Thank you for viewing. This is a Tokyo Kogaku Simlar 1:3.5 f=5cm L39 Leica screw mount lens. It is not a Pentax K mount. It can be used with digital cameras via a mount adapter, and focusing is manual. It comes with front and rear caps and a filter. There are some minor scratches on the front element, but no major scratches are visible on the lens barrel. The aperture and focus rings rotate smoothly. Please refrain from purchasing if you are sensitive to imperfections. This is an old item, and it is sold as-is. In the event of any oversight or issues after arrival, the buyer is responsible for handling them. We cannot cover repair costs or accept returns, so please purchase only if you agree to these terms. Thank you. Focal length...19-70mm Maximum aperture...2.9-4 Other features...Old lens, with front lens cap, with rear lens cap