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Mate I have recently learnt the value of collimation, get someone to check that for you, it can significantly improve the viewing quality.
I have seen the dark patches and polar caps on mars with a 6 inch dob at 120X, you should have no trouble spotting those things. Are you sure you are in good seeing conditions? Are you out in the sticks with no moon? That can have a big effect on the view as well.
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