The Vivitar Auto Telephoto 400mm 1:5.6 lens is a high-quality telephoto lens designed for Nikon cameras. It features a maximum aperture of 1:5.6 and a focal length of 400mm, making it ideal for capturing distant subjects with precision. This lens is equipped with an auto focus feature, allowing users to easily and accurately focus on their desired subjects. Constructed with durable aluminum material, this lens is built to last and provide consistent, reliable performance for photographers.