The Contax Carl Zeiss Sonnar T* 210mm F/4 Telephoto Lens is a high-quality lens designed for Contax cameras. With a maximum aperture of f/4, this lens is ideal for capturing detailed, sharp images with a shallow depth of field. The lens filter included in the bundle ensures additional protection and customization options. Made with plastic exterior material, this lens is durable and lightweight for easy use. The focal length of 210mm allows for versatile shooting capabilities, while the auto focus feature makes capturing images convenient for photographers of all skill levels. Overall, this lens is a reliable choice for photographers looking to expand their creative capabilities.