About: http://webisa.webdatacommons.org/67464764

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	This lens was a predecessor to the APO Sironar-N series, but I do not know what changes may have followed in the interim between your lens and the APO series.
http://www.w3.org/ns/prov#wasQuotedFrom	largeformatphotography.info