The focal length, in millimeters, of the camera’s simulated lens.
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 9.0+
- Model I/O
In a physically based camera, field of view is based on the focal length of the lens and the vertical aperture of the imaging surface (film or sensor). Changing the
sensor property updates the
field property to the corresponding value, and vice versa.
The default focal length is 50mm, corresponding to a field of view of 54 degrees, and vertical sensor aperture of 24mm.