The Orion Expanse Eyepieces features 66° apparent field of view which helps in taking in objects like the Andromeda Galaxy, the Double Cluster, or the star clouds in Sagittarius in one sweep. Expanse oculars have big eye lenses and great eye relief (13mm to 17mm). Eyeglass wearers can view the entire field without removing their glasses.
All eyepiece elements are fully coated, with the outer lens multi-coated for additional light transmission. Each 1.25" aluminum barrel is threaded for filters and internally blackened to eliminate internal scattering. And their fold-down rubber eyeguards enhance contrast by blocking stray light.