AF-S NIKKOR 180-400mm f/4E TC1.4 FL ED VR has an upgraded optical design for maximum effectiveness. It comes with a Built-In 1.4x Teleconverter, One Fluorite and Eight ED Elements, Aperture Range of f/4 to f/32, Nano Crystal & Super Integrated Coatings, Fluorine Coated Front Lens Element, Silent Wave Motor and Internal Focusing, Vibration Reduction, Sport/Tripod Modes, Electromagnetic Diaphragm Mechanism, just to mention but a few. It is created for FX image sensors with a focal length range of 180 to 400 millimeters, and you can also use it with DX sensors at an equivalent focal length range of 270 to 600 millimeters. This lens comes with an in-built 1.4x teleconverter making it possible for you to reach a focal length range of 252 to 560 millimeters or 378 to 840 millimeters with DX cameras. You only need to flip the right-hand switch, and you are good to go. Our Take on the AF-S NIKKOR 180-400mm f/4E TC1.4 FL ED VR: The constant f/4 maximum aperture of this lens is a plus, hence you can experience constant illumination all-through the zoom range when the teleconverter is not in position. When you engage the 1.4x teleconverter, the maximum aperture stands at f/5.6. With one fluorite element as well as eight extra-low dispersion glass elements in its optical design, you can be confident of flawless reduction of chromatic aberrations and color fringing to guarantee color precision and clarity. There is a focus range limiter that ensures the constriction of focus mechanisms to a 19.7' to infinity range so that there can be swift focusing effectiveness. Its elements come with Nano Crystal Coat as well as Super Integrated Coating to reduce surface and interior reflections. This helps in lowering lens flare as well as ghosting to achieve high-fidelity pictures. You will like its Vibration Reduction image stabilization that helps in reducing the effect of camera shake for a maximum of four shutter speed stops