After optimized design, the XWA13mm eyepiece is specially optimized for binocular use, with 1.25-inch /2-inch dual interfaces. The maximum length of the eyepiece is 62.5 mm, which can meet the needs of most double pupil distances. The exit pupil distance is as long as 13 mm, which makes observation comfortable and makes it easier to find eye points. On most telescopes, XWA13 can provide sharp imaging from middle to edge. XWA13 is equipped with foldable eye mask and M44.5x0.75 thread, which makes it easy to connect with other accessories.