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Very nice shot. But hey its upside down! hehe
Yes the noise is from the short subs and total exposure time and in fact you did well to show NGC6559 so well with 70 minutes. Thanks for the FSQs F5 and the dark skies eh?
30 minutes is good in theory but harder in practice - tracking errors, polar alignment errors start to show and of course it makes you more vulnerable to cloud interruptions. So if you have good polar alignment and good tracking and no clouds then go for it.
Sometimes imaging parameters are something decided on the night based on the conditions you have. Especially when you travel to your site.
Its no good doing 20 minutes subs with cloud coming over every now and then for example. You'll end up with nothing.
Your second version is better except for the core of M8. You had better detail right to the core. The data is there.
So,
Lassoo the core and run either curves on it or shadows/highlights until the core detail is returned. You'll have to feather it 25 pixels and if you hit control H after you lassoo an area or select an area the lines that show the selection are hidden and it is easier to see the effect your processing is having.
Greg.
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