im at a complete loss and nikon tech support was no help either. im trying to use my sb600 off camera and my images come out very underexposed. the sb600 does fire so i believe ive got all of the commander mode settings correct. with the sb600 mounted on the camera it works perfect in ttl. nikon says this is basically not possible that it works correctly on camera and fires off camera but incorrectly. i suspect but dont know for sure that the sb600 is firing AFTER the shutter has already closed. i appresiate any help i can get. thanx all.