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It's a subjective thing...too much stretching can add further noise to your piccie. Too little and not enough detail comes out. That's why you need more and longer subs. The longer your subs are and the more you have, the better your S/N ratio will be, the more you can stretch your image to get the results you want. It's subjective, as I mentioned, in that you'll be the judge of what you think is the best you can get out of a series of subs. It all comes with practice and experience. You never stop learning or improving your pics.
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