The Vivitar Automatic Tele Converter 3X-1 is a high-quality lens accessory designed to zoom in on distant subjects with precision. Made in Japan, this teleconverter is part of the Vivitar Series 1, known for its reliability and excellent image quality. With a maximum aperture of f/2.8 and manual focus capabilities, this lens allows photographers to achieve sharp and detailed images with ease. The screw mount design ensures a secure fit on most camera lenses, making it a versatile and essential tool for any photography enthusiast.