Orion 8886 9mm Edge On Planetary Eyepiece 9mm focal length Orion Edge-On 1.25" telescope eyepiece designed for exceptional planetary and lunar viewing Flat field design ensures sharp focus out to the edge of the eyepiece's wide 55 degrees apparent field of view Barrel distortion and field curvature commonly seen in standard eyepiece designs are gone 9mm eyepiece has long 20mm eye relief for comfortable viewing even with eyeglasses on The amazingly affordable 9mm Edge-On eyepiece wont have you on edge financially!