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Your 5 min subs definitely look sharper - my hunch is less guiding error. It should require less stretching of the image, so theoretically the tonal range should be better.
I did a similar experiment on the weekend with 10 vs 20min Ha exposures. I'll have to process them properly and have a look. I did it mainly to see if stars were filling the pixel wells on longer NB exposures.
DT
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