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Steve: The subs were kept short due to the moon, as for the M16 subs being only two minutes, that was to avoid blooming on the stars.. The ST9E is VERY sensitive in that respect.. Not withstanding the scope being F/8, i could clearly make out the pillars in a 3 second sub.. could easily make out the dust lane in Cent A in 1sec... Its QE is the 2nd highest of all the SBIG ST series cameras, and due to it being NABG, it very quickly blooms on brighter stars... I think with a 3~7nm filter it will be much better, however I think that would require external guiding in order to get 5~10 minute subs...
I forgot to mention, I had the sbig @ -10c for the images.. used auto darks, no bias/flats used..
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