The second known example of the unique Apo-Elmarit-M 2.4/75mm lens. The other example, no.394-004 is shown in Lager II 'Lenses', page 230. The lens is a unique construction designed for maximum performance in a compact package. Most probably, it was developed by Ernst Leitz Canada in the 1970s to order from the U.S. Navy (like the more known Elcan 2/66mm). The offered example is in excellent condition, with very good, clean optics, it comes with a special hood.