This document describes a 2X auto focus 7 element teleconverter lens for Nikon cameras that doubles the focal length of attached lenses. It has a lifetime guarantee and is compatible with many Nikon, Sigma, and Tamron lenses. The teleconverter contains 7 lens elements, comes with caps and a case, and allows auto focus when used with lenses like the Nikon 70-200mm and third party 70-500mm lenses.