This was taken after about an hour's hike up to this lake at the base of Mount Fitz Roy in Argentina... the altitude can be difficult and you can get exhausted quickly. I set up at the side of this lake looking toward the mountain waiting for the morning light, but it was minimal and transient: lasted only about 30 seconds, but long enough for this image.
Canon 5D Mark II
Canon 24-105mm f4 L lens at 58mm
settings: f22 ISO 100 for 30 sec
Gitzo tripod, reallyrightstuff ballhead