Featuring wireless slave TTL functionality and full Canon E-TTL / E-TTL II support the Flash Light for DSLR Camera ? ? ? ? ? Yongnuo 565EX ?Speedlite from Yongnuo can increase your lighting capabilities by offering an off-camera option. The flash?s general abilities include auto zooming from 24-105mm and an impressive guide number of 190? at ISO 100 and 105mm as well as tilting from -7 to +90? and 270? of rotation. When used off-camera it is easily triggered by camera?s with built-in commander modes or other speedlights with master TTL functionality or as a simple optical slave with instant sync or skip pre-flash settings.