Definitely only one way to find out with the 72 rolls! I'm game! Though I think you might be on to something with the film advance and thickness of film.
Re McD - that's from the EES2 correct? Rather than the EES? I forget which was which now but was that the one with some exposure issues?
But yeah more tiny frames -
Pen FT shot with a OM Macro lens (f3.5 one). The Pen F/FT/FV series have a collection of adapters for various lenses for other companies including their own:
Looks like redscale a bit but it is xpro'd slide film.
The recently departed Elephants from the Toronto zoo, shot with Pen FT and Polypan F:
And a boring picture but one shot with one of my favorite Pens that I regretfully rarely use, the EED. Beautiful camera (at least to my eyes). This was mostly to see if I could get some more Xpro'd slide film colour out of expired redscaled Kodak Gold shot at 12ISO:
As maybe those shots indicate, the half frames for me are about experimentation & fun. They are what got me and my wife back into film. We have other cameras, SLRs and the like, but there is something inherently joyful about half frames that keeps us coming back.
And here's a couple of my wife's photos with the EE2, the camera that started our half frame addiction:
That's with the Lomography slide film "Sunset Strip", shot at 200 maybe?
That's expired Portra NC 160, shot at 100.