In the spring of 1916, a 14-year-old San Franciscan was taken to see Yosemite National Park. There he was presented with a simple box camera. It was an epochal gift: over the next 68 years Ansel Adams was to become America's best-known photographer and a major champion of its imperiled wilderness. Even now, when every stump in creation has been subjected to a portrait sitting, his pictures retain the power to startle.
Until his death in 1984, Adams was photography's mountain man. He has even made a posthumous climb: Adams' autobiography is probably the most expensive book ever to scale the...