"Aurora I"
Aurora Borealis
Late summer/late 1970s from Turnagain Arm, Alaska 2 minute time exposure -- 55mm f/2 on Kodak ASA 400 color negative film. Both this and "Aurora II" were exposed off a standard tripod in a deserted campground in Alaska while a grizzly bear fished (at night, of course) in a nearby stream (we could hear him splashing, growling, etc.) This sort of photography can obviously have non-optical challenges!

Click the image for a larger version.