About: http://webisa.webdatacommons.org/367221807

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	Hamilton was the first to utilize the advantage of this type of arrangement, which allows for weaker lens surfaces than standard achromats, due to its power being mostly produced by the reflecting surface.
http://www.w3.org/ns/prov#wasQuotedFrom	telescope-optics.net