The Ricoh XR Rikenon 50mm f2 L Early Tomioka Lens is a manual focus standard lens designed for Pentax K-mount cameras. Manufactured in the 1980s in Japan, this lens has a maximum aperture of f/2.0 and a focal length of 50mm, making it ideal for portrait photography. The lens is compatible with Ricoh and Pentax cameras, has a plastic exterior, and comes with a 1-month manufacturer warranty. With a 52mm front lens and filter size, this high-quality lens is a reliable choice for photographers looking for a versatile and well-crafted lens for their camera system.