RUBIMAT AUTO 2.8/35mm. It is not a Pentax K mount. It can be used with digital cameras via a mount adapter, and focusing is manual. Includes front and rear caps, and a filter. No major scratches are visible on the lens barrel, front element, or rear element to the naked eye. The aperture and focus rings rotate with appropriate torque. Please refrain from purchasing if you are overly concerned about condition. This is an old item, and will be 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. SN: C65801 43000→39000→33000→29000→27000→25000→21000→19000→17000→15000→13000→11000→9900→9700→9500→9300→9100→8900→8700→8500→7900→7700→7500 Other features... With front lens cap, with rear lens cap Other features... Old lens, with front lens cap, with rear lens cap