Different manufacturers clearly used a slightly different frame size for their nominal 6 x 6 cm (2¼ x 2¼ inch) cameras. I have three such cameras at present and so I measured the frame sizes: Here they are added to my measurements on negatives:
|Frame Size (mm)|
|With direction of travel||Across film width|
Are there measurable differences in 24 x 36 mm frames from 35 mm cameras which would be useful for identification?
I hope this method proves useful to others faced with the same problem.