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A couple of thoughts.
I have been using a 5nm Ha from Astrodon for a while now and prior to that a 7nm Ha from Baader.
I find the 5nm to be better than the Baader (I may have gotten a bum Baader as I often had lots of black spots in the Ha images with it).
I use 10 to 15mins with the 5nm Ha and it works fine, nice bright images usually. So tracking is not an issue nor 30 minute subs an issue.
Not sure what the advantage of a 30 minute sub with Ha - with S11 for sure. Even O111 is reasonably bright.
On another point I havn't found that outlier data rejection of CCDstack to be that useful. Perhaps I am doing it wrong. How do you get it to select satellite trails or even hot pixels or odd shaped stars? It seems to not pick them up at all or pick "everything up" to be corrected. Also median combine gets rid of satellites fairly well.
Any tips there Jase? I have the Adam Block DVDs but seem to have misplaced the CCDstack one.
Greg.
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