Tubo de montaje macro adaptador helicoide de enfoque ajustable de latón M42 a M39 12 mm-19 mm
This focusing Helicoid tube is made with standard M42 mount and M39 Mount. This adapter made with Copper core, high quality and stable. Firstly attach your M42 lens to this tube. The length of this Helicoid tube 12mm (min) to 19mm (max).