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You can use an OAG, but if its hard getting a guide star to be round or its hard for it to calibrate on, then use a small Mak spotting scope.
You can grab a 90mm Mak with over 1200mm of focal length, which is ample for your guiding needs, plus its small and very light.
As the max weight, i would assume thats total, which includes eveything.
Theo.
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