The radio operator and flight engineer sat in the first cabin aft of and below the flightdeck. The mission equipment was located further aft, in a cabin featuring five camera windows in the floor. Each camera window could be closed with covers to protect the glass panels. The covers were located in special fairings protruding from the fuselage underside. In the normal aerial photography role, four or five cameras were carried aboard. Three cameras were mounted vertically, intended for mapping purposes. The remaining two cameras were pointed at an angle of 28° on each side of the aircraft, for oblique photography. The same fuselage compartment contained workstations for two camera operators and a crew rest area.