<ul> <li>Front side - M30x0.75 female thread</li> <li>Rear side - M42x1 male thread (universal mount for Zenit/Praktica)</li> <li>Max. diameter - 48 mm</li> <li>Distance between flanges - 5mm</li> <li>Weight - 20 g</li> </ul> <p>This adapter allows using some L Plan microscope objectives with M30x0.75 mount on M42 cameras or extension tubes/bellows.</p> <p>Another application is optical block of LOMO OKS8-35-1 lens - you can use this adapter to mount it onto a focusing helicoid.</p> <p>Made of anodized aluminium.</p>