Vixen Optics 1859 Vixen GLH48T Zoom Eyepiece for Spotting Scopes (Black) Eye Relief: 25mm Real FOV: 4.4 Degree, .3.3 Degree, .2.4 Degree Exit Pupil: 4.9mm, 4.5 mm, 4.3mm Brightness: .24, 20.2, .18.5 Near Focus: 3.5m, S=4m/A=4m, S=9.2m/A=9.2m