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The main factors will be the type of camera you intend to use and the image scale you are hoping for. The newt will need a coma corrector for imaging at f4, but for the same image scale you can use a smaller sensor and much cheaper filters to get fairly similar results. For the cost of an rc8 you can probably get a larger fast newt, too... For visual, the newt would probably be better, although there's not likely to be much in it.
Cheers,
Andrew.
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