A very comprehensive article indeed. Extensive and just about correct all around, but I do absolutely recommend not to set your lens to infinity without rigorous testing to see if it turns out sharp. With a big aperture, as you definitely need when shooting northern lights, the margin is very narrow. You will most likely get pictures which are slightly out of focus. And you won't see that until you get back home and view them on a bigger screen. Annoying...
I've been shooting auroras in Tromsoe for many years as this is my home. Yes, lucky me:). And I can also say that you only have to drive for about 20 minutes to be in complete darkness - without any light pollution of any kind. Open water all around with great reflections as the ocean and the fjords never freeze up. This region is excellent for northern lights shooting. Let me know if any of you are planning a trip to Tromsoe.
Shots can be viewed at my website www.kodiak.no. Just to get a taste of it
Anyway - great article!!