So about 6 months ago, I bought a nikon sb 50... then it stopped working.. so I bought new batteries for it... put them in, nothing.. i figured it was dead (it was used) i didnt throw it out though, I kept it... just 2 seconds ago.. for the hell of it, I took the batteries out, and switched them around ... guess whats working... so thats a bonus.. now I have 2 working flashes...I'm very happy. hmm can someone tell me why its not working with my nikon sc-29 wired hotshoe?? and strangly enough, its not working on my d40 either... (meaning right on the hot shoe...) Tres bizzare... when its not plugged into any of the cameras. and the flash goes off from one of the other flashes.. it goes off.. does it have a built in sensor or something? wow this flash totally has a built in slave... to awesome.. that means I dont need to get a splitter!!!