<ul> <li>Front side - M52x0.75 female thread</li> <li>Rear side - M32x0.5 male thread</li> <li>Max. diameter - 55 mm</li> <li>Thickness - 4 mm</li> <li>Weight - 9 g</li> </ul> <p>This adapter allows using 52mm screw-in filters on Kern Switar lenses with M32x0.5 filter thread.</p> <p>Known compatible lenses:</p> <ul> <li>Kern Switar 25mm f1.5</li> <li>Kern Switar 75mm f2.8</li> <li>Kern Switar 100mm f3.3</li> </ul> <p><b>WARNING:</b>Though M32x0.5 is quite common filter thread for these lenses, some variations may have different thread size. Please measure your particular lens before purchasing this adapter.</p>