High-quality, affordable 20mm telescope eyepiece offers a wide field of view and superior performance at a bargain price.;Generous 18mm eye relief allows comfortable viewing distance and lets eyeglass wearers see the entire field of view.;Wide 66-deg apparent field offers expansive views of the moon, star clusters, and the Milky Way.;5-element design delivers sharp images with good color correction and contrast.;Aluminum 1.25 eyepiece barrel is internally blackened to eliminate light scattering, and is threaded to accept 1.25 filters.