This illustration of a U.S. Air Force McDonnell RF-101C <i>Voodoo</i> camera configuration has four Chicago Aerial Industries KA-45 otical cameras with various lenses -- one pointed forward, one pointed straight down, and two angled to the side (called oblique).
AFM 55-6: Operations - Tactical Air Reconnaissance, 5 August 1964.  Department of the Air Force.  Page 4-23, Figure 4-29: Camera Equipment Tri-Camera Station.
<a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/photos/index.asp">National Museum of the U.S. Air Force</a> photo <a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/shared/media/photodb/photos/2014%5C01%5C140114-F-DW547-002.jpg">140114-F-DW547-002</a>