Canon 580EX II Flash The Canon 580EX II, top-of-the-line professional external flash unit is one of the most important pieces of equipment that we carry in our bags when shooting an event such as a wedding. Actually, we usually carry several of them. External flash units allow us to use flash-light more creatively which of course makes for more interesting and flattering photographs. Powered by WebNog | Maverick Photography © 2011. This website and its contents are protected by Canadian law.