To create Star Trails you could do a long continuous exposure but you could find the highlights overexpose.
Photo Stacking is made by taking hundreds of photos and combining them to create one image.
I used an Olympus EM5 II to do this for me.
It simply takes multiple photos and combines them for you.
You could also use software to combine the separate images
I used the following settings:
Olympus - Live Comp
- ISO 100
- 10 seconds per frame each photo added to the next for 1 hour
- Aperture f/1.8
