Ansel Adams, Saint Francis Church Ranchos de Taos, New Mexico, c. 1929 Gelatin silver print, 13 5/16 x 17 9/16 inches Collection Center for Creative Photography, University of Arizona © The Ansel Adams Publishing Rights Trust Georgia O’Keeffe and Ansel Adams: Natural Affinities, which opened at the Smithsonian American Art Museum last week, shows that works of art can indeed converse with each other. With photographs by Adams and paintings by O’Keeffe, Natural Affinities…