The Yongnuo ST-E2 will wirelessly trigger Canon 580EXII, 430EXII, and Yongnuo YN565EX E-TTL SPEEDLIGHT flashes. It will also pass ETTL information to the flashes, and thus the flashes will fire at the correct power level for correct exposure. One of the biggest benefits of the Yongnuo version of the ST-E2 is a strong illumination lamp to enable the camera lock onto the subject when Auto Focusing.
When using off camera flashes in low light conditions, this is of great benefit in speeding up your shooting. We demonstrate the speed of the AF in almost complete darkness.
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