Celestron - 20mm Omni Series Eyepiece 1-1/4 inch

If you are looking to move up to a higher quality eyepiece the Omni series
provides more enhanced features in a wider selection of focal lengths.
Celestron designed this series with the finer points in mind so you, the
user, can benefit from the features that make this series unique. The Omni is
a 4 -element premium symmetrical Plössl optical design. Features include
blackened lens edges to minimize internal reflection and maximize contrast,
multi-layer coating group on each lens surface to maximize light transmission
and contrast, and each Omni goes through a two-step anodizing process to
prevent reflection from the top eyepiece barrel, unlike most other
manufactures who use reflective surfaces. Threaded barrels accept 1-1/4”
Celestron thread-in filters.

The 20mm medium power Omni eyepiece is a 4 -element premium symmetrical Plössl optical
design. Features include blackened lens edges to minimize internal reflection and maximize
contrast, multi-layer coating group on each lens surface to maximize light
transmission and contrast, and each Omni goes through a two-step anodizing process to prevent
reflection from the top eyepiece barrel, unlike most other manufactures who use reflective
surfaces. 
Threaded barrels accept 1-1/4" Celestron thread-in filters.