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Wow, what a deal! I use one of these as a guide-scope with a ZWO ASI120MC, I use a diagonal to get enough backfocus. I dont use the original rings that come with it I spent a bit of money and bought some losmandy guide-scope rings and a rail to mount it all.
You can get pretty good focus with it but it sucks I need to use the diagonal. I use PHD2's star profile window with a star that isnt clipping to get the focus pretty well spot on.
There are almost always good stars to guide off in field of view despite light pollution.
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