6mm 9mm 15mm 20mm Set Orion Expanse Eyepieces Money-saving set of all four Orion Expanse telescope eyepieces Set includes 6mm, 9mm, 15mm, and 20mm focal length eyepieces for a variety of magnifications through any telescope Each Expanse eyepiece boasts a wide, 66deg apparent field of view for big, pleasing views Each eyepiece has great eye relief so eyeglass wearers can view the entire field without removing their glasses Expanse eyepieces are threaded for use with 1.25" eyepiece filters