Celestron - 5mm Ultima Series Eyepiece 1-1/4 inch

Rated as best in their class by Sky and Telescope magazine, the Ultima eyepieces use a 5-element hybrid optical design. They feature long eye relief and a wide field, and each air-to-glass surface is fully multicoated to enhance contrast levels. These special eyepieces are computer designed to keep visual aberrations to an absolute minimum. They virtually eliminate the following aberrations: spherical, color, field curvature, coma, astigmatism, distortion and spherical distortion of the exit pupil. The inside surfaces and edges of all lenses are blackened, to keep out reflected light. Outside surfaces are flat black, with rubber grips for secure handling. Rubber eyecups are included both for comfortable use and to keep out extraneous light. Threaded barrels accept Celestron 1-1/4" thread-in filters. Lens and barrel caps are included for safe storage.