Hello: I am a new user of the Mamiya RZ67 system. I have a pile of equipment I have obtained on ebay and I suspect the problems I am having are related to the PRO I body I have. I have one RZ lens and One RB lens. The problems: 1: The shutter speeds with the RZ lens all work except the Bulb setting...when I trip the shutter, and hold the button, the shutter just opens and closes as if it were set on the mechanical back-up. The long exposures all work (Up to 8 SEC) and the time exposure setting also works with or with out a cable release. Is this likely a problem with the lens or the body? Problem 2 is with a Power Winder II I just obtained: (ACTUALLY 2 problems) One seems to be related to the shutter release button on the camera: After making an exposure, I have to repeatedly tap the shutter button or slowly turn the button's locking mechanism before the winder will activate. Problem 2 with winder: If I load a fresh roll and push the start button, it will load and advance to frame 1 okay, but for any subsequent frames, the counter will advance, but the winder gets kinda stuck and keeps trying to finish cocking the camera. If I help it along by pushing on the manual advance lever while the motor is running, as if I am cocking it without a motor, the winder stops clicking and catches up. As I said, this is all used equipment, new to me, and I am not intimately familiar with the RZ system. I'm trying to confirm that I got a bum Body. Thanks!