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Hi John - The zenithstar 80 (or orion express 80) are good quality and not too expensive and weigh in around 2kg. They might be considered "overkill" for simple guding, but probably not that much more than the alternatives - and you know sooner or later you'll want to flip between them and guide through the Vixen while taking some spectacular wide-field images through the "guidescope".
cheers,
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