Fine finished made of black anodized aluminium the LMA-M42_NK(o) adaptor permits the user to use M42 universal screw mount lenses (from Zeiss, Pentax, Praktica, Mamiya and Zenit) and macro accessories on NIKON camera (35mm and DSLRs). The mount adapter is built with multi-coated optical glass. The lens fits physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly. Use the lens in the fully manual exposure mode (M) or set your camera to Aperture Priority (AV) mode to use the camera in auto exposure. Focus to infinity is available.