<ul> <li>Front side - 67mm inner diameter</li> <li>Rear side - M65x1 male thread</li> <li>Weight - 85 g</li> </ul> <p>This adapter allows using projection lenses that have 67mm barrel diameter (like for Buhl f/2.5 7-inch lens) 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 of M5 screws. Intermediate flat spring prevents a lens barrel damage.</p> <p>Made of anodized light alloy.</p> <p> </p>