Gosky 10mm 1.25inch Plossl Telescope Eyepiece - 4-element Plossl Design - Threaded for Standard 1.25inch Astronomy Filters (10mm) 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 Soft rubber eye guard that's custom fitted with a bayonet mount 1.25 inch 10mm plossl eyepiece, gives the widest viewing field along with extra sharpness and long eye relief Threaded for standard 1.25inch astronomy filters and barlow lens medium-sized star clusters, and a wide range of cloudy nebulas and deep-sky targets