Generic 1mm Macro Ultra-slim M42 to NEX Adapter For 17-31mm Extension Tube Solid metal mount lens adapter allows classic M42 lens (eg:Pentax Takumar, Zeiss, Maimiya etc) to be used on Sony E-Mount camera body. Make M42 screw mount Lens can be used on Nex E mount systerm cameras There is no ROM connection on the ring so diaphragm control of the lens is set manually It is possible to use macro rings and other accessories It can focusing infinite