Key Features: Significantly smaller and lighter with the adoption of a Phase Fresnel (PF) lens element Designed with consideration to a dust and drip-resistant structure, and adoption of Nikon's fluorine coat that effectively repels dust, water droplets, grease, and dirt Cutting-edge optics with which one PF lens element and three ED glass elements have been adopted for extremely sharp and detailed rendering that is compatible with high pixel-count digital cameras Optical performance that is in no way sacrificed when the TC-14E III AF-S teleconverter is used Materials used in the new PF lens element effectively control PF (diffraction) flare The effective ghost and flare suppression achieved through the use of Nano Crystal Coat enables clear images AF speed increased by making lens elements in the focusing group lighter