For years, smartphone manufacturers have chased a holy grail of mobile photography: a variable aperture lens that can open and close like the iris of a traditional camera. Samsung has already taken its first steps in this direction, and Apple is widely rumored to be following suit. But a growing chorus of imaging experts and industry analysts are asking an uncomfortable question — does variable aperture actually matter on a sensor this small?
The concept is straightforward enough. On a full-frame or even APS-C camera, adjusting the aperture gives photographers meaningful control over depth of field and light intake. A wide f/1.4 aperture creates creamy background blur and excels in low light, while stopping down to f/8 or f/11 sharpens the entire frame and reduces optical aberrations. It is one of the most fundamental creative tools in photography. Naturally, phone makers want to bring that same capability to the devices that now capture the vast majority of the world’s photographs.
Samsung’s First Attempt: A Proof of Concept With Limited Returns
Samsung was the first major manufacturer to ship a variable aperture system in a smartphone, debuting the feature in the Galaxy S9 back in 2018. That phone offered two aperture settings — f/1.5 and f/2.4 — on its primary camera. The idea was that the wider aperture would help in dim conditions while the narrower setting would produce sharper results in bright light. As Android Authority detailed in a recent analysis, the feature was technically functional but produced differences that were, for most users, essentially invisible in final images.
Samsung quietly dropped the dual-aperture system after the Galaxy S10 generation, a tacit admission that the engineering complexity and added cost were not justified by the photographic results. The tiny sensor size of a smartphone — typically around 1/1.3 inches at best for a flagship primary camera — means that depth-of-field differences between, say, f/1.5 and f/2.4 are negligible. The physics simply do not scale the way they do on larger formats. Yet the allure of the spec sheet persists, and Samsung has reportedly been working on more advanced variable aperture systems for future Galaxy S Ultra models.
Apple’s Rumored Plans and the Telephoto Question
Apple, for its part, has been the subject of persistent rumors suggesting that a future iPhone — possibly the iPhone 17 Pro Max or a model arriving in 2026 — will incorporate a variable aperture mechanism. Analyst Ming-Chi Kuo and supply chain reports from multiple outlets have pointed to Apple’s work with lens module suppliers on mechanical aperture blades small enough to fit inside a smartphone camera stack. The expectation is that Apple would implement the feature on the primary wide camera, following Samsung’s earlier approach.
But as Android Authority’s Robert Triggs argued, both companies may be targeting the wrong lens. If variable aperture is going to make any perceptible difference to image quality and creative control, the telephoto camera is where it would matter most. Telephoto lenses on smartphones already produce more natural background separation due to their longer focal lengths. Adding aperture control to a telephoto module — where the optical effects of stopping down or opening up are more visually pronounced — could yield results that users actually notice, rather than differences that require pixel-peeping to detect.
The Physics Problem: Why Sensor Size Limits Aperture’s Impact
The fundamental issue is one of physics, not engineering. Depth of field is determined by three factors: aperture, focal length, and distance to the subject. On a smartphone’s wide camera, the actual focal length is extremely short — typically around 6.5mm to 7mm, despite being marketed as a “24mm equivalent.” At such short true focal lengths, even large changes in aperture produce only marginal shifts in the plane of focus. A portrait shot at f/1.5 on a phone’s wide camera and the same shot at f/2.8 will show almost identical background characteristics before any computational processing is applied.
This is why smartphones rely so heavily on computational photography for portrait-mode bokeh effects. The hardware alone cannot produce the kind of subject isolation that even a modest dedicated camera achieves optically. Variable aperture, in this context, becomes primarily a tool for managing light intake and potentially reducing certain lens aberrations at narrower settings — benefits that are real but far less dramatic than the marketing language tends to suggest. Modern smartphone ISPs (image signal processors) and multi-frame processing algorithms already handle exposure management with extraordinary sophistication, further diminishing the practical advantage of a mechanical aperture adjustment.
