I have always assumed that 6x9 was a euphonism for 2 1/4 x 3 1/4. Conversion of cm. to in., however would result in 2.36x3.54". Is this the actual size of 6x9? I have never seen sheet film in this size.
The reason I am raising the question is that I have a Jobo 3012 drum that will process (12) 6x9, (6) 9x12, and (2) 8x10 sheet film. The drum has sets of raised guides down the sides where you can slide in two 6x9 sheets between them. However, there is nothing to keep them from moving about and sliding out of the guides when processing. I am thinking that if the film were another .25" wider that the additional compression would keep it in place.
Ah well, maybe I will just go back to tray processing and use the drum for 8x10s.
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