Xiaomi 17 Ultra camera explained: LOFIC sensor, continuous zoom, and Xiaomi’s push beyond AI photography
Smartphone photography has spent the last few years chasing better results through software, be it through stacking exposures, HDR processing, increasingly aggressive AI enhancement, or all of the above. With the latest Xiaomi 17 Ultra, however, Xiaomi says it is trying to push the conversation back toward hardware.
In a conversation with 91mobiles, both Anuj Sharma, Chief Marketing Officer at Xiaomi India, and Sandeep Singh Arora, Chief Business Officer at Xiaomi India, explained the thinking behind two of the flagship’s most notable camera features: a new LOFIC-enabled sensor and a continuous zoom telephoto system. Both, they say, are part of Xiaomi and Leica’s evolving partnership, which has now moved from “co-engineering” to “co-creation.”
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From Leica co-engineering to co-creation
When Xiaomi first partnered with Leica in 2022, the goal was to move beyond simple branding collaborations common in the smartphone industry.
According to Sharma, the companies instead set out to solve imaging problems together.
“Everyone else used to do brand licensing or camera tuning,” Sharma explained. “We said it’s going to be a co-engineering partnership, where we solve hardware and software problems together.”
Over the past year, that partnership has expanded further. Xiaomi and Leica have set up joint imaging labs in China and Germany, focusing on what Sharma describes as the miniaturisation of professional photography.
With the Xiaomi 17 Ultra, the collaboration now enters what the company calls a co-creation phase — where both companies work toward rethinking how smartphone cameras should capture images, rather than just improving existing techniques.
The Xiaomi 17 Ultra’s LOFIC sensor: improving how phones capture light
The first major change comes in the form of LOFIC (Lateral Overflow Integration Capacitor) technology integrated into the phone’s 1-inch main camera sensor.
While the sensor size itself isn’t new, LOFIC changes how the sensor handles light and dynamic range. In simple terms, the goal is to make the sensor behave closer to how the human eye perceives scenes.
“Leica’s idea was how close a camera can get to how the human eye sees a subject,” Sharma said.
One of the biggest benefits of LOFIC is a dramatic improvement in signal-to-noise ratio, which directly impacts dynamic range and low-light performance.
According to Xiaomi’s internal figures shared during the discussion:
- Previous smartphone sensors achieved around 83dB signal-to-noise ratio
- The new LOFIC-enabled sensor reaches 109dB
- For reference, the human eye is roughly around 100dB
The practical benefit is that the sensor can capture extremely bright and extremely dark elements in a single exposure.
“Leica’s idea was how close a camera can get to how the human eye sees a subject.” Traditionally, smartphones rely on HDR techniques that combine multiple frames to achieve this effect. LOFIC allows the Xiaomi 17 Ultra to capture more information in a single shot, reducing reliance on heavy processing.
“Most phones use HDR with three, five or even seven exposures,” Sharma explained. “With this sensor, it’s physics doing the work instead of software.”
This also improves night photography in scenarios where phones typically struggle — for example when a scene contains both very bright light sources and deep shadows, such as a bonfire or street lighting.
To get an idea of what the Xiaomi 17 Ultra is capable of, below are some camera samples taken from the China unit that I checked out briefly:
Continuous zoom replaces multiple portrait cameras
The second major camera innovation on the Xiaomi 17 Ultra is a continuous zoom telephoto system. Traditionally, smartphone cameras address focal-length limitations by adding multiple lenses, for example, a 3x portrait camera and a separate 5x periscope. Xiaomi has instead introduced a system that allows its 200MP telephoto sensor to move continuously between approximately 75mm and 100mm equivalent focal lengths. This translates to roughly 3.2x to 4.3x optical zoom, covering the most popular portrait photography focal lengths.
The reason for this change comes from a long-standing debate among photographers: which focal length works best for portraits? Some prefer 75mm, others 85mm, and some favour 100mm.
“Until now, the answer would have been to add more cameras,” Sharma said. “But that’s always a compromise because you can’t keep increasing the number of sensors.”
By using continuous zoom instead, Xiaomi says it can cover the entire portrait range without switching lenses, avoiding colour shifts or abrupt changes in perspective. It also allows the phone to maintain a simpler camera layout with three cameras instead of four or five.
The telephoto sensor can also extend far beyond that range digitally. Sharma claimed the system is capable of producing usable images even at extreme focal lengths approaching 900mm.
A push against AI-heavy photography
Perhaps the most interesting takeaway from Xiaomi’s approach is its stance on computational imaging. While AI remains part of the imaging pipeline, Xiaomi says it deliberately limits its role.
On the Xiaomi 17 Ultra, AI processing reportedly kicks in only after 20x zoom, with the company preferring to rely on hardware improvements for the core imaging experience.
“AI is great for memes,” Sharma joked during the conversation. “But an AI image won’t create a core memory for you.”
Instead, Xiaomi’s strategy with the 17 Ultra is to focus on capturing as much real data as possible through the sensor and optics, allowing the photo to reflect the scene more faithfully.
“An AI image won’t create a core memory for you.” The bigger picture for Xiaomi’s imaging strategy
Taken together, the LOFIC sensor and continuous zoom system suggest Xiaomi is trying to tackle two long-standing smartphone camera challenges:
- Dynamic range and realistic image capture
- Flexible portrait focal lengths without adding more cameras
More importantly, they signal a shift in philosophy.
Rather than leaning further into AI-driven processing — a direction many smartphone brands are currently exploring — Xiaomi appears to be investing more heavily in hardware-driven photography, backed by its deeper collaboration with Leica.
“If you want to set the benchmark in advanced imaging technology on a phone, it has to be hardware and software,” Sandeep said. “I mean, you can keep doing the processing, which is what other brands will keep doing, but that will take you only so far. It will eventually depend on what’s going into the lens.”
“If you want to set the benchmark in advanced imaging technology on a phone, it has to be hardware and software.” If the Xiaomi 17 Ultra’s camera performance lives up to the company’s claims, it could mark one of the more meaningful shifts in smartphone imaging this year. I’ve had a glimpse of what the Xiaomi 17 Ultra’s cameras can do from a brief use of the China unit, but I’m keen to test the Indian unit extensively to understand exactly what can be achieved with the new LOFIC technology and continuous zoom, among other things. The Xiaomi 17 Ultra, along with the Xiaomi 17, launches in India on March 11th.
