Hi Campy, I've had a Kowa 6 and also have a Super 66 at the moment. That doesn't make me an expert, and I'm not sure I have the answer for you here. But firstly I'd check very carefully that the lens is securely locked in place, with the locking ring all the way home. For the lens to mount correctly the two pins have to be rotated around to the index marks, and I assume you do this. Also it's important with these cameras to wind on completely, because if not the button will not 'fire' for the next exposure. I'm not sure this is the answer to your problem, but from past experience I feel that it has something to do with the correct mating of the lens with the body. I hope this helps, and if I can think or anything else I'll let you know.