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wedge etc
I think you would find a wedge AND an autoguider would be needed for long exposures- if I assume your cpc is fork mounted.
Saying that a wedge could get you maybe a bit longer if you were really accurately polar aligned.
Autoguiders don't have to be expensive- any old webcam could be used as one with the right nose piece and software.
Plenty of opportunity to grab second hand ones as well on this web site in the classifieds.
Software- free is PHD guiding- will use webcams or most other guide cams and is simple to use.
Good luck mate!
Graham.
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