Climbers photographed with a compact camera through the eyepiece of a telescope. The telescope magnified 27x.
The climbers were at about 1300 feet of El Capitan's 3,000+ foot rise above the valley floor. El Capitan was not climbed until 1958.
http://www.yosemiteclimbing.org/content/huge-fresno-bee-article-conquest-el-capitan