So I'll get an even border all the way round using 6x7? It's such a hard decision what to choose, but I'm glad I've incessantly asked questions here before going and buying a camera. Spending all that money on big sheets of FB paper I don't really want to go cutting pieces off. That seems a bad excuse I suppose really seeing as different proportions all have their own aesthetic. A "perfect" ratio to maximise the amount of the paper printed on sounds good though, so perhaps I'm better off looking for a 6x7 which are more readily availaible. I'm truly set on buying a Bronica 645rf. Does the 6x4.5negative result in a perfect print on 12x16" which is the size of prints I'm going to be primarialy making? yes right? My mind switches every 5 minutes between what to get. As usual, thanks for your time and patience replying.