Yongnuo YN-565EX TTL Flash Speedlite Flashgun For Canon 600D 550D 500D An excellent companion for your top of the line Canon digital SLR camera, letting you produce amazing and breathtaking photography Super fast recharging cycle, 3 second charging cycle after a full level output, can be accelerated by an external power pack Auto/Manual zooming, covering a length range of 24 to 105mm and supporting full-frame and half-frame cameras With its advanced TTL functions, wireless flash system, and many other capabilities, Modeling light function that sends out continuous flash every second, TTL Flash with large guide number: GN58@ ISO100, 105mm,