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I advise to start with the 25mm as it has less magnification & will be easier to focus.
When you move the focuser knob do you see the shaft of it going in & out?
When you tried looking at the moon & were moving the focuser could you see the moon come close to focus then go back out of focus? or was the focus not really changing to your eyes?
Lastly do you know about/how to collimate?
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