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Great capture! So in doing something like this, have you pieced together two different shots, one forground and one sky? I've never used a star tracking device, but if you were tracking stars for time exposure (for their movement), then I'm assuming you have to do another exposure of the forground elements without star tracking so they aren't blurred. Is this the technique here, two exposures blended together in post?
Yes, that's the way I did it. The first is a twilight / moonlight shot, then the stars from the same angle later on.