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I image with my 8" Newt, using an old 60mm (focal length 700mm) tasco refractor as a guide scope and an unmodded toucam as a guide camera. So far, there hasn't been a time that I haven't been able to find a guide star. I would say the limiting magnitude of my skies would be around 4.5.
In terms of tracking, have a look through my pics. I can get out to about 15mins (if I push it), with round stars. I have to manually guide in DEC due to issues with my mount. I also tend to get star trails if the object I'm imaging is close to the meridian. This is due to slop in the focuser of my tasco.
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