"Meade Series 5000 25mm HD-60 6-Element Eyepiece offers a large 60deg. apparent field of view and a flat field of view which is tack sharp right to the edge. This design provides more than 17mm of eye relief for terrific viewing comfort while simultaneously delivering a 40% improvement in corrections for chromatic aberration and edge distortions over traditional Plossls. You simply won't believe how much a premium eyepiece can improve your view, no matter what telescope you own.Meade Series 5000 Plossl Eyepieces offer a very wide field-of-view, with pinpoint edge of field sharpness and contrast. Specifications of this advanced design include a six element, super fully multi-coated optical design with premium-grade and exotic optical glass for the best possible performance and image brightness and blackened lens edges for enhanced contrast.Features a precision manufactured 1.25"" barrel, increased eye relief and an adjustable twist-up rubber eyeguard for comfort and blocking stray light."