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The Apple iPhone 18 Pro and 18 Pro Max have arrived, and their familiar outward appearance belies a major change to the main camera. For the first time, an iPhone features a variable aperture, and PetaPixel spoke with Apple to learn firsthand why it was created, how it works, and what it means for how people capture photos and videos on Apple\u2019s latest flagship phone. <\/p>\n
This was a rare chance to have a candid, unscripted conversation with Apple and gain valuable insight into how the company approaches the engineering and design decisions of one of its most important and valuable product lines, the iPhone Pro. <\/p>\n
Why Is Now the Right Time for a Variable Aperture on iPhone? <\/p>\n
Perhaps the most pressing question about the iPhone 18 Pro series\u2019 new variable-aperture main camera is, \u201cWhy now?\u201d Apple has had plenty of opportunities to introduce a variable aperture before, and many of its competitors have done just that. <\/p>\n
\u201cEspecially on our Pro line, we really want to make it as simple as possible for anyone to get the best shot possible, all while giving really technically advanced capabilities for pros, people who may be experienced in photography and videography,\u201d says Jeremy Hendricks of Apple\u2019s iPhone Product Marketing team. <\/p>\n
Especially on our Pro line, we really want to make it as simple as possible for anyone to get the best shot possible\u2026<\/p>\n
\u201cOur Pro line over the years has really had to evolve and balance both of those sides,\u201d Hendricks continues. <\/p>\n
As it happens, it was less about why introduce the variable aperture now, and much more about how to improve image quality. The new variable aperture was, at least at first, a means to an end. <\/p>\n
\u201cSo we really started from sensitivity, actually. We\u2019re always trying to make our cameras better, bring better image quality to customers,\u201d Matt Waldon, Senior Director of Camera & Depth Hardware at Apple, tells PetaPixel. \u201cAnd in this case, we really wanted to improve the sensitivity. And there\u2019s a few ways to do that.\u201d <\/p>\n
As Waldon explains, you can increase the image sensor size; that\u2019s a surefire way to improve sensitivity, all else equal. However, this has drawbacks. Bigger sensors require more physical space, bigger lenses, and more processing power, for starters. <\/p>\n For Apple, the better solution was to make a faster aperture. In the iPhone 18 Pro and Pro Max\u2019s case, that meant going from an f\/1.8 aperture to an f\/1.48 one. <\/p>\n \u201cSo this camera now has an f\/1.48 lens,\u201d Waldon says. \u201cAnd if we did that without variable aperture, in some shots, for example, if you\u2019re shooting somebody close and you have something in the background you want to capture\u2026 you would really lose sharpness and not necessarily be able to take the shot you want to take.\u201d <\/p>\n Variable aperture then became a necessary engineering challenge to overcome because Apple wanted to increase the speed of the iPhone\u2019s lens without worsening image quality when a faster aperture isn\u2019t needed. <\/p>\n As Hendricks says, though, variable aperture offers many benefits to the end user beyond better photo and video quality. It also gives serious photographers and videographers more creative control over how their content looks, and that\u2019s right up Apple\u2019s alley.<\/p>\n \u201cSo when you look at something like aperture, that seemed like the next natural thing to bring to the Pro camera system, [to] be able to expand that overall creative range for everyone,\u201d Hendricks explains. <\/p>\n So when you look at something like aperture, that seemed like the next natural thing to bring to the Pro camera system\u2026<\/p>\n Waldon remarks that Apple got really excited about the creative possibilities the variable aperture system offers. <\/p>\n \u201cBeing able to shorten the depth of field even beyond what you can shoot with today at f\/1.8. Being able to close down the aperture gives you more things you can do when it comes to video. You can have more flexibility in shutter speed. Even in stills, you can have more flexibility in shutter speed. When you want it, you can get this very cool starburst effect,\u201d Waldon says. <\/p>\n Six Aperture Blades Struck the Right Balance <\/p>\n Speaking of that starburst effect, the stepless variable aperture mechanism incorporates six precisely designed, equally rigorously engineered blades. Why six? <\/p>\n \u201cSo six blades was really a combination of things. One is just the physical dimensions of it. The more blades you add, given the size constraints, it becomes difficult to fit them all in, frankly. So there\u2019s, there\u2019s a physical constraint,\u201d Waldon tells PetaPixel. <\/p>\n \u201cObviously we want enough blades to give sort of a nice, smooth aperture at every setting. So we did a lot of optimization around the shape of the blades and at every aperture setting,\u201d he continues. \u201cYou sort of see how the blades have a big impact on how bokeh and out of focus areas look. It impacts how the starburst looks. So for this particular design, six was really the sweet spot.\u201d <\/p>\n Each of the six laser-cut aperture blades is constructed from a specialized polymer composite Apple designed to strike the right balance between mass, flexibility, and durability. Each blade is thinner than a human hair and works alongside a new compact rotor mechanism. <\/p>\n \u201cSo it\u2019s amazing that you have this incredibly complex camera module, let alone with the rotor mechanism, with all of these different things that enable variable aperture in a really smart way on something that you have just in your pocket all the time with you,\u201d Hendricks says. <\/p>\n Of course, in typical Apple fashion, each aspect of the new variable aperture is described with hype-generating language. Still, there\u2019s no question that no detail is too small when it comes to the iPhone 18 Pro\u2019s key new camera feature. Every millimeter of space inside the phone is precious, and conflicting goals often come into play. Fitting a stepless variable aperture system into a relatively small smartphone camera module is no easy feat, as evidenced by the fact that many companies that have done it before ultimately stopped doing it in subsequent models. <\/p>\n Each Aperture Value Has Its Place <\/p>\n As for the stepless design, the users themselves, at least for now, only have access to four aperture settings. Mobile photographers and videographers can switch between f\/1.48, f\/1.8, f\/2.8, and f\/4, though the default is f\/1.8. <\/p>\n Apple says f\/1.8 remains the best overall choice because it is very sharp, still delivers some background blur when the subject is close to the camera (as it often is), and is familiar to users. It strikes a good balance between sharpness and speed. <\/p>\n \u201cSo there is a little bit of trade off as you go to to higher or lower apertures, where you sacrifice a little bit of sharpness [at f\/1.48 because of aberrations] and on the long end, [f\/4], because of diffraction,\u201d Waldon explains. <\/p>\n Even if f\/1.8, or at least near it, is the optimal aperture in many situations, Apple is committed to giving users more choice. Hendricks and Waldon are especially interested in how videographers use the variable aperture to dial in the perfect shutter speed for the look they want. <\/p>\n![\"A](\"https:\/\/petapixel.com\/assets\/uploads\/2026\/09\/IMG_0004-converted-DNG.jpg\")
<\/a>iPhone 18 Pro main camera, f\/1.48, Apple Pro RAW | Photo by Jaron Schneider <\/p>\n<\/p>\n<\/a>f\/1.48 is not always the best option. Giving Photographers More Creative Control <\/p>\nCredit: Apple <\/p>\n<\/a>f\/1.8 offers a nice starburst | Photo by Jaron Schneider <\/p>\n<\/a>iPhone 18 Pro Main camera, f\/1.48, Apple Pro RAW | Photo by Jaron Schneider <\/p>\n