This is a helicoid adapter from Hanzatech for using Leica M lenses on Sony E-mount bodies. I am selling it because I am switching equipment. LM-E Leica M to Sony E ◎ Leica M-mount lenses have a short minimum focusing distance, but by using this helicoid adapter, you can get closer to your subject and take larger photos. ◎ For example, you can "take a photo of the coffee on the table while sitting in a coffee shop" or "take a photo of your friend at the next table." ◎ I was also able to use the helicoid to take photos at infinity with minor lenses that are difficult to find mount adapters for.