The Pentax SMC 55mm F1.8 MF K-mount lens S#1307209 is a high-quality lens that is perfect for photography enthusiasts. Its smooth manual focus and precise aperture detents make it easy and enjoyable to use. The lens is very sharp when stopped down and can produce stunning results even when used wide open at F1.8. With a closest focus of 450mm, this lens is perfect for close-up shots. Whether you're using black & white film or a digital camera, the SMC 55mm F1.8 produces beautiful colors and exceptional image quality. You can use this lens with your K-mount film Pentax or add a K&F precision PK - E mount adapter for even more versatility.