How to turn on the dual camera of iphone7plus?

Unlike Huawei P9, the iPhone7 camera has two cameras working at the same time. He is a lens, a zoom camera, and an ordinary lens. One of the selling points of Apple 7plus is the super-professional dual-camera hardware, which is very easy to use for people who like to take pictures. But you can't switch cameras artificially, that is, you can't use whichever you want.

In portrait mode, the auxiliary camera in the middle will be turned on, and the main camera outside will be used in other modes. Iphone7plus uses dual cameras, one is a wide-angle lens (F 1.8)+ a telephoto lens (F2.8), and both lenses are120,000 pixels, and the focal length can be adjusted by 10 times. If it is more than 2 times, it becomes digital zoom. Photographers only need to compose pictures without focusing, which is more conducive to capturing pictures. It will make the portrait stand out. When zooming to twice the focal length, iphone7plus will enable 56mm lens for optical zoom, while iphone6plus can only rely on digital zoom.

The back is equipped with two12 megapixel cameras, a wide-angle lens and a telephoto lens. The former uses F/ 1.8 aperture, and the latter uses F/2.8 aperture. The Iphone7 plus has been equipped with four flash lamps instead of two. It will be adjusted according to the ambient color temperature, and the dual camera of iphone7 plus also has anti-shake function. When we use Apple's dual cameras in dark light, Apple will stop using the telephoto lens, and there is no optical zoom function, only the digital zoom that can be extended to 10X. The image of iphone7plus at twice the focal length is a clear image that we have never seen on a smartphone before.