This is probably a niche coma corrector / 0.85x reducer so I thought I would provide some more info.
This is a link that I found useful:
https://www.stastrophotography.com/s...ograph-review/
This sharpstar newtonian uses the same corrector and the author describes the adapters he used for an m54 connection to the asi6200. It is one of the reasons I purchased a number of m68 spacers. However I no longer plan on purchasing a full frame camera with an m54 connection.
I have a custom made adapter m68 to m48 made by ts optics that works with dslr cameras.
There is also an m82 extension tube I had planned to buy to replace the makeshift lens hood spacer from ts optics that would be perfect since it would screw onto the m82 male thread of the corrector:
https://www.teleskop-express.de/shop...mm-Length.html
Here is a link to some images that inspired me to try this corrector in the firs place:
https://www.astrobin.com/search/?q=%...x%20Reducer%22