Made of black anodized aluminum the KIWIFOTOS LMA-M42_EM lens mount adapter allows M42 (Zeiss, Pentax, Praktica, Mamiya and Zenit) lens to be used on any Sony E-Mount NEX camera body. Infinite focus is guarantee. There is no electronic communication between the M42 screw mount lens and the Sony E-mount camera body, auto focus will not be available, however. Use the lens in the fully manual exposure mode (M), or in the aperture priority (A) mode and use MF assist function to pick 7x or 14x magnification to focus accurately.