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Sigma EF-500 DG Super SO-ADI TTL Flash is designed to work with both AF 35mm SLR and Digital SLR cameras for advanced flash photography. The EF-500 has bounce and swivel head that can be tilted 90° upwards, 7° downward for close-up photography, swivels 180° to the left and swivels 90° to the right. Its Autofocus Assist helps the camera to focus in low light situations. Incorporated "multi pulse" technology enables reduced power setting from 1/4 to 1/64 and the pulse frequency of the flash can be set from 1Hz to 100Hz. To help save battery life, the auto power off mode activates within 80 seconds of standby time.