The fisheye got back focus of ~45mm. But normal medium format camera has longer back focus. Thus, a custom made camera body needed so that the fisheye can focus on medium format film pack.
The film pack I used is Mamiya SPro. The 16mm fisheye in 135 format camera is diagonal fisheye. When it on a medium film, it became circular fisheye.
See the picture below is how the camera look like.
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