What is a key characteristic of Ansel Adams' photography style?

Ansel Adams is renowned for his mastery of black-and-white landscape photography, particularly in relation to the American West. A crucial aspect of his work involved meticulous attention to detail and the ability to capture the dramatic interplay of light and shadow in natural landscapes. While he did experiment with color later in his career, the hallmark of his style is firmly rooted in monochrome images that convey depth, texture, and the grandeur of nature.

The other options do not align with Adams' approach; he was predominantly focused on landscapes rather than limiting himself to nature photos exclusively, his work is celebrated for its stunning black-and-white imagery rather than color, and he is not known for abstract or portrait photography. Additionally, Adams predominantly used traditional film cameras and darkroom techniques rather than digital cameras, which characterizes a significant segment of photography prior to the digital era. This context elucidates why the option regarding his work in color is not the suitable choice in understanding his photographic style.