About: http://webisa.webdatacommons.org/16917441

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	In recent years where optical instruments such as video cameras and digital cameras are prevailing, zoom lens systems which are capable of changing focal lengths are adopted for these instruments at an increasing ratio.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com