G'day Bo, your image is really quite good, nice detail and the star colours are there. The LP is obviously a problem in your area as you said. There is a tutorial for photoshop that shows you how to remove the gradient. It doesn't do a perfect job but it will help a lot. I will find it and post a link tonight. A LP filter will help immensely, so I think your next try will have a much easier gradient to remove. Also try using a lower ISO if you can, it just makes it so much easier to process. I use eaither ISO 1600, or if I can I use ISO 800. Hope that helps.
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