This Tamron Adaptall 2 lens with Pentax KM adapter ring is perfect for photography enthusiasts who are looking for a reliable and versatile zoom lens. With a maximum aperture of F/3.6-4 and a focal length range of 80-210mm, this lens is compatible with both Tamron and Pentax brands. Its manual focus type and a compatible lens front of 58mm make it easy to use, while its 9-inch length and country of origin, Japan, make it a quality product.