White House, Canyon de Chelly

1939–1942

The Zone System, with Fred Archer

While teaching at the Art Center School in Los Angeles, Adams and the portrait photographer Fred Archer develop the Zone System — a calibrated scale of brightness, based on sensitometry, from Zone 0 (black) to Zone X (white) that lets the photographer determine in advance how the film must be exposed, developed and printed. The date is given variously as around 1939–1940 or as 1942.

1940

Helps establish MoMA's photography department

In 1940, together with the trustee David H. McAlpin and the curator Beaumont Newhall, Adams helps establish a photography department at the Museum of Modern Art in New York — the first at a major American art museum — acting as McAlpin's and Newhall's chief advisor. On December 31, 1940 the department opens with the exhibition “Sixty Photographs: A Survey of Camera Esthetics,” which took aesthetic quality as its guiding principle.

1940

“A Pageant of Photography”: the largest photography show in the West

In 1940 Adams creates “A Pageant of Photography,” the largest and most important photography show in the West to date, attended by millions of visitors.

1940

Kings Canyon becomes a national park

In 1940 Congress designates Kings Canyon a national park — the result of the Sierra Club's campaign, in which Adams's book and his testimony before Congress played a vital role.

1941–1942

The Mural Project for the Department of the Interior

In 1941 Adams contracts with the National Park Service for 180 days to photograph the national parks, Indian reservations and other lands under the department's management, for mural-sized prints to decorate its new building; he sets off on a road trip with his friend Cedric and his son Michael, combining the work with commissions for the U.S. Potash Company and Standard Oil. The project ends on June 30, 1942, and because of the war the murals are never made: Adams sends the department 225 small prints but keeps the 229 negatives.

1943–1944

“Moonrise”: first publication and first exhibition

“Moonrise, Hernandez, New Mexico” is first published in the U.S. Camera 1943 annual, chosen by the magazine's “photo judge,” Edward Steichen, so the picture finds an audience before its first formal exhibition at the Museum of Modern Art in 1944. Over the next nearly forty years Adams re-interprets it, making more than 1,369 unique prints.