The good review of my Vorschreibers I can not confirm. The flash does what he wants. I shot about 20 shots in i-TTL mode. The recordings were rare good and mostly underexposed. And then the battery was suddenly empty. In any case, the display has indicated it so. I have the batteries from fun times tested, all of which had yet 1900 mAh, and a voltage of 1.45 volts. I sent the flash back. Or maybe it was "only" defect, but an exchange for the same was me then too daring. I have now ordered a flash of Nissin, and hope that I can cope with it better.