The Nikon AF-S NIKKOR 800mm f/5.6E FL ED VR Lens is a telephoto lens that is compatible with both FX and DX-sized image sensors. This lens features a rugged magnesium alloy barrel construction that provides durability and strength that are suitable for its use with wildlife, nature, and sports shooting applications. The lens construction integrates two fluorite lens elements to help reduce the overall weight of the lens while also offering chromatic aberration-reduction benefits. Also aiding in the reduction of chromatic aberration is the inclusion of two ED (extra-low dispersion) elements that furthermore provide an increase in image sharpness, clarity, and color fidelity. A Nano Crystal Coat is applied to lens elements to minimize surface and internal reflections and ghosting for greater image clarity and contrast. Built-in Vibration Reduction image stabilization helps to lessen the appearance of blur caused by camera shake by up to four shutter speed stops, which greatly benefits this lens' use in low-light conditions and fast-paced photography. Additionally, an electromagnetic aperture mechanism is integrated into the lens design to provide greater exposure control stability that is especially beneficial when working with faster continuous shooting rates. The AF-S Teleconverter TC800-1.25E ED is included with the lens to further extend the effective focal length to 1000mm f/7.1. This teleconverter incorporates an ED element into its design to maintain the high image quality achieved by the lens alone. Additionally, the electromagnetic aperture control is fully supported when the teleconverter is in use.