The Contax Carl Zeiss Sonnar T* 210mm F/4 Lens for 645 is a high-quality telephoto lens designed for Contax cameras. Made in Japan in the 1980s, this lens features a maximum aperture of f/4 and a focal length of 210mm, making it ideal for capturing detailed images with a shallow depth of field. With manual focus and a durable plastic exterior, this lens is a reliable and versatile option for photographers looking to expand their creative capabilities.