About: http://webisa.webdatacommons.org/342550730

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	At the same time, ???a surface close to the aperture stop tend to affect or benefit spherical aberration, surfaces located further from the stop can help minimize some or all of the off-axis aberrations such as coma and astigmatism???:
http://www.w3.org/ns/prov#wasQuotedFrom	qi-hardware.com