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Marc, 30 sec unguided should be OK as long as you have a short focal length set. 50mm seems to be the longest that will keep it all in frame, and that's getting to be about to limit for 30 sec unguided. Beyond that a barn door would be sensible.
I have an 11-16mm f/2.8 and 16mm at 30 sec plus judicious cropping should work. The next lens up is only f/3.5
The view over the pool and the house, through the trees is in the right direction. At 23:00 the sky was almost clear. Set the alarm for 03:00 this morning, and it was pouring. Typical.
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