The Vivitar 70-210mm 4.5 -5.6 55 mm Lens is a telephoto zoom lens designed for Pentax cameras. With a focal length range of 70-210mm, this lens is ideal for capturing a variety of subjects with precision and clarity. It comes in a 55mm mount size and includes a case for convenient storage and transportation. While the lens is untested, it holds the potential to provide high-quality images and versatility for Pentax camera users looking to expand their lens collection.