At a sum of US$ 2,064,500, Leica has the honor of manufacturing the world’s most expensive SLR Lens, the Leica APO-Telyt-R f/5.6 1600mm telephoto lens. A Howitzer among lenses, this 1600mm is also the largest and heaviest lens telephoto lens at 47.24 inches long, 16.5 inches diameter, and 132 lbs!