On 10th October 2008 I managed to get 3 hours and 40-minutes worth of H-alpha data on the Heart nebula in Cassiopeia using 10-minute subs.  The Moon was causing all sorts of trouble and the seeing was poor which led to pretty mediocre data for Noel to work with.  However, Noel eventually managed to work his magic even with this one to give this very nice high-contrast result:

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