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Yes I forgot you have light pollution to contend with. There is a difference in exposure strategy between light polluted areas and dark sky areas. Basically you can do practically as long as you like at dark skies. But in light polluted areas sky glow becomes a problem at some point.
Using those gradient removal techniques at AAIC is a key processing skill for light polluted images. Ultimately narrowband is the go if light pollution is too bad.
Greg.
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