Place a wide angle, that is longer focal length lens in the scope in daylight and focus it and centre on some distant object, a tree, blg, tower etc.
Then use the adjustment screws on the finder to centre it on this same object.
Change to your next higher power lens, that is shorter focal length, refocus and centre, and repeat with the finder adjustment.
Next wait for evening and a bright star or planet to appear and centre it in the finder first this time. It should be somewhere near centre in the lens also. Centre it properly in the lens and make a final adjustment on the finder.
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