Xiaomi 18 Pro Max Underwater Photography Test: Our 2026 Score

Direct Answer: The Xiaomi 18 Pro Max receives an AquaExposure score of 3.5/5 for underwater photography. Its dual 200 MP sensor, co-developed with Leica, and its silicon-carbon battery of 8500 mAh are impressive on paper. However, the lack of a dedicated underwater housing confirmed to date, and the Chinese version without Google Play, require caution before any underwater purchase.

A dual 200-megapixel sensor signed by Leica, an 8500 mAh battery, a chipset etched in 2 nanometers. On paper, the Xiaomi 18 Pro Max, launched in China on September 23, 2026, has features that could attract the attention of underwater photographers.

But paper is not enough. This test aims to answer a specific question: is this impressive camera system actually usable for underwater use today, or does it remain, for the time being, a potential product on the catalog?

The answer lies in two caveats that must be considered before anything else: the version currently marketed is the mainland China model, without Google Play, and no dedicated housing has been confirmed for this specific model to date. This test therefore evaluates the manufacturer's specifications, not actual underwater use in real-world conditions.

This device is for: divers already in the Xiaomi ecosystem, willing to deal with the current lack of a dedicated housing while waiting for a manufacturer to become interested.

This device is not ideal for: an immediate purchase for diving. Without a confirmed housing and without an international version with Google Play, it's better to wait.

Score: 3.8/5

The Xiaomi 18 Pro Max features a 200-megapixel main sensor and a periscope telephoto lens, also at 200 megapixels, both developed with Leica, complemented by a 50-megapixel ultra-wide-angle lens.For More Details

• Main camera: 200 MP, f/1.7, 23 mm, Light Hunter 960L 1/1.28" sensor, OIS, dual pixel PDAF.
• Periscope telephoto lens: 200 MP, f/2.4, 75 mm, 1/1.56" sensor, OIS, 3.2x optical zoom, focus from 10 cm to infinity.
• Ultra-wide angle lens: 50 MP, f/2.4, 17 mm, 102 degrees, 1/2.88" sensor.

Maximum clean ISO is not officially documented for this specific model. Flare, burst RAW, buffer, and shutter lag are not officially documented to date. A conservative score of 3/5 is applied for flare and shutter lag, according to the rating method of the comparison tool.

The main sensor, with a 1/1.28" format like most 2026 flagship models, remains in the same physical category as its direct competitors. The real curiosity is the telephoto lens: a second 200-megapixel sensor with close-up focusing starting at just 10 centimeters, a distance that is interesting for subjects that do not tolerate close approaches, such as a shy fish, for example.

Score: 3.8/5

RAW files are natively available in DNG format via the camera's Pro mode, without relying on a third-party application, which is a real advantage. The Leica colorimetry, with a certified and documented partnership, produces a color signature recognized in the industry.The drawback affecting the score is that the currently available version is the mainland China model, which lacks Google Play Services (GMS). This makes MotionCam Pro, the leading professional RAW application for Android, unavailable. This is not a minor detail, it's a significant limitation for those who want to go beyond the native Pro mode.

For more details - RAW availability: native, DNG, via the camera's Pro mode. - Bit depth: not precisely confirmed for this model at the time of this publication. - Manual video white balance: Kelvin adjustment available in Pro mode, as with previous Xiaomi generations. - Maximum video codec: 8K at 30 fps HDR, 4K up to 120 fps in 10 bits (HDR10+, Dolby Vision, Log). - Color science: Leica certified and documented partnership. - Professional third-party app: MotionCam Pro (Google Play) is unavailable on the mainland China version without GMS. A deduction is applied to this criterion. Operating System and Ecosystem: Android 17 with HyperOS 4, but without Google Mobile Services on the mainland China unit currently on sale. An international version with Google Play is likely, similar to previous Xiaomi generations, but has not yet been officially announced as of the date of this publication.

Score: 3.8/5The base configuration offers 256 GB of storage, expandable up to 1 TB on the most advanced version, without an external memory slot. The USB-C 3.2 port allows for fast data transfer to an external SSD, a common practice between dives.

