Modern Xiaomi, Redmi and POCO smartphones often feature massive camera blocks of three, four, or even five modules. To the average user accustomed to a single lens, this abundance of optics may seem like a marketing ploy or redundancy. However, behind each of these “eyes” lurks a specific optical circuit that solves certain tasks that cannot be performed using a universal matrix.
Having four cameras isn't just a way to increase the cost of a device, it's a way to create a complete ecosystem for mobile photography. Different focal lengths allow you to zoom in without loss of quality, capture wide panoramas of landscapes or take detailed close-up pictures of insects. Understanding the purpose of each module will help you stop using only the main camera and unlock the creative potential of your gadget.
In this article, we will take a closer look at the functionality of each lens, explain the technical features of their operation, and teach you how to choose the right module for different shooting scenarios. You will learn why digital zoom is inferior to optical and how a macro module helps capture the microworld.
Basic module: the base of your photo
The centerpiece of any camera system in Xiaomi smartphones is the core module, which is responsible for shooting in standard conditions in daylight and good artificial light. This lens usually has a focal length of about 24-27 mm (the equivalent of 35 mm), which corresponds to the angle of view of the human eye. The main camera has the most aperture optics and the best matrix in the entire system.
Most users use this module 90 percent of the time, without even switching to other lenses. Current HDR algorithms and Night Mode use the processing power of the processor specifically to process the signal from the main sensor, and the color and dynamic range are as high as possible for this model of device.
But the core module has limitations: it's not designed to zoom in or capture very wide panoramas. Trying to zoom with your finger on the screen activates digital crop, which inevitably leads to a loss of detail. For high-quality shots in the distance or near, you need to switch to specialized lenses.
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Always wipe the lens of the main module before shooting - greasy fingerprints create the effect of "soapy" pictures and glare from light sources, which is especially noticeable on a dark background.
It’s worth noting that in many low-end Redmi models, the main module may be the only quality lens. The rest of the cameras in the unit may perform support functions or be frankly weak. So when choosing a smartphone, it’s important to look not at the number of cameras, but at the characteristics of the main sensor.
Wide-angle lens: when you need more space
The second most important module in a four-camera system is the Ultra Wide, which typically has a focal length of 13-16 mm, allowing for much more space in the frame, and is indispensable for architecture, interiors, group photos and large-scale landscapes.
Using "width" allows you to place the whole building in the frame without departing from it for a hundred meters, or to shoot all friends in a narrow room without having to use panoramic mode. In Xiaomi smartphones, switching to this mode occurs instantly through the camera interface, often with automatic correction of distortions at the edges of the frame.
- 🏞️ Ideal for shooting landscapes, mountains and wide natural panoramas.
- 🏢 Allows you to shoot architecture and interiors in a limited space.
- 👥 Great for group photos when you need to fit a lot of people.
- 🎥 Adds speakers to video shooting, creating a movement effect.
It is important to consider that wide-angle lenses have a lower aperture than the main module. In low light, the quality of the images can drop markedly, noise appears and detail is lost. Also characteristic is geometric distortion at the edges of the frame, although MIUI software successfully combats this effect.
Telephoto and zoom: approach without loss
The fourth or third camera is often driven by the telephoto lens, which is designed to optically approach distant objects. Unlike digital zoom, which just cuts and stretches a picture, optical zoom uses a physical change in the focal length of the lenses, maintaining the full resolution of the matrix.
Xiaomi smartphones have telephoto lenses that are 2x, 3.3x, or even 5x, which means you can zoom in two, three, or five times without losing quality. For longer distances, a hybrid zoom is used that combines data from a telephoto lens and artificial intelligence algorithms to finish the detail.
| Type of zoom | Principle of work | Image quality |
|---|---|---|
| Optical | Physical movement of lenses | Maximum, no losses. |
| Hybrid | Optics and software combination | High, no noticeable loss |
| Digital. | Crop matrix and interpolation | Low, visible pixels. |
Using a telephoto lens also gives you access to the best portraits, and because of its long focal length, it naturally blurs the background and doesn't distort the proportions of the face, unlike a wide-angle camera, making it the perfect tool for artistic portraiture.
Why is a telephoto lens better for portraits?
Macro Camera: The World in Details
The fourth module in the system is often a specialized macro camera, whose only task is to focus on objects at a minimum distance from the lens (usually 2-4 cm), the main module cannot physically focus at this distance, since its minimum focusing distance is about 10 cm.
The macro module allows you to see the texture of the fabric, the structure of the leaf of the plant, the eyes of an insect or jewelry details. In Xiaomi smartphones, macro shooting mode is often activated automatically when you bring the phone close to the object, or is selected manually through the mode menu.
It’s worth noting that budget models can have low resolution (2MP), making it more of a marketing element, but Xiaomi’s Mi and Xiaomi 13/14 flagship lines feature full-fledged macro lenses with autofocus and high resolution, allowing for studio-quality shots.
- 🌸 Allows you to remove flowers and plants from a minimum distance.
- 🔍 Detalizes textures of materials, skin, paper.
- 💎 Ideal for shooting small objects: coins, jewelry, electronics.
- 🐞 Discovers the world of insects and small details of nature.
When using macro mode, it is critical to provide good lighting, because of the small distance to the object, the phone can block the light, creating shadow, using external lighting or shooting in bright daylight will greatly improve the result.
Depth sensors and monochrome modules
In some configurations, the fourth camera may not be a macro lens, but a depth sensor or a monochrome sensor, and the depth sensor does not take photos by itself, but instead scans space and maps distances to objects, which helps the core module blur the background more accurately in portrait mode.
Monochrome cameras, which lack Bayer's color filter, capture more light and detail, and pair with the main color module to provide brightness and contrast information, which allows for less noise and more detail, especially in low light conditions.
⚠️ Warning: If your phone specifies a "deep sensor" or a "blurder camera," don't expect it to be able to take individual pictures. It's an auxiliary sensor that works exclusively in conjunction with the main camera to improve bokeh.
The presence of these specialized sensors suggests that the manufacturer pays attention not only to the number of megapixels, but also to the quality of image processing. Xiaomi algorithms use data from these cameras to create a bokeh effect that was previously available only to professional SLR cameras.
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Specialized sensors (depth, monochrome) work in the background and do not have their own mode in the gallery, their task is to improve the pictures of the main camera.
How to Choose the Right Shooting Mode
Understanding the purpose of each of the four cameras allows you to consciously choose your mode of shooting. Don't rely on the automatic mode, which often selects the main module where the width or TV would be better suited. Experiment with switching the lenses through the zoom buttons (0.5, 1, 2, 5x).
For landscapes, always start with a wide-angle lens to gauge the scale. For portraits of people, use a telephoto lens (2x or 3x) to avoid facial distortion. For subject photography and textures, switch to macro mode. Keep the main camera for reporting and conditions where you need to quickly reach the phone and press the button.
☑️ Checking before an important shooting
Software capabilities are also important to consider. In Xiaomi’s camera settings, you can find features such as Long Shutter, Light Painting, or Documents, which often involve the specific operation of multiple cameras at once or use stabilization that is only available to certain modules.
⚠️ Attention: When shooting with zoom lenses (TV), hand stability is extremely important. Even minimal tremors when magnified strongly lead to a blurred frame. Try to keep your elbows pressed against the body or use a tripod.