Made of black anodized aluminium (camera body mount) and brass silver (lens mount) the KIWIFOTOS LMA-C/Y_EM lens mount adapter allows the use of Yashica/Contax lens on the Sony E-Mount NEX Camera Body (NEX3/NEX5 etc.). 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. Select MF assist function to focus accurately (7x or 14x zoom focus). It is also available to Infinite focus. Note: Shoot without lens function must be turned on.