Ultra Telephoto 50-1000mm (75-1500mm with Built-In 1.5x Extender). The CINE-SERVO 50-1000mm T5.0-8.9 ultra-telephoto zoom lens delivers the long focal length performance demanded by today's users of single-sensor large-format cameras for broadcast sports, nature cinematography, and digital filmmaking. With the world's longest focal length (75-1500mm with its built-in 1.5x extender) and highest (20x) magnification among super 35mm zoom lenses as of August 31, 2014, the CINE-SERVO 50-1000mm T5.0-8.9 ultra-telephoto zoom lens offers new creative opportunities possibilities for today's growing community of 4K, UHD, and HD image makers.