Will RB67 finders work on an RZ67? If I had an RZ body with an AE finder, is there a manual metering mode that could be used with RB lenses (if there is, I assume the lens would have to be stopped down)? What are the differences between an RZ67 and an RZ Pro II? What kind of reputation to RZ lenses have as far as reliability of their shutters? TIA for any input.