well one of the quickest ways is to hold the camera with no T thread and slowly move it back untill you see the moon focus (considering you have something like live view this will be easy) and then once it has moved though the focal point and blurs again that should be the aproximate distance you need.! good luck cheif you have some really nice dark skies where you are i should know im a born and bread NT man myself.! that lived out on the stations!
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