FED-STD-H28/18A, FEDERAL STANDARDS: SCREW-THREAD STANDARDS FOR FEDERAL SERVICES - SECTION 18 - PHOTOGRAPHIC EQUIPMENT THREADS (10 MAY 1995)
FED-STD-H28/18A, FEDERAL STANDARDS: SCREW-THREAD STANDARDS FOR FEDERAL SERVICES - SECTION 18 - PHOTOGRAPHIC EQUIPMENT THREADS (10 MAY 1995)., This section describes the screw threads commonly used on photographic equipment in order to promote interchangeable connections.