About: http://webisa.webdatacommons.org/321863514

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	Because of its redesigned series of lenses, Sigma developed proprietary software (SIGMA Optimization Pro) and an optional USB docking system that allows you to update the lens' firmware and adjust its parameters such as focus.
http://www.w3.org/ns/prov#wasQuotedFrom	42photo.com