Perhaps someone would be so kind as to explain MF formats to me, assuming they can understand the question that is! Here's the issue that's confusing to me: I believe that a roll of 120 film is approximately 6cm high by whatever length (120cm?) so if for instance one is using a 645 camera does that mean the pictures are 6cm high by 4.5cm wide or does the camera rotate the image 90deg. to give an image 6cm wide by 4.5cm high? Thanks folks.