Thanks all. It was just out of interest as in academic interest to extend my knowledge. My Durst 605 does up to 6x6 and if I were to go for a modern MF such as a Pentax or Mamiya,( I have an old 6x6 Agfa) I am sure I'd settle for 645.
Bob, are you at least a black belt at karate and can you live with me permanently? If I ever suggested a hole in the ceiling plasterboard, I'd need you to as protection against the wife
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Mike