The iPhone 18 Pro’s little mechanical pupil is irresistible. A bunch of moving parts make for a good excuse to put our brand new camera under the microscope.
We weren’t prepared for the screen’s plastic frame to tear apart on three of the four phones we opened, though. More on that later.
There’s plenty to admire inside the iPhone 18 Pro and Pro Max, from that intricate variable aperture to a screwed-in battery tray and a much larger cooling system. There are also some uncomfortable repair tradeoffs. This year’s updated camera is a good place to start: what does its new mechanism buy you, and how difficult and expensive will repairs be if one tiny blade gets stuck?
Welcome to the Aperture Science Repair Laboratory
Apple leaned hard on the capabilities of the main camera in their Hollywood-themed keynote, which was shot entirely on an iPhone 18 Pro.
Is the variable aperture worth an upgrade? Unlikely. If you really care about variable aperture, you’ve probably already got an actual, non-smartphone camera that does a better job of it. If you’re considering upgrading from another recent-model iPhone, the photo quality differences are small enough that most people probably won’t notice. We say it every year, and it’s especially true this year: skip the upgrade. The most sustainable phone is the one already in your pocket.
Still, you know when we heard that the iPhone 18 Pro and Pro Max had a main camera with a variable aperture lens, our spudgers started dancing in anticipation.
As soon as we could, we pulled the phone apart, yanked the main camera out, and heated and pried (and heated and pried) until the lens cover popped off and little aperture blades flew across the teardown room. Here it is: the iPhone’s first-ever winking eye.
Now, of course, variable aperture isn’t new. It’s par for the course for nearly every optical system larger than a smartphone camera. Two guys named Harrison and Schnitzer patented an overlapping-blade photographic diaphragm in 1858, the same year John Mason patented the jars in your grandma’s pantry. It’s not even the first variable aperture in a smartphone: Nokia did it in the N86 in 2009, we saw it in Samsung’s Galaxy S9 in 2018, and it’s showed up in more recent models from Huawei and Xiaomi. Apple’s a little late to the game.
That means we already know some of the ways these mechanisms go wrong. Some Galaxy users have reported stuck apertures. And people who fix cameras know how oil migrating onto aperture blades can cause trouble. As a good rule of thumb, more moving parts means more failure risk. That doesn’t mean the new iPhone is doomed. It just means the path to replacement matters.
In true Apple fashion, they’ve brought smart engineering and thoughtful design into the space. The new variable aperture lens is a feat of precision engineering. It has to be at this scale. The mechanism packs six tiny overlapping “polymer composite” leaf-like blades into the same main camera footprint as last year, everything cooperating to let more or less light into the lens.
Magnetism drives the movement. We can trigger the actuation by putting a magnet near the aperture: it opens and closes, even with supporting hardware removed. The shape and movement of the blades keep the opening almost completely round, although minor imperfections can cause a noticeable starburst effect. More blades mean a smoother circle. Apple settled on six for this application. Any more would probably be overkill.
The scale of the aperture blades is absurd. Each blade is about as thin as a human hair, as seen side-by-side under our Evident DSX2000 microscope.
The aperture blades feature clusters of tiny slots and holes that engage pins on the drive mechanism.
All six blades have to move past one another without snagging. The blade pivots on that outermost round hole, slides along a pin in the middle slot, and catches back on the notch on the edge of the blade. This is precision machinery with very little room for a bent blade or a misplaced speck.
Okay, but can you fix it? By this point, you can probably guess: very few repair enthusiasts on this planet will have the tools, techniques, or knowledge to get this variable aperture mechanism apart in a way that allows it to go back together. The tolerances are tight, the glues are gummy. We’re reluctant to call a repair “impossible,” but this is about as close as it gets.
That means any damage to your main camera will probably mean replacing the whole assembly, which is bound to be expensive. This has been true, of course, for a long time; we expect and accept that cameras come in assemblies not intended for user servicing. The variable aperture just adds more potential modes of failure and a higher component cost. Apple hasn’t released parts yet, but the camera assembly for the 17 Pro is $249, and the variable aperture will only up that cost.
The good news: the camera assembly is modular and relatively easy to access. Aside from our complaints about the screen (are you interested yet?), we’re glad to report it’s painless to swap out a main camera module on both the 18 Pro and Pro Max.
Why Bother with Aperture Control on a Smartphone?
Why bother with aperture control on a smartphone? No, really, that’s not a rhetorical question. Samsung tried it and dropped it, citing “limited functional benefit at smartphone camera levels,” and we basically agree.
A lot of reviewers are talking about the aperture feature enabling more control over depth of field, how much of the scene looks acceptably sharp in front of and behind the distance you focused on. We’re skeptical that with a tiny sensor and short lens, the difference in aperture will make a significant difference in background blur.
