This is the vertical field of view; horizontal
FOV varies depending on the viewport's aspect ratio.
Field of view is ignored when camera is orthographic (see orthographic).
Some VR SDKs have fixed field of view values that are used for VR cameras. When VR is enabled with those SDKs, this property will always return the value from the SDK. You will see a warning logged if you attempt to set the property and the value will be ignored.
関連項目: camera component.