I'm listing an M42 screw mount lens, even though I've selected the Pentax K mount. Please make sure there's no mistake. Thank you for looking. This is a listing for a Super-Multi-Coated TAKUMAR 1:1.8/55mm lens. ● Optics There is some dust and dirt, but overall it's clean and has good light transmission. I don't feel it affects the image quality. ● Function The focusing ring, aperture ring, aperture blades, and A-M switch all work without any problems. ● Appearance There are some minor scratches and dirt from use. Please check the photos. The listing includes the lens body, the original front cap, the original plastic hood, and the hood case. This is an old, used item from about half a century ago. Please consider this before purchasing. #sunacamera