The iPhone light sensor is tiny, a little less than a half inch diagonal, and the lens has a focal length of just 6.8 mm.
The iPhone 18 Pro and Pro Max’s camera app has four preset aperture settings: ƒ/1.48, ƒ/1.8, ƒ/2.8, and ƒ/4.0, from widest to narrowest. It’ll probably be fluidly adjustable with third-party apps.
The ƒ/1.48 opening is the widest aperture on an iPhone camera ever, and it’s half a stop wider than the 17 Pro (though only a little bit wider than the 13 Pro’s ƒ/1.5). But ƒ-stop is a ratio of the focal length divided by the apparent opening’s diameter. It’s not an absolute measure of aperture size.
On the iPhone 18 Pro and Pro Max main camera, we’re talking about a 4.6 mm opening at ƒ/1.48. Although that’s big for an iPhone, it’s small compared to dedicated photography equipment, and the biggest possible background blur is accordingly small. When I take a picture with my DSLR and a 50 mm lens, for comparison, ƒ/1.48 means a 33.8 mm opening.
In both cases, having the aperture open to ƒ/1.48 means about 7.3 times more light hitting the sensor than at ƒ/4.0. However, at its widest, the iPhone aperture is still 29.2 mm smaller than the same ƒ-stop on my DSLR. Fully open, the iPhone background stays pretty sharp. You’re not going to get those big pretty bokeh circles that people think of when they say “wide aperture.”
Here are four photos taken with the iPhone 18 Pro, focused on the camera in the foreground. Starting with the smallest aperture and stopping down, from left to right: ƒ/4.0, ƒ/2.8, ƒ/1.8, and ƒ/1.48. There’s a difference, yes. But even at the widest, the iFixit logo in the background and toolkits on the wall are still legible.
Stopping down makes the image a little sharper. But this variable aperture control seems, today, like it adds a lot of very tiny points of potential failure for very little benefit. Maybe Apple’s just thinking ahead? A bigger lens and bigger sensor could make aperture control more useful. Or maybe it’s just a marketing gimmick or a new feature for us all to dissect (in which case, touché, John Apple).
A Good Battery Repair with a Bad Entrance
Even with the complex new camera mechanism, repair shops will do far fewer camera repairs than battery replacements.
A battery replacement should be routine, and we’re disappointed (but not surprised) to see the front-entry-only architecture of last year’s model continue on to the iPhone 18 Pro and Pro Max. There’s a back glass panel that opens easily, but there are no serviceable parts inside aside from the wireless charging coil embedded in the panel itself. Getting to the battery means opening the glued-down screen, which is where three of our four teardowns ran into trouble.
Our display panels survived removal and still work. The white plastic frame around them fared worse: it cracked or pulled away in three of our four openings. That frame is integral to the display assembly. Fresh perimeter adhesive won’t repair broken plastic, and we can’t count on a damaged frame to sit flush and seal properly afterward.
One phone came apart intact, and we’ve seen other teardowns avoid this damage. Four phones are too few to establish a failure rate. Adhesive strength, heating, technique, or a difference in the plastic could all matter.
That plastic frame has been present since the 15 Pro. But it hasn’t given us nearly as much trouble in previous years. Could the improved thermals be pulling too much heat away from the seam, preventing the adhesive from softening? The screen that came apart cleanly, we heated for 15 minutes at 70 degrees Celsius and then another 10 minutes at 72. That’s a lot of heat! Using isopropyl alcohol might make display removal more consistent, but we’ll have to do more testing to be sure.
Once we’re past the screen, though, we’re happy to see these phones inherited our favorite feature of last year’s model: a metal battery tray held down by screws. Remove the tray and battery together, and there’s no battery adhesive to fight. Thirteen screws? We’ll take them.
The cell itself is still glued into the tray. For anyone determined to separate the two, the electrically releasable adhesive works beautifully: about 90 seconds at 12 volts with FixHub and our VoltClip, and the battery lifts away cleanly. Replacement of the complete tray assembly doesn’t require that extra step.
Our eSIM-model iPhone 18 Pro battery is labeled 16.76 Wh (4288 mAh); the Pro Max’s is 21.751 Wh (5567 mAh). Physical SIM models have smaller batteries. The screwed-in tray is a repair win regardless of capacity, provided opening the phone doesn’t turn a battery job into a display job. We hate that the risk is there.
