The Kiwi Lens Mount Adapter - A-NX allows PENTAX K lens to be used on Samsung NX-Mount cameras. * This unique adapter is equipped with a "ON/OFF" aperture control ring for user to set the designed aperture. * It is manual and does not provide auto-focusing and auto-diaphragm therefore, use the lens in the fully manual exposure mode (M), or in the aperture priority (A) mode. * Focus can be infinity.