<ul> <li>Front side - 52.5mm inner diameter</li> <li>Rear side - M49x0.75 male thread</li> <li>Weight - 37 g</li> </ul> <p>This adapter allows using projection attachments that have 52.5 mm barrel diameter on lenses with M49x0.75 filter thread.</p> <p>Known compatible attachments are:</p> <ul> <li>ISCO Ultrastar Studio 80mm</li> </ul> <p>The adapter is secured by screws. Intermediate flat spring protects a lens body from damage by the screws.</p> <p>Made of light alloy, anodized to black color and laser engraved.</p>