The document discusses the photographer Ansel Adams, known for his black and white nature photographs. It provides biographical details of Adams, born in 1902 in San Francisco and active until his death in 1984. It also describes one of Adams' photos titled "Half Dome and Merced River", taken in Yosemite National Park in 1938, which features the Half Dome mountain and Merced River from a low angle composition to make the landscape the main subject.