About: http://webisa.webdatacommons.org/417995556

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	A few months ago, I used tubes with my Canon 135/2.8 to get a shot I could not get with anything else in my bag, including a 50/1.4 which is theoretically better to use with tubes.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com