About: http://webisa.webdatacommons.org/415860229

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	U.S. Pat. No. 6,616,347 to Dougherty discloses a number of dual camera systems for autofocusing as prior art, although they all have problems including being too bulky, costly, and heavy.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com