Apple announced the iPhone 18 Pro and 18 Pro Max on September 9, 2026, and the headline camera change is a genuinely physical one: a variable aperture that moves between four f-stops. It is the first time an iPhone main camera has had a moving aperture, and it is Pro-only. This guide covers what the feature actually does, what a moving part means if you plan to keep or resell the phone, and what the launch does to used iPhone 17 Pro and 16 Pro prices right now.
Quick Answer
The iPhone 18 Pro and 18 Pro Max use a 48MP main camera with a variable aperture that moves between f/1.48, f/1.8, f/2.8, and f/4.0 using six laser-cut blades. Wide open it gathers roughly 50% more light than the previous generation’s fixed f/1.78. It adjusts automatically and can be set manually in the Camera app. No other iPhone Apple sells has it. Apple did not announce a standard iPhone 18 in September, so the rest of the lineup is carryover: the iPhone 17, iPhone Air, iPhone 17e, and iPhone 16, all with fixed apertures. If you are shopping the secondary market, the more useful news is that a new Pro launch is the moment used prices on the outgoing models move. Shop used iPhones on Swappa.
What Apple Actually Announced
The variable aperture sits on the 48MP Fusion main camera of both Pro models. Instead of one fixed opening, it selects between four:
| Aperture | What it is for |
|---|---|
| f/1.48 | Maximum light, shallowest depth of field. Low light and portraits. |
| f/1.8 | General-purpose, close to previous iPhone behavior. |
| f/2.8 | More of the frame in focus. Groups, detail shots. |
| f/4.0 | Deepest focus. Landscapes and architecture. |
Apple built the mechanism from six laser-cut blades, each described as thinner than a human hair and made from a polymer composite chosen to balance mass, flexibility, and durability. The aperture adjusts on its own based on the scene, and it can be driven manually in the Camera app. Apple also opened an API so third-party camera apps can control it.
It arrives alongside a broader set of manual controls: white balance, shutter speed, aperture, and a live histogram.
Two details matter more than the spec sheet. First, this is a Pro-only feature, and this year that means only the two phones announced on September 9. Apple did not launch a standard iPhone 18 alongside them. The rest of the autumn lineup is carryover hardware, the iPhone 17, iPhone Air, iPhone 17e, and iPhone 16, and every one of them keeps a fixed aperture. A standard iPhone 18, an iPhone 18e, and a second-generation iPhone Air are expected in spring 2027. Most of the camera software changes announced this year do reach older models, but the moving aperture is the hardware line Apple drew. Second, the iPhone 18 Pro starts at $1,199 and the Pro Max at $1,299, so the feature carries a flagship price for at least a year. The rest of what changed this generation, and the upgrade math by model, is in iPhone 18 Pro and iPhone Duo: What’s New and Is It Worth It?.
What a Variable Aperture Does in Practice
On a traditional camera, aperture controls two things at once: how much light reaches the sensor, and how much of the scene is in focus. Phones have historically faked the second part in software. Portrait mode is an algorithm deciding what to blur.
A physical aperture does it optically. At f/1.48 you get real background separation and real low-light capability. At f/4.0 you get a genuinely deep focus plane, which is the shot phones have always struggled with when you want a whole landscape sharp from front to back.
For most people shooting on auto, the practical gain is low light. Roughly 50% more light than the previous generation is a meaningful jump for indoor and night photos, and it happens without you touching anything.
For anyone who shoots deliberately, the gain is control. Being able to stop down to f/4.0 and know the whole frame is sharp is a different tool than asking software to guess. If you have been carrying a used mirrorless body for that reason, it is worth reading our guide to Best Used Cameras for Beginners (2026) before deciding a phone replaces it. For most travel and family shooting it still does not, but the gap narrowed.
The Moving Part: What It Means for Long-Term Durability
This is the part worth thinking about if you buy used, sell used, or simply keep phones a long time.
Every iPhone main camera before this had a fixed aperture. Nothing in the optical path moved except the lens elements for focus and stabilization. The iPhone 18 Pro adds six moving blades driven by a rotor.
