The EF-530 DG SUPER is a multifunctional shoe mount type flash that provides a large amount of light, featuring a guide number of 53/m (174/ft) w/ISO 100. 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, which come in very handy for bounce photography; FP flash, which is capable of synchronizing the flash illumination with high shutter speeds; and the rear curtain synchro flash mechanism, which makes delayed synchro photography possible