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Indeed... too much can happen in a 45min to 1hour sub.. I've ran a few 1hr subs in Ha from home, they've come out fine, the issue was the amount of satellite trails and planes that can destroy the image.. every sub had at least one satellite trail. 20 min subs are obviously still affected, but not to the same level. and losing one 20min sub is a lot less painful than losing one 60min sub. Whats more, if you were to set up and have the scope running 10 minute subs, and a large gust of wind came for arguments sake, every 50 minutes, you'd still get 300 minutes of data in 6 hours, and one sub per hour trashed due to the wind gust shaking it about. If on the other hand you were doing 1 hour subs. you would wake up in the morning to find 6 trashed subs, 0 useful data for a whole nights imaging.. Despite the fact that as you say, its not as painful as losing subs out at dark skies, one full clear nights worth of data down the drain is painful, regardless of whether its from dark skies, home, during the new moon cycle.. its still time that could have been used to collect useful data.. I'd definitely go with Marc's thoughts.. shorter subs, but lots of them... 20 min should be plenty deep enough through 13nm Ha... Just, Plenty of them.. 18 of them should do the trick... 6hrs data.. obviously, the more the merrier, you can then be a bit more aggressive with sigma rejection stacking etc.. You'll end up with better images if you take more subs in any case...
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