There's something magical about an open field of untracked snow. It beckons you, and before you know it you're howling in delight as the powder lightly glides over your head and shoulders. When you come to a stop, you proudly turn back to see your tracks-the first to be etched in this pristine setting you worked so hard to find. Ski photographers make it a habit to hunt down such places. Here's what they have to say about their good fortune.