I have been using a Pentax 67 camera for years, and, now, I'm thinking of changing to the digital Pentax 645z. I have several 67 format lenses, and I would like to use these with the 645. If you mount a Pentax 67 lens on a Pentax 645z camera using the appropriate adapter, when you look into the camera's viewfinder, do you see a full rectangle, or is there a circular crop in the center? Any advice would be welcome. Many thanks, John P.S. Also, I would like to use my Pentax 67 lenses on the Pentax K1 camera. When I asked about this at the Pentax booth at last fall's PhotoExpo in NYC, I was told that there is no adapter for this. I can't imagine that this is true. Does anyone know the answer?