A couples of days ago I fixed the tilt of the camera that I had. The tilt is caused of the bayonet of the adapter isn't tight enough. I thought about a lot of different solutions including a new 3D-printed adapter. But after a while I choose a very simple solution, a string and a spring that force the camera to be in correct angle and position.
Have a look at my photos from my Pentax 645 project:
http://www.astrofriend.eu/astronomy/...645-300ed.html
When the camera is out of focus the shape of the stars look very strange, but when in focus okay, all the way out to the corner. But must get the auto focus function to work better and calibrate the temperature compensation to get it perfect.
In the future I will 3D-print my own adapter and include some more funtions into it.
Lars