Svbony 3Mm-8Mm Planetary Zoom Eyepiece For Telescope

1.25-inch

adjust eye position changed Constant pupil changing field stop changing pupil distance Constant pupil distance Environmentally friendly rubber eyepiece Parfocal design eyepiece remains constant field stop diameter friendly rubber eyecup improving visual experience non-slip rubber protective Planetary Zoom removable environmentally friendly rubber protective ring Telescope Constant field visual experience Foldable Zoom Eyepiece zoom eyepiece Parfocal