Ef 610 dg super ef 610 dg super is a multifunctional shoe mount type flash designed to work with digital slr cameras from most popular manufacturers and features a powerful guide number of 61 among the diverse features of this flash are the autozoom function which automatically sets the illumination angle in accordance with the focal length of the lens ttl exposure control which automatically regulates the amount of light bounce and swivel head functions catch light panel which creates a catc