Trying to decide which refractor telescope to get? With Celestron's Onyx 80EDF premium refractor with Fluoro-ED glass and Starbright XLT coatings, the choice couldn't be more clear. This high-end refractor telescope also features a 2" Crayford style rotatable focuser with built-on metal sight scope and extendable lens shade. It comes standard with a premium foam-lined aluminum carrying case, and the tripod mount is adaptable to the more advanced CG-5 mount.