To satisfy current reconnaissance trends, high resolution, small format cameras are becoming more necessary.. The KS-121A Camera System is representative of this trend. Developed to improve the reconnaissance capabilities of the RF-5 aircraft, the KS-121A 70-mm Frame Camera. System offers high resolution in a small format. The small size permits the mounting of four cameras in the aircraft nose which may be configured to suit a variety of missions. The camera features interchangeable lenses of three focal lengths, a wide range of shutter speeds, automatic control, of both shutter speed and lens relative aperture, vacuum film flattening, and built-in-test.
O. J. Smith, O. J. Smith,
"KS-121A CAMERA SYSTEM FOR THE FR-5A/E AIRCRAFT", Proc. SPIE 0058, Effective Utilization and Application of Small Format Camera Systems, (1 September 1975); doi: 10.1117/12.954323; https://doi.org/10.1117/12.954323