Reddit reviews Fotodiox Pro Lens Mount Macro Adapter Compatible with M42 Lenses for use with Sony E-Mount Mirrorless Cameras
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Mounts M42 Screw Mount SLR Lenses to Sony E-mount mirrorless cameras; infinity focus or beyond allowedBuilt in macro focusing helicoid provides macro focus on any lensPrecise fit and solid connection; lens has no play, gap or wiggling when mounted on adapter and no adjustments requiredPrecision all-metal construction with chrome plated brass mounts for secure and solid fit24-Month Fotodiox warranty
Simple soft bellows not my camera build but it shows the idea. I know that's also a view camera/studio camera and you want a point and shoot still if your only going to do the 90mm you don't need a great deal of travel soft bellows would work. You would just have to find the right support for the lens.
Thinking point and shoot your lens is so wide shooting 4x5 or larger you could almost do a simple fixed focus camera.
There is a handmade large format flicker group look through the picture pool and in there are some good camera builds. From things that are ruff but functional to elegant ideas.
I would totally be about salvage mechanisms from 35mm or rangefinder lenses. Find a simple lens with a great take apart guide, buy a copy with fungus/missing elements, salvage a helical.
Good luck. Show us what you make and have fun.
Edit: are you married to having a lensboard? You could do Copal 0 to M42 adapter then M42 + helicoid to a mirrorless style camera. Mount to the body using a cut up rear lens cap as a receptacle. I might worry the longer helical would block the edges of the light cone inside especially for such a wide lens. I might worry is too many connectors.
Edit 2: Copal 0 to just M42 helicoid?