About: http://webisa.webdatacommons.org/18750031

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	Although the mechanism is a bit different from your lens, the effect is not unlike the aperture in your lens.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com