Another use of two cameras can be such that the watch can automatically monitor the face and reduce the wide field of view so that the final image focuses on the face. This will allow users to move their hands somewhat freely, without having to worry that FaceTime will not see them. And if the interlocutor uses Apple Vatch, they will be able to properly see his face.
The description also indicates that the device can use only one camera or different lenses, such as a zoom lens, a macro lens, a zoom lens, a colorless flashlight, a ribbon stain lens, a stereoscopic lens. They can appear in different tapes, enabling users to choose the ones that suit their needs, as Apple intends to use cameras to record all types of videos, and not just FaceTime.