<ul> <li>Front side - 43.5mm dovetail</li> <li>Rear side - M49x0.75 male thread</li> </ul> <p>This adapter allows using a camera (film or digital) with a microscope to take hi-res pictures of micro world.</p> <p>Dovetail part is made up to Zeiss West standard (43.5mm).</p> <p>There is also inner M39x1 thread. It reduces light reflections and allows to use some other accessories if necessary.</p>