<p>This adapter provides 80mm outer diameter for matte box coupling.</p> <p>It has also front 77mm (M77x0.75) thread to allow using wide range of standard filters.</p> <p>Can be used on lenses with M85x1 filter thread.</p> <p>Known lenses with OCT-19 mount in Konvas housing that fit are:</p> <ul> <li>OKS7-28-1</li> <li>OKS8-35-1</li> <li>OKS1-50-1</li> <li>OKS6-75-1</li> </ul> <p>But take care and measure your particular lens filter thread since some of the same model lenses have different filter threads.</p> <p>Made of anodized aluminium.</p> <p>Front 80mm plastic cap is included.</p> <p> </p>