From the press release:
Poetics of Light: Pinhole Photography
New Mexico History Museum
Trinity Site Atomic Bomb Test, 1945, copy print. When the atomic bomb test was conducted at the Trinity Site in New Mexico, Julian Mack, working for the Los Alamos National Laboratories, documented the explosion with a pinhole camera.
Note: Representative image at left is often cropped for display purposes. Downloaded high-resolution images are not cropped.