Sigma EF-610 DG ST Flash

EF-610 DG ST is multifunctional shoe mount type flash, designed to work with digital SLR cameras from most popular manufacturers and features a powerful Guide Number 61. This flash unit provides fully automatic flash photography for digital SLR cameras with automatic TTL exposure control. It combines a convenient array of functions with ease of handling, and include an Autozoom function that automatically sets the optimum illumination angle between 24mm and 105mm, as well as offering bounce and swivel capability.