Before revision: upright=1.0|A KH-9 image of a Russian airfield The main camera system was designed by Perkin-Elmer to take stereo images,Doyle, John M., Big Bird, uncaged, Air & Space, December 2011/January 2012, p.10 with a forward looking camera on the port side, and an aft looking camera on the starboard side.
After revision: upright=1.0|A KH-9 image of the Soviet Kubinka airfield The main camera system was designed by Perkin-Elmer to take stereo images,Doyle, John M., Big Bird, uncaged, Air & Space, December 2011/January 2012, p.10 with a forward looking camera on the port side, and an aft looking camera on the starboard side.