About: http://webisa.webdatacommons.org/82583552

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	Your error is a common one as can be seen in this thread, but there are enough people chipping in with explanations as to why the equivalent applies to the aperture as well as the focal length (if you are actually interested).....
http://www.w3.org/ns/prov#wasQuotedFrom	dpreview.com