These Plossl eyepieces are a great value for the amateur astronomer. We get them directly from the manufacturer to save you money This is a very nice low power standand Plossl eyepiece. The 1.25 inch 40mm plossl eyepiece, gives the widest viewing field along with extra sharpness and long eye relief. 4-element plossl design, has a approx 52 degree AFOV.4-element plossl design, has a approx 52 degree AFOV. The high quality optical lens minimizes internal reflection and maximizes contrast. The blackened eyepiece barrel also prevents reflection. 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