How does Apple 6 use the slow photography function?

Turn on the camera, and then the default is the following photo, with video on the left and slow motion on the left. Just dial it to the slow motion position!

IPhone6 photo countdown:

Turn on the camera of iPhone6, click the clock icon at the top of the interface, and select a countdown time.

After selecting the countdown time, click on the white dot below to take a normal photo. At this time, the system will automatically count down and take photos after the countdown is completed.