My opening question pre-supposes that the 6x7 or 6x8 screen show more in the longer dimension than is recorded on the film. This probably isn't so is it? So if I've got things arse-about-face, does anyone know whether the RB67 6x8 screen shows more of the scene than the 6x7 screen?

Should I just frame right up to the edges? Can anyone advise on how they frame a shot using a 6x8 back? Or is it time to do some testing?

This thread is in danger of getting a bit solipsistic.