Orion 8246 21mm Stratus Wide-Field Eyepiece This 21mm telescope eyepiece sports a monster 1-1/4"-diameter eye lens and a generous 20mm eye relief Stratus offers a 68 degrees apparent field of view for a wide-field window into the heavens Eyepiece optics are fully multi-coated to maximize light transmission Lens edges are blackened to ensure excellent contrast in every view Threaded for use with 1.25" eyepiece filters - can be used in both 1.25" and 2" telescope focusers