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The SVBONY 1.25" 66 degree ultra wide angle HD telescope accessory sets gives the wide viewing field along with extra sharpness and long eye reliefThe approx 66 degree AFOV is Perfect for broad field lunar observations;medium sized star clusters;and a wide range of cloudy nebulas and deep sky targetsIt comes with sturdy lens cover protecting the eyepiece from dust and moisture;soft rubber eye guard that's custom fitted with a bayonet mount;threaded for standard 1.25" astronomy filters and Barlow lensMain points:Fully multi coated 66 degree ultra wide long eye relief eyepieceStandard 1.25" astronomy telescope 4 piece eyepiece kitsWide 66 deg apparent field makes it very easy to get on target when switching eyepiecesMulti element design delivers sharp images with good color correction and contrastAluminum 1.25" eyepiece barrel is internally blackened to eliminate light scatteringThe collapsible rubber eye guard to block out light and to accommodate persons with glassesEdge-blackened optics and advanced multi coated opticsThe 16mm eye relief;awesome long and very comfortableThreaded to accept 1.25" filtersDesign:15mm:4-elements in 3 groupsSpecifications:Eyepiece series:upgraded ultra wideFocal length:15mmBarrel size: 1.25"/31.7mmApparent field of view:66 degreeLens material:optical glass lensesFilter threads:standard 1.25" filter threadCoating:fully multi coated broadband greenRubber eye guard:yesNet weight:360g/12.7ozPackage Includes:1x 15mm eyepiece