I read that the original Diana F did have a smaller frame, like 44mmx44mm
The Diana f+ I have is missing its accessory masks/inserts and it does make a full sized square negative (could be 56x56).
I made two mistakes with my first roll through. I used ASA 100 film instead of 400 and only the ones in bright sunlight or with a flash came out at all. Then I had the indicator window set for 16 exposures instead of 12 and everything was overlapped.
If anyone has leftover inserts they don't want I would take them
Oh yeah, Jon those are very nice shots you attached above. Very impressive. I really like the one of Yosemite Falls.