Played with doing image composite star trails this weekend, this one turned out! Would love to do it again some time when I have the whole night to experiment.
Bright mode, 10 second exposures, I think this was 1 hour total. Brightened slightly in Rawtherapee.
I forgot to bring my K3 at the end of this, fell asleep (it was midnight!) Woke in the morning, it was covered in dew. Very thankful for the WR, wiped it off and it seems fine.
I'd like to redo this image with a wider lens - this was at 18mm with the 18-135 DA WR lens. On the other hand, this is the only WR lens I have, glad it was on there.