Moving parts are a new failure surface. The concern raised at launch is straightforward: repeated drops could jam the rotor or knock a blade out of alignment. To be clear about the evidence, this is a theoretical concern, not a documented failure rate. Comparable variable-aperture systems have shipped on other phones without a known reliability problem, and Apple will have tested the mechanism hard before shipping it.
Apple did harden everything around it, with a sapphire crystal lens cover and a second-generation Ceramic Shield front that it rates at three times better scratch resistance. What is fair to say is that the iPhone 18 Pro has a camera component that can fail mechanically in a way older iPhones could not. On a phone bought new and kept two years, that is close to irrelevant. On a three-year-old handset bought secondhand from a stranger, it is one more thing to check. That is a real change to the used-buying checklist, and it will stay true for years.
For how repair economics work when something like this does fail, see Repair vs Replace: When Fixing Tech Is Worth It.
How to Test a Variable Aperture on a Used iPhone
You will not need this for a while. Used iPhone 18 Pro supply will not be meaningful until well into 2027. When it is, the check is quick, and it is worth adding to your normal inspection routine.
- Confirm the model first. In Settings > General > About, a US iPhone 18 Pro reads model A3472 and a Pro Max reads A3473. Apple lists the numbers for every region in Identify your iPhone model. No other iPhone has the moving aperture, so if the number does not match, nothing below applies.
- Open the Camera app and switch to manual aperture control. Step through all four stops one at a time.
- Watch the preview. Depth of field should visibly change as you move from f/1.48 to f/4.0. Point at something close with a distant background to make it obvious.
- Listen. The mechanism should be effectively silent. Grinding, ticking, or a stutter as it moves is a red flag.
- Shoot one frame at each stop and compare. All four should be evenly exposed and sharp. A blade stuck partly closed usually shows as vignetting or a soft, uneven corner.
- Check it after a temperature change. Take the phone from cold to warm and repeat. Mechanical faults often show up only at one end of the range.
If any stop refuses to engage, or the phone silently stays at one aperture, treat it as a camera fault and price accordingly.
This sits alongside the checks you should already be making on any used iPhone: battery health, Activation Lock status, and a clean IMEI. Our Used Device Pre-Purchase Checklist covers the full routine, and iPhone Battery Health: What to Check on a Used iPhone covers the one buyers most often skip.
Buying somewhere with staff-reviewed listings removes some of this burden. Every device listed on Swappa is reviewed before it goes live, must have a clean IMEI and be ready to activate, and cannot have an active Activation Lock. If a device arrives not as advertised, you are entitled to a refund.
What This Does to Used iPhone 17 Pro and 16 Pro Prices
Here is the part that affects you today, whether or not you ever buy an iPhone 18 Pro.
A flagship launch is normally the most predictable moment in the used phone market. Two things happen at once. Upgraders list their outgoing handsets, so supply of the previous generation jumps. At the same time, the previous generation stops being the newest thing, so demand cools slightly. More supply plus flatter demand moves prices down.
This launch came with a counterweight, and it is large enough that the usual conclusion does not hold. On launch day Apple raised the price of every carryover iPhone by $100, citing memory and storage chip costs, and discontinued the iPhone 17 Pro and Pro Max outright. Both moves push the opposite way. A higher new-phone floor widens the savings on a used handset rather than shrinking it, and a Pro model Apple no longer sells at retail exists only on the secondary market, so demand for it holds up better than it usually would a year into its life.
