About: http://webisa.webdatacommons.org/420422293

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	Sealife, Ikelite, Sea & Sea and other manufacturers allow use of TTL, where the camera sends out a very small pre-flash to meter light in the scene before triggering the full flash at appropriate power.
http://www.w3.org/ns/prov#wasQuotedFrom	uwphotographyguide.com