Well, I just sat down and actually did the math between the 6x4.5 and 6x7 negatives and the 6x7 is 55% bigger. WOW!
Okay, best I can tell the RB67 models are the Pro, Pro S, and pro SD. I don't know if there are more. How much interchangeability is there across the model lines? Other than newer and incremental improvements is there a must have or must avoid model. You RB aficionados, if you're picking the best of the bunch which model would you choose and what lens to start with? I'm now leaning toward the RB.
Robert