About: http://webisa.webdatacommons.org/31744979

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	Lens functions that describe basic lens types with point and circular focal regions, as well as certain more complex lenses and advanced capabilities such as folding, examples of which are described by Carpendale.
http://www.w3.org/ns/prov#wasQuotedFrom	google.de