No, there's a not-high-tech-at-all piece of bent metal that "secures" the adaptor to the lens. But despite that desription, it works and works well. I bought this one (a) partly because it was the one that Tim was selling here, and (b) because at the time, it was for use on film cameras, and I had/have quite a few Zeiss C/Y lenses from 25mm to 180mm. On ny APS-C sensor, though, I only tend to use the 50mm and 85mm f1.4 Planars, so that's less of a reason - until I get a full-frame sensor.