> Since the 6X7 format contains the 6X6 format it is no easier to crop the 6X6 > than the 6X7. You don't have rotate the latter either. You get a 6X6 > regardless on how you rotate the 6X7.
This doesn't really translate to the market. The original Mamiya 6x7 was the RB, which stood for "Rotating Back." The whole point of the feature was so that studio photographers would not have to remount the camera on their camera stands to change the picture orientation--and the reason _that_ was important was that it was one of the basic objections pros had to the 6x7 format. In practice, it's not particularly easy to anticipate a particular crop in the viewfinder. In the studios I've worked in, when a specific crop was needed, for instance for a magazine cover, we use a view camera, draw the final proportions precisely on acetate, and tape the acetate to the ground-glass. For most photographers, when they look at a 6x7 viewfinder, they will tend to compose to a rectangular frame. --Mike
