The vertical size of the camera's imaging plane, in millimeters.
- iOS 11.0+
- macOS 10.13+
- Mac Catalyst 13.0+
- tvOS 11.0+
- watchOS 4.0+
focal properties determine the camera's horizontal and vertical viewing angles using terms that model physical camera devices. (Alternatively, you can work with viewing angle directly though the
field property.) For example, with the default sensor height of 24 mm and default focal length of 50 mm, the vertical field of view is 60°.