Orion 8887 14.5mm Edge-On Planetary Eyepiece Medium-magnification 1.25" Edge-On eyepiece designed for exceptional planetary and lunar viewing through a telescope Flat field eyepiece design ensures sharp focus out to the edge of their wide 55-degree apparent field of view Barrel distortion and field curvature commonly seen in standard eyepiece designs are delightfully absent in Edge-On eyepieces 14.5mm focal length eyepiece has long 20mm eye relief for comfortable viewing even with eyeglasses on Threaded for use with 1.25" eyepiece filters