About: http://webisa.webdatacommons.org/44727756

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	Quality wise not too sure, i have lenses and telescopes with both types of glass, and both perform well enough.
http://www.w3.org/ns/prov#wasQuotedFrom	dpreview.com