Celestron XCel ED eyepieces

Each air-to-glass surface is fully five-layer multicoated for high light transmission. The lens edges are blackened to eliminate internal reflections and improve contrast. They are threaded for standard filters, have rubber grip rings and soft roll-down rubber eyecups, and come in durable plastic cases. The eyepieces are parfocal, reducing the amount of refocusing needed when switching from a low power to high power eyepiece. Optically, these eyepieces have little ghosting and respectably flat fields. Sharpness is good, as is contrast, and optical aberrations are mild. All in all, they are high performance eyepieces at bargain prices.