Harry0 wrote:
There have been little plates made to "convert" cameras like that, say from 6x9 to 6x6, or 4.5x6 (centimeter).
And because of the lens and camera it was kind of acceptable that the far edges would be kind of soft.
You could make plate for your camera to restrict it to a 6x6 on 120 film, and get good useable shots.