Assertion: camera lens's length | /r/HasProperty | f
Facets:
Source sentences:
text: Focal length (f) and field of view (FOV) of a lens are inversely proportional.
text: The focal length (f), the distance from the front nodal point to the object to photograph (s 1 ), and the distance from the rear nodal point to the image plane (s 2 ) are then related by: