Yellowstone’s Castle Geyser generates dramatic 40-minute eruptions that shoot water and steam 70 feet into the air. Unfortunately, eruption intervals occur about 12 hours apart, so you don’t get many opportunities to photograph this impressive geyser. Castle is a predictable geyser, but the prediction window is plus or minus 2 hours. If Castle Geyser is predicted to erupt at midnight, it could be any time between 10:00 pm and 2:00 am. Castle is worth waiting for! The green in the sky is not the northern lights. It is a phenomenon called airglow. Nikon D4, Nikon 14–24mm f/2.8 lens, ISO 3200, f/2.8, 20 seconds, 3700K WB, manual exposure and ...

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