<ul> <li>Front side - M39x1 female thread</li> <li>Rear side - Leica R-mount</li> </ul> <p>Machined of high quality aluminium alloy.</p> <p>This adapter allows using lenses with M39x1 thread (compatible with Leica Thread Mount) on cameras with R-mount.</p> <p>Infinity focus is NOT provided. Main purpose of this adapter is assembling of macro setups.</p>