National Geographic magazine photographer Joel Sartore shoots in some of the most exotic locales on earth, but often in wretched conditions for weeks on end. On the job, he's been chased by bears, wolves, alligators and musk oxen. Capturing the beauty of Sandhill cranes in Nebraska or the tropical Amazon jungle, Sartore pursues the perfect image -- photographs form the narrative for every National Geographic article. This documentary shows Sartore in consultation with National Geographic photo editors in Washington, DC, as thousands of individual frames are whittled down to the 10 or 20 that will accompany a typical magazine story.