I am in the process of modifying my device to use the Raspberry Pi HQ camera together with a quality lens.
For this I have relied on the @jankaiser optical system. Thanks for sharing.
My old lens had a focus ring. The new lens is Rodenstock Rodagon and it does not have such a focus ring, you have to focus by varying the distance between the lens and the film frame, so I have to devise a positioning system for the optical assembly in the xyz axes.
I also had to adapt the software to change the old Raspicam V1 camera for the new HQ camera.
I leave some photos of the current state.
My new optical system and camera. From left to right: Rodenstock Rodagon 50mm f 1: 2.8 lens - M39 to M42 adapter ring (not seen in photo) - M42 helix ring, 17 to 31mm extension - M42 28mm fixed extension ring - M42 Adapter to C Mount - C to CS Adapter Ring - Raspberry Pi HQ Camera.
Assembly that I have made to test the new system, photographing graph paper.
Image obtained from graph paper about 77 mm away from the lens. As you can see, with an image of approximately 6x5 mm, the entire camera sensor fills up. I think it’s a very good raise. A Super8 frame measures 5.7x4.2mm. There is enough space for the frame and some margin in the surroundings.
Regards.