How does mate50 turn on 50x digital zoom?

Choose to turn on the mobile phone camera and enter the camera interface to adjust the focal length. The focal length will be displayed on the right side of the interface. Press and hold here to adjust, and slide the focus option up to enlarge the camera magnification. The mobile phone supports 100 times the focal length, and then adjusts it to 50 times. After setting up, you can click on the photo.