What’s the point of dual cameras on smartphones

The big news of the last few months in the world of smartphones is the dual rear camera that provides higher quality shots

We all will have seen them, some of us will also have a smartphone with this technology. We are talking about the dual rear camera on phones. By now it is no longer new, but still not everyone is clear what they are for. Let's see then what is the purpose of having a dual camera.

Of the two cameras one is the primary one, that is the fundamental one for the quality and beauty of the shots, the other is the secondary one that helps the first in some situations and allows you to use additional functions. The use of the secondary camera aims to produce images that have a greater depth of field, more pronounced clarity and overall faster focusing ability. The functions of the secondary camera depend on the model of the smartphone. On the LG G6 we find a wide-angle lens, on the iPhone 7 Plus a telephoto lens, while in other cases a simple black and white lens.

The use of dual cameras

At this point the question is legitimate: what is the point of having a camera for black and white? The intent of a black and white lens is to capture, quite intuitively, black and white only scenes. It helps to adjust the amount of light reaching the point of focus, thus achieving a sharp image with lots of detail brought out. In other cases, the dual camera is used to emphasize one object or character over another. A function that can also be used after the shot has been taken.

Huawei P10

Let's look in detail at some of the most popular dual cameras on the market. Let's start with the one on the Huawei P10. It's a monochrome camera that helps take the best of both shots to present the user with the most perfect final photo possible. This feature is especially useful in suboptimal lighting conditions, but also in cases of excessive brightness.

iPhone 7 Plus

Apple has done a different job, the two cameras perform different tasks from each other and also differ in features. The main sensor is a 28mm wide-angle lens while the secondary one is a 56mm telephoto lens. This second camera is perfect for making the so-called portrait photos, which are shots capable of highlighting a character or an object in relation to the scene, giving a natural touch to the depth of field and details, even the smallest.


On the LG G6 instead, the dual camera uses a wide-angle effect that is useful for making photos in style "panoramic" but without losing naturalness or change the real size of objects and landscapes. This is the largest field of view currently available to a smartphone camera.


Basically, after this quick roundup, the questions are two: is the dual camera better than the single, and which one is better to buy? The truth is that photo quality depends exclusively, or almost exclusively, on the main camera. So a good rear camera cannot be outdone by a decent dual camera. The advantage of the dual camera is that you can take shots with very special effects.