Yeah I think you're being hard on yourself there, Martin
Just under 4 hours on a dim galaxy with 60 second subs from the most light polluted spot in Australia, well noise is always going to be an issue that would be difficult for anyone to overcome.
Plus, after a hot day (Friday was pretty warm!) many roofs radiate heat into the air at night, making shooting conditions even worse. All of that adds up, so you did really well.
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