I've got a question about lunar stacking. This might be totally obvious... But last night I had very little battery and just done a quick 10 shots of the moon which I plan on stacking using registax... I understand that these are merged to bring out more detail... I also understand that for noise reduction focus stacking looks for the higher signal colours and makes these stronger so to speak and dampens noise.. If I am stacking for more detail. What's the difference between taking 2 identical photos (tripod and a burst shot) and copying the image and stacking it as a duplicate? (is the only difference the noise in the image appears in a different location?) I know this is a very newbie like question, but I don't fully understand how it works. Thanks.