The Kenko Tele-extender is a high-quality lens accessory designed for Nikon F-Ai lenses. It allows users to extend the focal length of their lenses, providing a telephoto effect for enhanced zoom capabilities. Additionally, the 13E Pro 55mm Close Up Filter is included, adding versatility to the system by enabling close-up photography with sharpness and clarity. This product is perfect for photographers looking to explore different perspectives and creative effects with their Nikon F-Ai lenses.