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The CPC would be the way to go, but before doing any longer exposure
imaging you would have to buy the optional wedge.
Computerised scopes have inbuilt power sources, but almost nobody
uses them because they run down pretty quickly. I have been using
car batteries for the last 40years, but some people use purpose built
Celestron power tanks. If viewing at home, you can plug into the mains
and step down to 12volts.
raymo
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