The dual-camera systems on the smartphones are not new now, they have been around for several years, and they were a 3D video or 3D image on HTC EVO 3D, and then another model was presented with One M8 , And then moved the experience to the LG G5 but through a wide-angle lens "At the same time Apple also decided to follow the same way through the phone of the iPhone 7 Plus and the addition of a lens" telephoto "and Huawei has moved forward Through its partnership with Leica lenses, where the P9 launched a monochrome lens.
But the most important question is, how many cameras are there? What are the differences between them? And more importantly, is it as good as it is talked about? Or is it just a fleeting fad? Let's find out.
Depth sensor
We will start with this because this is the basic form of dual camera system, in this system, the main camera accompanied by a second camera its only function is to transfer 3D to the scene map in front of the camera.
And as you know we are able to see the three-dimensional scene that we have a couple of eyes, with a slightly different vision help us to move depth, especially for things that are close to us.
The second camera in this system works in a similar way with the secondary camera, where the system news is separated by the distance between the object and the lens, and the system works to manipulate the image using the information, to separate the object or the object to be photographed and isolated from the background.
The most common use of this technique is to create depth and come naturally through DSLR cameras that own large sensors and large lenses, so smart phone cameras do not have this depth through small sensors, so a couple of lenses are used to work with technology Which was explained at the beginning of the article.
The camera with luminous lenses does not always have a blurry picture in the background as needed, unlike the DSLR camera. This is because all smartphones have the ability to completely blur the background, unlike a professional camera that has the capability Controls the blur estimate on the focus that is fixed on the element.
Camera systems with a dedicated rear sensor are one of the rarest types of dual camera systems, and we have seen the first of these tests with the HTC One m8 then.
But now it's essential for most cameras in major companies, with Huawei using the Honor 6X and Lenovo with the Lenovo K8 Plus.
Monochrome camera
The most common and used species, which rely on secondary sensors in this method, the main camera is accompanied by a secondary camera often identical and usually match the sensors, lens openings and focus systems.
The main difference between these two cameras is that the sensing device for one of them has the ability to capture a picture by jumping on the basic RGB colors, while the other is to introduce more light with the basic colors.
Therefore, each time the images are taken, the system will combine both images captured through the camera and take out a picture with the largest amount of color and light, of course, in theory.
You can also use only one monochrome camera to show a better picture but at the expense of other colors.
There are no disadvantages to this system, and the system has been discussed at the level of several experts, where everyone saw the trend towards improving the quality of the image rather than the additions of features, where it is preferred to take pictures with the enlargement while preserving the image quality.
The camera has a wide angle
This type of camera was first spotted on the LG G5 camera, carrying a camera with a wide or wide nook, for example to understand the idea more will touch the phone G5
The device had a 16 megapixel camera with a 16mm lens, a 1.8-inch rear camera and a 8-megapixel camera with a 12-mm lens with a 2.4-inch lens. Here, the camera's focal length was provided from the secondary camera, allowing it to capture Photos with a far wider range than the need to move back to expand the scene.
This type of camera was first spotted on the LG G5 camera, carrying a camera with a wide or wide nook, for example to understand the idea more will touch the phone G5
The device had a 16 megapixel camera with a 16mm lens, a 1.8-inch rear camera and a 8-megapixel camera with a 12-mm lens with a 2.4-inch lens. Here, the camera's focal length was provided from the secondary camera, allowing it to capture Photos with a far wider range than the need to move back to expand the scene.
It is not only the G5 phone that has this kind of lens, we just recently saw a device with a wide angle lens with the Motorola X4.
So this type of camera actually gives real value especially with users who want to shoot a scene that contains a group of people where this lens can capture the scene better
And although it was showing good pictures, but there are those who pointed to the disadvantages of these lenses, where the image seemed to have been taken by the camera "GoPro" GoPro.
Maybe it's negative for some and maybe positive, but LG followed the same lens with the V20 and V30 phones with several improvements as the images looked more aesthetic.
Many experts considered this system to be optimal and recommended that it be used by all companies.
Telephoto Camera
There is also a very popular and widespread system, a system with a close-coupled camera. In this system, the basic camera is paired with the secondary camera that has a telephoto lens.
This is the exact opposite of the wide-angle camera system, where the user can focus in zoom on a particular element rather than with a full zoom scene.
Since the launch of this order with the phone of the iPhone 7 Plus and the company adheres to this type, where the phone has what imams X2 of optical convergence.
The system has many advantages. The first is to get a picture closer to the X2 is more pronounced and this is the first thing on smart phones, but will not get the same quality in case there is a fast movement.
The image taken with a telephoto lens also has additional features. The image is more aesthetically pleasing than the wide lens, and the images maintain their quality despite the rounding.
It can also be used to blur the background and make it blurry, as the combination of the telephoto lens and the telephoto lens showed a superior image.
But of course this system is also flawed. The iPhone 7 Plus had a 2.8-inch mini-camera compared to the main 1.8 without the OIS for the secondary camera, while the iPhone 8 Plus had the same sensor, taking into account the improvements to the camera , As well as the phone "iPhone X" came with aperture lens 2.4 for the secondary camera, although it owns OIS.
While the Samsung Galaxy Note 8 is the first handset to carry the OIS but aperture lens 2.4 compared to the 1.7 lens slot for the main camera with a sensor is not very good but the same accuracy.

As a result, there is a difference in the quality of the image when captured by the close-up lens, which is worse in low light conditions because of the small lens it owns, so most companies opted to disable the close lens option, and was replaced by digital zoom.
So it seems to us that there are still a lot of limitations, to get a phone lens with a strong specification, such as those borne by professional cameras, because it is also related to several things and ramifications that may be difficult for the reader to understand correctly, so I decided in this article to clarify the differences between those cameras and hit For example on some devices.
In the comments box share your opinion and experience with the smart phone camera
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