Gosky 6mm 1.25inch Plossl Telescope Eyepiece - 4-element Plossl Design - Threaded for Standard 1.25inch Astronomy Filters 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 1.25 inch 6mm plossl eyepiece, gives the widest viewing field along with extra sharpness and long eye relief Comes with sturdy plastic case-proect the eyepiece from dust and moisture Soft rubber eye guard that's custom fitted with a bayonet mount Threaded for standard 1.25inch astronomy filters and barlow lens