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Your 8 inch dob is going to be way faster to set up than any refractor and will see more. Remember it is a light bucket the bigger the bucket the more you see. 90mm refractor will give faint cotton wool fuzzies the 8" will show details and structure. The best scope is the one you use. Head to a star party and take a look through all the scopes you can. You may be surprised how good the 8 stacks up. Must agree give it a full year, all 4 seasons and then think about upgrading.
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