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HI Steven like you I am new to astronomy i brought the exact same scope six months ago first do not try to clean your mirrors if you can see your refection in them they are fine if they ever get dirty use compressed air to clean them and with a collapsible dob scope you will need a light shroud will give you much better viewing as for the problem you are having i think it is to do with your focusing knob when you turn the nob does the eye piece move in and out if not there is a screw in-between the two focusing knob that need to loosened hope this works i will have a play with my scope tonight to give you more suggestions
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