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Old 18-05-2016, 12:21 PM
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Atmos (Colin)
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Join Date: Aug 2011
Location: Melbourne
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There are thermal pockets in the atmosphere that change over the course of seconds to minutes. The atmosphere in fluid dynamics works as a convective system. Warmer thermal pockets will rise up causing localised seeing changes, depending on the size of these pockets, where they are in relation to where you're looking and temperature variations (greater thermal differences causes faster moving pockets).

Longer subs increase the chance of imaging through these pockets, ultimately each sub is only going to be as good as the poorest bit of seeing you had over that period.
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