Made of black anodized aluminum (camera body mount) and brass silver (lens mount) the KIWIFOTOS LMA-M39_EM lens mount adapter allows the use of Leica Thread Mount M39 (LTM) lens on the Sony E-Mount NEX Camera Body. With the adapter your Sony NEX camera will no longer limit to one lens but a variety of Leica M39 lenses for great picture quality and more fun. The lens will fit physically, auto-focusing control and camera modes which control exposure by automatically adjusting aperture are not retained, however. Infinite focus is guarantee. Use the lens in the fully manual exposure mode (M), or in the aperture priority (A) mode and select MF assist function to focus accurately (7x or 14x zoom focus).