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Steve, please as a minimum, dont consider anything cheaper than a 6" dob of GSO or skywatcher make. Anything less is going to be a frustrating waste of money where you will be fighting wobbly mounts, bad focusers and poor optics instead of enjoying your scope.
You certainly should avoid short tube type newtonians which have a long focal length. These scopes have a built in plastic barlow and are typically very poor optically, and almost impossible to collimate.
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