FMC optical glass Bring you a clearer, sharper and true vision Internally blackened internally blackened eyepiece barrel to eliminate light scatter and provide a crisp image SVBONY 68-degree ultra-wide-angle 6mm eyepiece has a comfortable and wide field of view, suitable for planetary observation; the 68-degree ultra-wide-angle field of view allows for a broad view of the moon, star clusters, and the Milky Way. The observed image is brighter without introducing additional chromatic aberration, making the image clearer The 1.25-inch lens barrel is equipped with m26.5*0.6 standard internal thread, which can accommodate standard 1.25-inch filter lenses The eyepiece lens edges are treated with black to reduce the scattering of stray light and improve image contrast The lens barrel is internally threaded for diffusing and coated in matte black to reduce internal reflections and provide clear images