This is an 18 mm Series 5000 Ultra-High Definition (UHD) Eyepiece with a 1.25" barrel.
This Meade series of eyepieces offer a very wide field-of-view, with pinpoint edge-of-field sharpness. These advancements in Meade's Series 5000 Eyepieces feature a fully multi-coated optical design with premium-grade, exotic optical glass - for the best possible image correction in color and brightness.
Blackened lens edges provide enhanced contrast and help to reduce reflections while the parfocal design delivers little-to-no focus change when switching between eyepieces.
A generous eye relief, lets you enjoy a comfortable observing experience. UHD eyepieces deliver a 40% improvement in corrections for chromatic aberration and edge distortions over traditional Plössls.
A waterproof design, UHD eyepieces will guard against fog and outdoor atmospheric elements. Observe your favorite celestial objects in a new and improved view.