The Telephoto Argument: Where the Math Actually Works
The case for putting variable aperture on a telephoto module is more compelling on several fronts. Smartphone telephoto cameras now commonly feature focal lengths equivalent to 70mm, 100mm, or even 120mm. The Samsung Galaxy S25 Ultra uses a 5x periscope telephoto with a 120mm equivalent focal length. At these longer focal lengths, aperture changes produce more visible differences in depth of field. A shift from f/2.8 to f/4.5 on a 120mm-equivalent lens would create a noticeable change in how the background renders — not as dramatic as on a full-frame camera, but enough to give photographers genuine creative flexibility.
There is also a sharpness argument. Telephoto modules on smartphones are often the weakest optical link in the camera array, constrained by the physics of folded periscope designs and the need to keep the lens stack thin enough to fit inside a phone body. These lenses frequently suffer from softness and chromatic aberration at their widest apertures. A variable aperture that could stop down even modestly — from f/2.8 to f/4 or f/5.6 — would allow the optics to perform closer to their sweet spot, producing meaningfully sharper images in good lighting conditions. This is a well-understood principle in traditional photography: most lenses perform best when stopped down one or two stops from their maximum aperture.
Engineering Challenges and the Cost Equation
None of this is to suggest that building a variable aperture telephoto for a smartphone would be simple. Periscope telephoto modules are already among the most complex and expensive components in a flagship phone. Adding mechanical aperture blades to an already intricate folded optical path would introduce additional manufacturing complexity, potential reliability concerns, and cost. The aperture mechanism must be extraordinarily precise at this scale — the blades are measured in fractions of a millimeter — and must operate reliably over hundreds of thousands of cycles across the lifetime of the device.
Samsung’s experience with the Galaxy S9’s dual aperture also highlighted a user-experience challenge: most smartphone photographers do not manually adjust camera settings. The feature would need to be managed intelligently by the phone’s computational photography pipeline, automatically selecting the optimal aperture based on scene analysis, lighting conditions, and subject distance. This is achievable with modern AI-driven camera software, but it adds another layer of development complexity. The question for both Samsung and Apple is whether the resulting improvement in image quality justifies the investment when measured against alternative uses of those engineering resources — such as larger sensors, better lens coatings, or more advanced image processing algorithms.
What the Competition Is Doing Differently
Chinese manufacturers have been experimenting aggressively with camera hardware innovations that take different approaches to the same underlying goals. Xiaomi’s partnership with Leica and Vivo’s collaboration with Zeiss have focused on optical quality improvements through better glass elements and coatings rather than mechanical aperture systems. The Xiaomi 15 Ultra, for example, has drawn praise for its telephoto image quality achieved through a larger-than-average telephoto sensor and high-quality optics, without any variable aperture mechanism.
Sony, which supplies the majority of smartphone camera sensors worldwide, has been investing in stacked sensor architectures that improve dynamic range and low-light performance — addressing many of the same problems that variable aperture is supposed to solve, but through silicon rather than mechanics. The company’s latest IMX sensors feature dual-gain pixel architectures that effectively give the sensor two different sensitivity levels, providing some of the exposure flexibility that a variable aperture would offer, without any moving parts.
The Spec Sheet Trap and What Actually Matters
The smartphone industry has a long history of chasing specifications that sound impressive in marketing materials but deliver marginal real-world benefits. Megapixel counts ballooned from 12 to 50 to 108 to 200 over the past several years, yet the most meaningful improvements in smartphone photography have come from computational processing advances — night mode, HDR stacking, AI-driven scene optimization, and machine learning-based noise reduction. Variable aperture risks becoming the next entry in this pattern: a technically real feature that generates headlines and spec-sheet bullet points while contributing relatively little to the photographs that users actually capture.
If Samsung and Apple are serious about making variable aperture matter — about delivering a feature that produces differences visible to the human eye without zooming to 400% — they would do well to focus their efforts on the telephoto camera rather than the wide. The wide camera’s tiny true focal length makes aperture changes nearly imperceptible in practice. The telephoto, with its longer focal length and greater susceptibility to optical imperfections at wide apertures, is where the physics actually cooperate. Whether either company will take this approach remains to be seen, but the engineering and optical arguments point clearly in one direction. The next great smartphone camera innovation may not be about adding a feature to the most prominent lens — it may be about putting the right feature on the right lens.