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Mine were 30 second eposures on ISO 3200. Yes they were on wide angle, but then again 28mm isn't really wide lol.
I like the framing of yours more.
In hindsight, I should have done a shorter exposure (20sec) and ISO 1600 would have sufficed.
I'll remember this the next time I'm in a good location (and moonless, clear night) for these type of shots again.