The Bower SFD35 Digital Auto-Focus Flash is a fully dedicated E-TTL / E-TTL II program flash designed to work with the Canon cameras for improved flash photography. Designed with professional and amateur photographers in mind, the SFD35 flash is equipped with a guide number of 112' and has a zoom range of 28-85mm. Also the head will tilt upward 90° and rotate right 150° and left 180°. An AF assist light is available in low light situations and it has a recycle time of 4-6 seconds at full power. Additionally, it runs on 4 AA batteries.