for every shot gets old. In iOS 27 you can pin Lens Aperture above the camera frame: tap the Camera Controls button, tap Edit, tap Lens Aperture, then tap Done. Apple’s guide says Shutter Speed, White Balance and Histogram can go there too.
These controls are for iPhone 18 Pro models only. Apple’s store comparison lists “No Pro controls” and no variable aperture for iPhone Duo.
