North American received a contract to modify six F-100As to RF-100As carrying five cameras, three Fairchild K-17 cameras (see Fairchild K-20 camera) in a trimetrogon mounting for photo-mapping and two Fairchild K-38 cameras in a split vertical mounting with the cameras mounted horizontally, shooting via a mirror angled at 45° to reduce the effects of airframe vibrations. All gun armament was removed and the cameras installed in the gun and ammunition bays covered by a bulged fairing under the forward fuselage.