1.25inch ensures compatibility with wide of telescopes, making it to astronomical equipment collection the vastness of 20mm Wide Angled Eyepiece, featuring generous field of view for expansive stargazings for Astronomys enthusiasts, bird watchers, as well as students and researcher Precisions in celestials observation for use at observatories, nature reserves, or during outdoor expeditions, this eyepiece brings the universes to you with right side up optics and antireflective coating, this eyepiece delivers clear observations with Enhances light transmission