Assertion: normal lens | /r/HasAspect | an angle of view
Facets:
value: between 40°
type: LOCATION
value: between 50°
type: OTHER
value: typically
type: DEGREE
Source sentences:
text: A normal lens typically has an angle of view that is close to one radian (~57.296˚) of the optical system's image circle.[citation needed]
text: Normal lenses have an angle of view of between 40° and 50°.