Always used Canon but got an offer for a cheap D3s from a pawnbroker shop. Bought it and tested it, however, it doesn't seem to autofocus. Just one AF-point shows, and if I set it to automatic (white triangle) I can see a hint of the other rectangles but it doesnt take any pictures instead. it also takes exposures after two clicks as if its in bulb mode. I have tried different settings but its always the same - while I don't know much about Nikon systems I would expect it to work different if I change the settings. Any help? If the camera is not working I can always turn it back.