Gene51 wrote:
https://iso.500px.com/northern-lights-photo-tutorial/
If you can beg, borrow or steal a 11mm lens that offers an F2.8 max aperture or one that zooms to 11 mm, you'll be glad you did. Tokina has two zooms 11-16 and 11-20, both are F2.8.
Thanks for the URL recommendation.