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This thread was split from Doug's for sale thread.
I agree with John's comments. Properly cooled and collimated Dob will do show a lot more detail on planets. Proper cooling may require more effort than you think. I never realised the full potential of my 8" Dob till I fitted a a 4 watt fan behind the mirror. Before I did that, small refractors often outperformed my Dob especially on planets (Saturn and Jupiter), to my constant disappointment.
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