***** **********Best Quality Guranteed. *****25mm eyepiece ideals for all types of reflector telescopes; refractor telescopes and catadioptrics telescopes; threaded for use with 1.25" standard telescope eyepiece filters to deep-sky objects such as nebulas and star clusters*****2 set of fours slices of multi layer film gluing lens; fully-multicoated achromatic design; eliminate chromatic aberration and increase lens permeability to get bright views with impressively high contrast*****The inside of the adapter is fully threaded to minimize reflections; blackened edges and blackened interior is blackened to reduce scattering of stray light and maximize contrast*****40-Deg apparent field of view for broad-field lunar observations of the Moon; planets; medium-sized star clusters; a wide range of cloudy nebulas and many deep space objects and deep-sky targets*****Comes with soft rubber eyeguard; the sturdy plastic case-protects the eyepiece from dust and moisture and perfects for the bayonet mount