Editing Normal lens (section)

== 'Normal' lenses vary for different formats ==
For still photography, a lens with a focal length about equal to the diagonal size of the [[Photographic film|film]] or [[Image sensor|sensor]] format is considered to be a normal lens; its angle of view is similar to the angle [[Subtended angle|subtended]] by a large-enough print viewed at a typical viewing distance equal to the print diagonal;<ref name="stroebel" /> this angle of view is about 53° diagonally. For cinematography, where the image is larger relative to viewing distance, a wider lens with a focal length of roughly a quarter of the film or sensor diagonal is considered 'normal'. The term '''normal lens''' can also be used as a synonym for [[rectilinear lens]]. This is a completely different use of the term.{{citation needed|date=April 2017}}