About: http://webisa.webdatacommons.org/48105134

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	(3) a system including a mirror between the objective lens and the focal plane thereof, and a pentagonal roof prism between said focal plane and the eyepiece, as in the finder system of single-lens reflex cameras; and
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca