Which iPhone 18 Pro camera has the variable aperture?

The 48MP Fusion main camera. Apple did not announce aperture changes for the ultra wide or telephoto cameras. The 18 Pro and 18 Pro Max share the same main camera hardware.

What was the iPhone 17 Pro's aperture?

It was fixed at f/1.78. The 18 Pro supports four settings from f/1.48 to f/4, so it can open wider in dim light and close down for landscapes.

Can you control the aperture manually?

Yes. Apple says the Pro controls in the Camera app let you adjust lens aperture, shutter speed and white balance, and a histogram helps check exposure. By default, the camera handles it automatically.

Is the iPhone 18 Pro the first phone with a variable aperture?

No. Samsung's Galaxy S9 and S10 switched between f/1.5 and f/2.4, and the Xiaomi 14 Ultra offers f/1.63 to f/4.0. It is the first time the feature has appeared in an iPhone.

Should iPhone 17 Pro owners upgrade for the camera?

If you shoot often at night or take many portraits and group photos, the difference may be noticeable. For everyday snapshots, f/1.8 is close to the 17 Pro's f/1.78, so the gain is smaller. The $100 price increase is worth weighing too.

iPhone 18 Pro Variable Aperture vs 17 Pro: Photo Changes

What is different about the iPhone 18 Pro's variable aperture?

The biggest change is that the main camera's aperture is no longer fixed. The iPhone 17 Pro's 48MP main camera stayed at f/1.78. The iPhone 18 Pro, according to Apple, offers four settings: f/1.48, f/1.8, f/2.8 and f/4. Aperture is the opening that controls how much light reaches the sensor, and a smaller f-number means a wider opening. Apple says six laser-cut blades move on a rotor mechanism to change the opening, and the camera can choose automatically or let you pick manually.

When should you use each of the four aperture settings?

The table below summarizes how each setting is meant to be used, based on Apple's and press descriptions. Wider settings help in dim light and for background blur; narrower ones keep more of the scene sharp.

Aperture	Opening	Best for	Note
f/1.48	Widest	Night and indoor shots, background blur	Slight sharpness loss from aberrations
f/1.8	Wide	Everyday shooting	Apple's preferred balance of sharpness and light
f/2.8	Medium	Portraits, shots with several people	Larger zone in focus
f/4	Narrow	Landscapes, group photos	Slight sharpness loss from diffraction

Because the 17 Pro's f/1.78 and the 18 Pro's f/1.8 are nearly the same, everyday snapshots may not look very different. The gain comes from the options above and below that value.

Why did Apple choose a variable aperture instead of a bigger sensor?

Apple says the starting goal was better low-light sensitivity. A larger sensor needs more space and power, so the company went for a faster lens instead. The catch is that a lens that is always wide open loses sharpness on anything behind a close subject. A lens that can stop down solves that, which is why Apple built a variable design, as PetaPixel reported. The blades are said to be made from a polymer composite, each thinner than a human hair, and the opening changes smoothly rather than in fixed jumps.

What changes in real photos?

By a simple calculation, f/1.48 admits roughly 1.4 times more light than f/1.78 (comparing the inverse squares of the f-numbers; this is Gist7's own arithmetic). That helps keep noise down or shutter speeds up in dark scenes. Stopping down to f/4 does the opposite for focus: a deeper zone in front of and behind the subject stays sharp. DXOMARK credited the feature with keeping every face sharp in group portraits, and it scored the camera 172 points, second place in its global ranking. Until now, iPhones created most portrait background blur in software. Now the blur can start at the lens, before the image is processed.

What are the limits and caveats?

DXOMARK noted that flare can still show up when the iris closes, and that portrait background blur occasionally fails in very low light. Reports also describe the feature as applying to the main camera only, so the ultra wide and telephoto lenses are not variable. Nor is the idea new in phones: Samsung's Galaxy S9 and S10 switched between f/1.5 and f/2.4 before the company dropped it, and the Xiaomi 14 Ultra offers f/1.63 to f/4.0, according to Engadget. What is new is seeing it in an iPhone.

Why this matters

It signals that smartphone camera competition is moving from sensor size and megapixels toward finer optical engineering. For people with a 17 Pro, the reason to upgrade depends on how they shoot. If you often take night photos or portraits and group shots, the difference may be noticeable. If you mostly take daytime snapshots, it may not be. Pricing also counts: the iPhone 18 Pro starts at $1,199 in the US, $100 more than the 17 Pro's $1,099, according to Tom's Guide and Apple.

What to watch next

Apple says developers get API access to the camera controls, so the first thing to watch is how third-party camera apps use manual aperture. Long-term reviews will show how the blades hold up and how well flare is handled. It is also worth watching whether Apple extends the idea to other lenses in a future generation.