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Approximately 45 minutes (2,384 seconds) in an ice cold arroyo near the Sea of Cortez. ISO 640 (probably a bit too high, tonight I’ll shoot at ISO 400) f/4 through a Canon EF 28mm f/1.8 USM (recently returned from some WARRANTY work by Canon) on a Canon 5D MkII. I got several other test shots to try to center Polaris but this was the longest exposure by far. I’m pretty pleased with it but I think an hour exposure at a lower ISO will give me better results. The plan is to head out in to the desert southwest of town and shoot in the saguaros. Should be fun.