For more details - Connector: USB-C, USB 3.2 - Internal storage: UFS 4.1, 256 GB / 512 GB / 1 TB, no external slot - Specifications of the tested model: the base model has 12 GB of RAM and 256 GB of storage. The recommended model for intensive diving use would be the 512 GB or 1 TB version.

Score: 2.8/5

The device features an aluminum frame with Dragon Crystal Glass 3 on the front, cooled by a vapor chamber system, combined with a new OFFSET PoP chip enclosure to improve thermal transfer from the Snapdragon 8 Elite Extreme Gen 6 chipset.

This aluminum and vapor chamber design is structurally the same as the one that causes issues in cold water on other flagship devices on the market that use a similar cooling approach.[WARNING] Silica gel recommended. As with any smartphone with an aluminum frame and vapor chamber cooling, a packet of silica gel inside the housing is a serious precaution to take in cold water, below 15°C, even though no housing exists for this model at the time of this publication.

For more information - Frame material: aluminum frame, front Dragon Crystal Glass 3 - Internal cooling system: vapor chamber loop, OFFSET PoP chip enclosure - Certification: IP66, IP68, and IP69, immersion and resistance to high-pressure jets. No MIL-STD certification.

Score: 5.0/5

With 8500 mAh using silicon-carbon cells (approximately 32% silicon according to Xiaomi), the Xiaomi 18 Pro Max offers one of the largest batteries in currently marketed flagship smartphones. On paper, a full day of multiple dives should not pose any battery life issues.For more details:

• Capacity and chemistry: 8500 mAh, silicon-carbon (Si-C), 100W wired charging and 50W wireless charging.
• Lifespan: Not precisely documented for this model at the time of this publication. Silicon-carbon cells are generally advertised as having better longevity than traditional Li-Ion batteries, but no specific data is available for this device.
• Performance in cold water: Not documented.

Score: 3.0/5

The system combines laser autofocus, dual-pixel multi-directional PDAF on the main sensor, and PDAF on the telephoto lens up to infinity. On paper, this is a solid configuration.

The drawback once again comes from the ecosystem: without Google Play on the mainland China version, advanced third-party manual focus applications (such as focus peaking) remain inaccessible, which limits the fine-tuning of the autofocus compared to a device with the complete ecosystem.

Score: 0/5No manufacturer of underwater housings has announced compatibility specifically for the Xiaomi 18 Pro Max as of this publication. Divevolk mentions "Xiaomi" generically in the list of brands compatible with its SeaTouch 6 Pro (press release from September 16, 2026), without naming this specific model or confirming that its dual 200-megapixel camera system fits within the announced 17mm limit for that housing.

Until model-specific confirmation is released, a serious underwater purchase review on this point is not possible.

Available housing: None, as of today. Generic compatibility declared by Divevolk for the Xiaomi brand, without model-specific confirmation.

Ecosystem: Mainland China version only, without Google Play. MotionCam Pro is unavailable. An international version is likely but not yet announced.

Field workflow: The native RAW format in Pro mode is sufficient for occasional use, but the bit depth remains to be confirmed.

Observed prices: Starting from 6999 yuan in China (approximately 920 euros at the current exchange rate), up to 9999 yuan for the 16 GB / 1 TB version (approximately 1290 euros). European prices have not yet been set, and no official sales outside of China have been announced (as of September 28, 2026, sources: GSMArena, igeekphone, mobiarea).Availability: Not applicable, the device is brand new.

On paper, the Xiaomi 18 Pro Max boasts one of the most ambitious camera systems on the market this season. However, two significant limitations currently prevent us from recommending it for underwater use: there is no confirmed underwater housing available for this specific model, and the mainland China version lacks Google Play, which restricts the ecosystem of RAW processing and manual focus applications. For a scuba diving photographer considering this device, the best approach is to wait for confirmation of housing compatibility and, ideally, a global version with Google Play before making a purchase dedicated to underwater photography.

Composition and framing techniques are always more important than the equipment itself. This is what we teach in our AquaExposure underwater photography course.

To compare this model with smartphones that already have underwater housings, visit our underwater photography equipment comparison tool. To stay up-to-date on housing compatibility as new models are announced, our smartphone underwater housing comparison tool is the resource to consult.