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While I am not suggesting Theo isn't right, it was always my belief that a refractor needed a reducer or flattener that was sort of "designed" for a refractor. The SCT versions correct and reduce, correcting the problems that are inherent with the SCT design.
In my case, I use an AP67 CCD Telecompressor, and this is my refractor(s) as well as my Maksutov.
Best option if you can is to try one or two. There will be a glut of SCT styles out there, borrow one, and try it.
Gary
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