<ul> <li>Front side - M52x1 female thread</li> <li>Rear side - Arri PL mount plus M52x0.75 female thread.</li> <li>Distance between flanges - 9 mm.</li> <li>Weight - 19 g.</li> <li>Made of high quality aluminium alloy.</li> </ul> <p>This adapter allows using Chinese focusing helicoids with M52x1 mount thread on cameras with Arri PL mount.</p> <p>Useful for non-standard lens and bare optical block adaptations.</p> <p>Rear part has female M52x0.75 thread, so you can install some filter if it clears your camera interior.</p>