OK Tony the 250K with mods will work well the Hutech FR's. There is something about the Kletsov optics that makes them behave more like a really good refractor.
I found that the Hutech focal reducer (7887) worked superbly with the TAL 200K. You have seen the pictures! I can't predict how the 250K will work. I would replace all the standard fittings behind the back plate and replace it with BORG parts.Let me know and we can design something. Not cheap!
Bert
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