Bootes and Corona Borealis. After 20 minutes of exposure, the lens is covered for 45 seconds, and then opened for 15 seconds, followed by another 45 seconds cover and finally 20 minutes more exposure. Olympus OM-1, 50mm lens at f1.8. Kodak Max 400 film. 40 minutes exposure with a tripod, 2000/4/30 1:11 EDT Greene County, Pittsburgh.