Think about the six levels as being the "sharpening" of a pixel box ie 6 x 6 pixel box down to a 1 x 1 pixel box.....
I find on Ha solar imaging that I only use the #4-#6 level to "correct" for seeing conditions, then less and less of the others.
I think I use the #1 -#2 about 10% of the time and only then when the image already appears pretty tight and clear...just to get that extra tweak.....
If the image starts to appear "over cooked" - you've definately gone too far - back off.....
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