Here’s the tip: If you take the time, effort, and money to travel to Northern Norway to see the Northern Lights, take the UV filter off before you leave the hotel. I was using a nice travel medium format camera, the Fuji GS645S and Portra 400 film (pushed one stop), but neglected to take the filter off.
Here is the camera:
And here is one of the results. This was about a 30 second exposure. You can see refraction rings in the center of the photograph.
It doesn’t ruin the picture completely, but I’d rather it not be there. No worries though, I also got some good digital pics of the aurora like the one below (Olympus EPL-1).