The Viltrox JY-680 is a good all-round flash that?s easier to use than some popular rivals. It packs a range of useful features making it capable both on and off the camera.?The output seems to be around as powerful as a Nikon SB-600 or SB-800 but this hasn?t been rigorously tested. For events photography this speedlight is especially well-suited, as changing and viewing power levels is effortless in dim light. I discovered this when thrown in the deep end: my Nikon SB-600 capacitor blew during an event and I needed a quick substitute!