How does iphonexs switch telephoto lenses?

Skills of using dual cameras of iPhone XS Max

20 18- 12- 10

Mobile phones have become the main shooting tool. IPhone XS and iPhone XS Max are equipped with two powerful cameras. How to set them to take more beautiful photos?

Take pictures with the focal length that mobile phones are good at.

The smaller the focal length, the larger the viewing angle of the lens. When the viewing angle reaches a certain level, you can shoot a wider space close to the subject, which is the so-called "wide-angle lens". The larger the focal length value, the smaller the lens angle of view, and when the focal length value reaches a certain level, you can pull a distant object to a very close position in the picture, which is the so-called "telephoto lens".

The focal length between them is commonly called "standard lens", and the viewing angle is close to that of human eyes. Most mobile phone lenses are located in this focal length, so we observe scenes close to or slightly larger than the human eye angle through the mobile phone lens, which also means that the images that mobile phones are good at shooting are also based on this angle.

The image that our human eyes can see is about 28 mm~35 mm focal length, so the mobile phone at this stage is still not suitable for shooting distant animals or the moon, nor for capturing the details of athletes' competitions in the stands. Similarly, it is not suitable for shooting wide scenes at close range. However, dual cameras have gradually become the mainstream configuration of mobile phones, and it is much easier to shoot telephoto lenses above 56 mm

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● "Single camera phone"-iPhone 6, iPhone 6s, iPhone 7, iPhone 8, iPhone XR and earlier models.

That is, a fixed-focus camera with a focal length of about 28 mm In the shooting interface, two fingers open the screen and feel that the picture is brought closer to the eyes. This is not to say that the focal length of the mobile phone lens has increased, but to directly enlarge the picture by means of "digital zoom". It is consistent with the principle of "magnification" function of the picture viewer in the computer, which has a great influence on the picture quality.

● "Dual camera devices"-iPhone 7 Plus, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max

That is to say, when we shoot with iPhone 7 Plus, the default lens is 28mm, and "1x" will be displayed at this time. When we switch to "2x", the lens will switch to a 56 mm lens. If you continue to zoom in, the model will be digitally zoomed based on the 56 mm lens, and the maximum zoom can reach 10x.

From "1x" to "2x", the digital zoom is still realized on the 28 mm lens, but it is only slightly stretched, and the picture loss will not be too serious.

The principle of using mobile phone photography is to use only the original focal length of the lens as far as possible, and only a slight electronic zoom can be used, otherwise the quality of the finished photo will be greatly affected, usually the zoom is not more than 3 times.