Lunt Zoom EyepieceZoom Telescope Eyepiece General Features: Lunt flat field zoom telescope eyepiece is coated with 0. 1% anti reflective coatings the same coatings we use on our etalons! Use these eyepieces for nighttime as well as when viewing the Sun. 1. 25 barrel. Lunt 7. 2 mm 21. 5mm Telescope Eyepiece Focal length: 7. 2 mm 21. 5 mm Barrel size: 1. 25 Diameter: 47 mm Height: 82 mm Eye relief: 15 mm Lenses Groups: 7 lenses 4 Groups Field of View: 7. 2 mm 53 21. 5 mm