Assertion: telephoto lens's length | /r/HasProperty | altered
Facets:
value: mechanically
type: MANNER
value: without removing the lens
type: MANNER
Source sentences:
text: Zoom lenses are a special case wherein the focal length, and hence angle of view, of the lens can be altered mechanically without removing the lens from the camera.
text: Unlike a prime lens with a fixed focal length, zoom lenses have a variable focal length that can be adjusted.