<ul> <li>Front side - 52.5mm inner diameter</li> <li>Rear side - M65x1 male thread</li> <li>Weight - 30 g</li> </ul> <p>This adapter allows using projection lenses that have 52.5 mm barrel diameter on Chinese focusing helicoids with M65x1 screw thread. Such setup is great for portrait and macro shots.</p> <p>The adapter is secured by 3 set screw (installed) with an allen key (included).</p> <p>Distinctive feature of this slim version is possibility to mount it in reverse direction if you need to put a lens bit deeper into helicoid.</p> <p>Made of light alloy, anodized to black color and laser engraved.</p> <p>For sale is the adapter only. The lens and helicoid are pictured for reference only.</p> <p> </p>