Better Cooling, Harder Access to Storage
While the battery tray is familiar, the layout of the logic board is new. The A20 Pro has moved to the outside of the board sandwich. Last year’s A19 Pro sat inside, with RAM stacked above it. The memory now sits beside the processor, too, clearing a more direct route from the hot chip to the cooling system. Apple describes that packaging change as part of the new thermal design, and it brings the A-series chip design closer to parity with the M-series.
The chip sits right up against the new and improved vapor chamber, with a spongy pad sandwiched in between.
Thermal interface material comes in lots of forms. In this case, a conformable interface fills the gap and helps conduct heat away from the A20 Pro evenly.
The vapor chamber then spreads that heat over a much larger area. Inside a sealed chamber, working fluid evaporates near the hot region. Vapor travels to cooler surfaces and condenses, releasing heat there. A wick draws the liquid back by capillary action, ready for another trip.
This year’s chamber extends across much of the phone’s body, and Apple specifies its surface area as three times larger. The beefy vapor chamber paired with the still-aluminum unibody enclosure make for some really impressive cooling.
Moving the SoC to the outside of the logic board makes the phone an even cooler cucumber. But there’s a repair consequence elsewhere on the board: NAND storage now sits inside the logic board sandwich. Detailed surgery that requires reaching those chips starts with separating the board layers, adding heat, labor, and an opportunity to damage something before the original fault is even addressed.
That distinction matters for data recovery, too. Data recovery specialists will usually troubleshoot and repair a corroded logic board until they can boot from it and back up. Because iPhone data protection depends on encryption, they can’t just transplant the NAND. Recovery work that does require access to the original NAND is now more involved.
Interestingly enough, all versions of the 18 Pro and Pro Max carry the new Apple-made C2 chips, except for the US model 18 Pro Max, which still uses a more power hungry Qualcomm mobile chip. The question is, why is Apple using Qualcomm’s silicon at all?
They clearly don’t need it. But several years ago, Apple apparently settled a feud with Qualcomm by agreeing to use their chips in at least some iPhones through 2026. Since Qualcomm’s chip is a little more power-hungry than the C2, it makes sense that Apple only uses it in the US-spec 18 Pro Max, which thanks to eSIM has the biggest battery of any iPhone in the lineup this year. So end users probably won’t notice any difference, and this will probably be the last Apple device to use a Qualcomm chip.
Face ID Ducks Under the Display
The infrared camera has moved beneath the screen, toward the upper-left corner. The selfie camera and infrared dot projector remain in the central opening. Moving one component out of the way gives the Dynamic Island less hardware to hide.
With the naked eye, the punch is barely visible as a dimmer circle of pixels, just to the left of the time at the top of the display.
Under the microscope, the distinction gets clearer.
As we zoom in further, the trick is revealed. Over the infrared camera, every other row of display pixels is missing. The pattern transitions around the edge, making the opening much less obvious to the naked eye than it is under magnification.
This is the same way Samsung hid a camera under the screen of the Z Fold4, 5, and 6. But the images would get distorted by the grid of pixels on top, a problem they tried to solve with AI image reconstruction.
Apple has put the infrared camera through this optical obstacle while leaving the selfie camera’s view clear. Face ID still needs a usable signal, but it doesn’t have to deliver a full-color photograph you’d want to keep.
Below the OLED, we also see what appears to be an infrared-pass filter. Its edge produces a striking eclipse effect under the microscope, which we turned into some lovely wallpapers for you.
The front-facing camera array itself disconnects and lifts out without screws or glue. After wrestling with the screen, that’s a relief.
The USB-C port gets much less applause. Its long flex runs up the side of the phone to the logic board, with screws, adhesive, and other components obstructing the route. The port is a separate part, but getting it out is still a chore. Apple gave the iPhone 16 Pro a more accessible port arrangement. We miss it dearly.
Check it out in situ, thanks to our Lumafield Neptune CT scanner:
7 out of 10 Repairability, with Unfinished Business
Where does this all shake out, repairability-wise?
The battery tray and removable camera assemblies earn real credit. So does Apple’s repair support, though Repair Assistant still has to finish calibration for supported replacement parts. Our parts-availability and software pairing checks are still ongoing.
For now, both the iPhone 18 Pro and iPhone 18 Pro Max score a provisional 7/10 for repairability.
The scores take a hit for the fact that nearly all repairs go through the screen, which makes repairs more time-consuming and risks screen damage. But our damaged display frames haven’t directly tanked that score yet because we don’t know what caused the failures, how widespread they are, or how repeatable they are. They remain our biggest unanswered repair question.
If you open one of these phones, tell us how its display frame survives. A screwed-in battery is worth celebrating, but we’d like to get to it without sacrificing the screen around it.
And speaking of Frames, stay tuned… we’re keeping the teardown table hot.
Last but not least, here’s a full set of wallpapers.