So the supply bump on the 17 Pro and 16 Pro is real, but it is landing against a new lineup that got more expensive on the same day, not a cheaper one. Used phones generally run 30% to 60% below new, and it is that spread, not the used price on its own, that moved this week. The model-by-model pricing math belongs to iPhone 17 Price Increase: What It Means for Used Buyers, which is worth reading before you assume last year’s flagship simply got cheaper. Prices move constantly, so check live numbers rather than trusting any figure in an article:
| Model | Why it is worth a look now |
|---|---|
| iPhone 17 Pro | The direct predecessor. Largest supply bump, fixed f/1.78 main camera. |
| iPhone 17 Pro Max | Same camera as the 17 Pro with the bigger battery and screen. |
| iPhone 16 Pro | Two generations back. Steeper discount, still a capable camera. |
| iPhone 16 Pro Max | Best price per feature if screen size matters more than the newest sensor. |
The buying case is straightforward. If the variable aperture is not something you will use deliberately, a used iPhone 17 Pro does nearly everything the 18 Pro does for meaningfully less, and it does it without a moving part in the camera. That is close to literal: the two share display sizes and the same 48MP telephoto, so the aperture, the chip, and the battery are the whole of the gap. If you want that worked through by budget rather than by feature, iPhone 18 Pro vs. Used iPhone 16 and 17: Which to Buy runs the price bands and the cost-per-year math.
If you are on the other side and upgrading, timing matters. Selling before the market fills with identical listings gets you more than selling into the glut a month later. Our guide to The Best Time to Sell Electronics covers how those windows work across categories, and you can sell your iPhone on Swappa when you are ready. Listing is free, and the seller fee is 3% of your asking price, which is lower than typical auction-site fees.
Frequently Asked Questions
Which iPhones have a variable aperture?
Only the iPhone 18 Pro and iPhone 18 Pro Max. Apple did not announce a standard iPhone 18 at its September 2026 event, so the other iPhones on sale are carryover models, the iPhone 17, iPhone Air, iPhone 17e, and iPhone 16, and all of them use a fixed aperture. Most of the camera software improvements announced alongside the Pro models, including the expanded manual controls, reach other iPhones, but the moving aperture is Pro-only hardware.
What are the iPhone 18 Pro’s aperture settings?
Four: f/1.48, f/1.8, f/2.8, and f/4.0. The camera selects between them automatically based on the scene, and you can set the aperture manually in the Camera app. Apple also released an API so third-party camera apps can control it.
Is the variable aperture likely to break?
There is no evidence that it will. It is a mechanical system of six blades driven by a rotor, so unlike a fixed aperture it can in principle jam or misalign after repeated drops. That concern is theoretical at launch, and similar systems on other phones have not shown a known reliability problem. It is worth testing on a used unit, not worth avoiding the phone over.
Should I buy a used iPhone 17 Pro instead?
For most people, yes. The iPhone 17 Pro takes excellent photos, costs meaningfully less on the secondary market, and has no moving aperture to worry about. Buy the 18 Pro if you shoot deliberately and will actually use manual aperture control. Otherwise the value is on the outgoing model, especially in the weeks right after a launch.
Will the iPhone 18 Pro launch lower used iPhone prices?
Not the way a launch usually does. Supply of last year’s phone does rise as upgraders sell, which puts some downward pressure on used iPhone 17 Pro and 16 Pro prices. Working against it, Apple raised every carryover iPhone by $100 on launch day and discontinued the iPhone 17 Pro line, which lifts the new-phone floor and widens used savings rather than depressing used values. The pricing math is covered in iPhone 17 Price Increase: What It Means for Used Buyers. Check live listings rather than relying on a fixed figure, since prices move constantly.
When will used iPhone 18 Pro units be available?
Not in any real volume for a while. Meaningful secondary-market supply of a new flagship generally takes several months to build, and usually arrives once the first wave of upgraders and returns cycles through. Expect thin, expensive listings before then.
The Bottom Line
The variable aperture is the most interesting thing Apple has done to an iPhone camera in years, and it is a real optical capability rather than a software effect. It is also a moving part in a device people keep for years and then resell, which adds one line to the used-buying checklist that was not there before.
For most buyers reading this today, the practical takeaway is not about the iPhone 18 Pro at all. It is that the used iPhone 17 Pro and 16 Pro are better value than they were last week, and that has less to do with the 18 Pro than with Apple raising the price of every new iPhone it kept and discontinuing the 17 Pro line. For where each generation lands once the launch dust settles, see Used iPhone Buyer’s Guide: Every Generation Ranked (2026).
