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Dual Cameras. How do they work? What is the difference between them? (VIDEO)

Dual Cameras. How do they work? What is the difference between them? (VIDEO)

In today's video, I wanted to comment on something pending: how the dual cameras vary between manufacturers. In the high range it is already quite common to see the implementation of two lenses in the back, which gives us a variety of options. Almost all manufacturers have already made the leap to using a pair of cameras in the rear and today wanted to cover the most popular and common.

2 Different Focal Ranges (iPhone 8 Plus, iPhone X, Galaxy Note 8)

The first of them is the implementation made by Apple. Through this system, we have two lenses with different focal ranges. Just as with a camera we can change lenses and get another perspective, the iPhone and the Galaxy Note 8 use two cameras that offer two different perspectives.

To better understand this, take a look at this image from the Photographer's Blog:

In very simple terms: having a focal length of 8mm gives us a fisheye perspective. The more focal length, the more zoom we will have in the image

We have the main camera that offers us the same angle as most cameras. In the case of the iPhone and Note 8, it is a wide, or angular, lens with an equivalent of 24mm. In photography, this type of lens is extremely practical, as it is perfect for capturing landscapes, taking street photography, capturing people, and more.

The secondary lens in this configuration offers a focal length of 56mm. In a traditional camera, a 50 or 56mm lens is used for portraits. Because of this, we usually have to get further away from the subject or person in order to take a photo.

Taken into practice, the secondary lens gives us a 2X optical zoom; that is, we can have a magnification of the image, without losing quality as it happens with the digital zoom.

This real zoom is perfect for concerts, conferences, landscapes where we need to capture more detail. If you are constantly zooming in on your images digitally, but regret the loss of quality, an iPhone 8 Plus or Galaxy Note 8 is perfect for what you are looking for.

In addition, having a telephoto lens and a wide one so close allow the phone to detect depth, allowing us to generate a blurred background in the images., giving it a more professional touch

Ultra Wide / Wide Angle (LG G6, LG V30)

LG offers just the opposite: instead of having a Zoom, a greater focal length, LG offers us a wide angle lens, with a shorter focal length. What is achieved with this, is to obtain photos that can cover much more content and is ideal for landscapes.

This Ryan Whitwam photo for Greenbot gives us an excellent example of the different perspectives we get from both lenses. And yes, both photos were captured from the same place, at the same distance

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This is perfect for those who always find themselves wanting an action camera that they can take anywhere; people who tend to travel a lot and are in constant contact with nature. An ultra wide angle like that offered by the LG G6 and V30 is super practical for this type of photography.

The only problem is that the lens of the LG G6 is not the best, so in night photos it leaves something to be desired. When the weather is nice, and sunshine, or strong artificial light, the LG G6 is one of the most fun cameras we can use.

The LG G6 does not offer a portrait mode, so it does not allow us to blur the background.

RGB / Monochrome Sensor (Huawei Mate 10 Pro, Mate 9, P10, P10 Plus, P9)

Huawei was one of the first manufacturers to implement the dual camera system, and it was done by Leica. Unlike the method used by the iPhone or the LG phone, in the Mate 10 Pro we find two lenses with the same focal length. The difference? That one of the two sensors is monochrome.

Having a monochrome sensor allows the Mate 10 to capture much more detail than a regular sensor, because instead of having to scatter the captured light through filters (for green, red and blue), a monochrome sensor is simply responsible for capturing all available light. The Mate 10 Pro then uses the RGB (color) sensor to paint over the captured image with the monochrome sensor. This gives us, as a result, images with much more detail, since it has a sensor dedicated to capture only light. In essence: A color sensor only captures 1/3 of the light that a monochrome sensor can capture, which helps the Mate 10 Pro a lot to get spectacular photos even in low light. You can read more about the benefits of a monochrome sensor over a color one, in this Red publication, the makers of the popular video cameras used in film.

Another advantage of having two lenses with the same focal length is that the portrait mode of the Mate 10 Pro is among the best. The Mate 10 Pro's cameras work like our eyes, capturing objects in a three-dimensional way due to the angle variation between the two. Thanks to this, it has one of the best portrait mode implementations on the market.

Each of the systems offers something special, something useful. Perhaps in the future we will see a camera that offers more than two lenses and can give us three different perspectives, which combines all the functions of each of the dual cameras. If I had to choose one, though, I'm going for the Mate 10 Pro implementation for photography. On video? Both the iPhone / Note and the LG G6 are superior; but it already depends on the taste of each one.