The Nikon TC-14A is a teleconverter that increases the focal length of a compatible Nikon lens by a factor of 1.4. For example, a 200mm lens becomes a 280mm telephoto lens without the need for an additional lens. The converter reduces the available light by one stop and is designed for use with specific Nikon lenses. A compact and practical solution for photographers looking to extend their telephoto reach. Serial number 188324.