Camera settings
ISO: Start at 1600-3200. Lower if aurora is bright (800-1600) or higher if faint (3200-6400). Many modern cameras handle 6400 well.
Aperture: Wide open (often somewhere between f/1.4 and f/2.8 depending on your lens). Don't go narrower than f/4.
Shutter Speed: 5-15 seconds. 5-8 seconds for bright auroras or 10-15 seconds for more faint northern lights. Longer = more blur in aurora movement.
Tripod: Use a tripod if possible. It's a good idea to turn off Optical Image Stabilization (OIS) to limit compensating micro-movements when using a tripod. If you dont have one, lean the camera or your body against something stable and leave OIS on.
Lens choice: Wide angle (14-24mm) for full sky drama. Standard (35-50mm) for aurora details
Focus: Manual focus on infinity or use the moon or bright stars to get focus.
Filters: Consider a light pollution filter near cities.
Photo: Sven Erik Knoff, Visit Norway