About: http://webisa.webdatacommons.org/293743183

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	A focal length of 50 millimetres is considered to present a normal vield of view on a film or full frame digital camera, and for that reason is a popular choice of a prime lens.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com