Fine finish black anodized aluminium metal design with a brass silver ring the LMA-PK(A)_EM lens mount adapter allows PENTAX K lens to be used on SONY E-Mount NEX Camera such as NEX3/NEX5.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. The Focus can be infinity.