Umm, that was taken as a load of 30" exposures. Stuck it on f8 i think, focus to infinity.
Using a remote just put it onto hold and let the camera take photos for a couple of hours. Stack them using startrails software or photoshop.
Light the foreground using torches/flashes
In that star trails pic the camera overheated i think and so stopped, hence the gaps
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)