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A guide scope will work with almost any telescope.
The issue/ problem is getting it securely and rigidly mounted onto the scope so that NOTHING moves....
With a Newt and other mirror scopes (SCT etc) there's always the possible problem that the mirror will shift/ slide/ flop during the exposure and still cause elongated star.
As an example....I initially used the ST80/QHY5 guide scope on a RIGID support bar on the C9.25 to guide my spectroscope...
I found even the slop of the 1.25" nosepiece on the guide camera gave problems and had to go to T thread adaptors...It worked very well, but for me on the C11 the beamsplitter/ guider is even better.
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