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Good advice has been given here. Lower the ISO, expose to 1/3rd histogram, use a light pollution filter, Hutech one comes up as being most popular. Narrowband and CCD is another option. Lots of shorter exposures stacked. 30 seconds sounds too short though.
Allen (Allan?) Gould shoots in Brisbane light pollution and gets great results. I suggest you check out his site and setup as he constantly surprises me with his results from where he shoots.
Greg.
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