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Hi Entropy,
If that was a 50 minute sub then I think your alignment and guiding may be fine. I usually go 5 to 10 minutes max. Try this, say 12 by 5 minutes and stack. I am not sure what your camera gain settings do so maybe someone else can help here and give you the best settings.
I have posted a Lagoon stack of 3 by 5 minute subs. On this night my scope was dripping with moisture and the guiding consequently was very bad. After 3 subs i gave up and went home coz i forgot my dew heater. So this image suffers from bad guiding, not enough data and a wet dewey lens.
Anyway good luck
Paul
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