<ul> <li>Front side - smooth, 52.5 mm inner diameter</li> <li>Rear side - M77x0.75 male thread</li> <li>Weight - 55 g</li> </ul> <p>This adapter allows using projection attachments that have 52.5 mm barrel diameter on lenses with M77x0.75 filter thread.</p> <p>Known compatible attachments are:</p> <ul> <li>ISCO Ultrastar Studio 80mm</li> </ul> <p>The adapter is secured by 3 set screw (installed) with an allen key (included).</p> <p>Made of light alloy, anodized to black color and laser engraved.</p>