If you're looking for a higher quality eyepiece than the standard-issue offering that come with most telescopes, the 4.0mm Omni provides more enhanced features at a great value. Celestron designed the 4.0mm Omni with attention to the details that separate good eyepieces from average ones. It is a 4-element Plossl formula with blackened lens edges, multilayer coatings upon each surface and an anodized barrel. These features combine to increase contrast and light transmission, and of course it is threaded to accept Celestron's many 1.25" eyepiece filters.
Omni 4mm Eyepiece (1.25")
Front & Rear Lenscaps