Are Modular Camera Lens Phones the Future? A Hands-On Review of Xiaomi and Realme's Latest Innovations

The mobile phone industry has witnessed several attempts to integrate modularity with smartphones. From Moto Mods to LG’s G5, the dream of adding new functionalities to your phone through accessories has been around for a while. However, a recent concept unveiled at Mobile World Congress 2025 by Xiaomi is taking modularity to a new level. Xiaomi’s Modular Optical System (MOS) introduces a magnetic camera lens that attaches to a custom Xiaomi 15 smartphone, making this an exciting step toward a more flexible mobile photography experience. But how legitimate are these modular camera lens phones? We’ll dive into two models that stole the show at MWC 2025, the Xiaomi 15 with MOS and Realme’s Ultra series, and assess their real-world potential.

Xiaomi’s Modular Optical System: Revolutionizing Mobile Photography

At Mobile World Congress 2025, Xiaomi stunned the audience with its Modular Optical System (MOS), a magnetic camera lens system that attaches to its custom Xiaomi 15 smartphone. Unlike previous modular efforts, this one integrates seamlessly, offering a true optical upgrade with a fully working camera lens.

The prototype uses a magnetic mounting system similar to Qi2, with two small pins that connect the lens to the phone. These pins allow the lens to draw power from the phone’s battery while transferring data to the device, enabling real-time connection with the camera interface. This connection makes the system more than just an add-on lens — it integrates fully with the phone’s hardware and software.

The MOS lens includes a 100MP Light Fusion X Micro Four Thirds sensor, which is significantly larger than most flagship phone sensors. Coupled with a custom 35mm lens and variable aperture (up to f/11), the Xiaomi 15 offers a manual focusing ring with satisfying haptic feedback, providing a hands-on, high-quality camera experience. When you attach the lens, the camera app displays a toggle for switching to the lens’s live view, which is essentially a 2x crop of the phone’s original view.

The result? A professional-level camera lens with an easy-to-use interface, all integrated within your smartphone. No more struggling with external lenses that are hard to connect and manage.

Realme Ultra: A Modular Lens with More Freedom, But Less Convenience

While Xiaomi’s approach seems to be the most polished, Realme also showcased its own modular camera lens concept at MWC 2025. The Realme Ultra, unlike Xiaomi’s solution, does not use a magnetic mounting system. Instead, it relies on mounting external M-mount lenses over the phone’s existing camera module. While the lens can fit any M-mount lens, the setup is far from as seamless as Xiaomi’s MOS.

Using the Realme Ultra with attached lenses feels more cumbersome and less intuitive. It’s more unwieldy than Xiaomi’s design, making it less user-friendly for those who want quick and easy access to professional-level photography. Nevertheless, it allows for a broader selection of lenses, offering flexibility for those willing to deal with the added bulk.

Modular Fun: A Return to the Past?

Modularity in smartphones was once the promise of the future. However, after the flop of Moto Mods and the awkwardness of the LG G5’s modular design, the dream seemed to fade. Xiaomi’s take on modularity is refreshingly different. With magnetic mounts and optical pins transferring data in real time, Xiaomi’s system feels more intuitive and functional than its predecessors.

Xiaomi’s technology seems like a return to the simplicity that mobile photographers have been waiting for. The addition of a camera lens to a smartphone without clunky add-ons or frustrating software bugs marks a new era for modular accessories.

What Undercode Says:

The potential of Xiaomi’s Modular Optical System (MOS) is immense. If the company succeeds in commercializing this technology, we could witness a new era for smartphone photography. The integration of a larger sensor, manual focus, and optical zoom is a clear win for mobile photographers who have long desired a more robust solution than what current flagship phones offer.

However, the success of this technology depends on several factors. First, the execution needs to be flawless. The MOS lens has to deliver on its promises of portability, ease of use, and image quality. While Xiaomi’s system looks promising, real-world tests will be crucial. Second, the market’s willingness to embrace modularity remains a question. Consumers may be hesitant to invest in a phone that requires extra accessories to perform optimally. The portability of these accessories, as well as their price point, will play a key role in determining whether this technology takes off.

Realme’s solution, while interesting, seems to lack the polish and convenience that Xiaomi’s system provides. The use of M-mount lenses offers greater flexibility but sacrifices ease of use, which could make it less appealing to casual users.

In the grand scheme of things, modular cameras could be the next logical step for smartphone evolution. As phones continue to become more powerful, allowing users to upgrade specific components (like the camera lens) could lead to greater customization and longevity. The key will be finding a balance between flexibility, ease of use, and affordability. If Xiaomi and others can nail this formula, modular phone accessories might finally have the staying power they’ve lacked in the past.

Fact Checker Results:

Xiaomi’s MOS Lens System: The Xiaomi MOS offers a significant step forward in modular camera technology, promising more robust mobile photography without the flaws of previous modular systems.
Realme’s Ultra Lens Mounting System: Although innovative, Realme’s use of external M-mount lenses introduces complexity, which may limit its appeal to the average consumer.
Modularity in Smartphones: While modularity is a promising concept, it’s unclear whether the market is ready for accessories that add to the cost and bulk of mobile devices. The success of Xiaomi’s approach will depend heavily on consumer adoption and ease of use.

References:

Reported By: https://www.zdnet.com/article/are-modular-camera-lens-phones-legit-i-tested-two-models-that-everyones-talking-about/
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