Lwang 1.25" 12.5mm Plossl Telescope Eyepiece 4-element Plossl Design Threaded for Standard 1.25inch plossl eyepiece set Threaded for standard 1.25- inch astronomy filters and barlow lens. Fully multi-coated lenses, 4 lens elements, Blackened lens edges 1.25- inch 12.5mm plossl eyepiece set , gives the widest viewing field along with extra sharpness and long eye relief. 4-element plossl design, has a approx 52 degree AFOV. Perfect for broad-field lunar observations, medium-sized star clusters, and a wide range of cloudy nebulas and deep-sky targets. Fold-down rubber eyeguard Threaded for standard 1.25- inch astronomy filters.