Vixen 18mm Lanthanum Series 1.25" Eyepiece with 50 Degree Field of View & Long Eye Relief.

These Vixen brand eyepieces (6 to 8 elements) are a special breed, using the rare earth glass lanthanum in one of their field lenses, for almost total freedom from any visual aberrations. All focal lengths have a comfortable 20mm of eye relief. Even when using the 2.5mm LV eyepiece on a telescope, you'll have eye relief of 20mm! These eyepieces also feature soft rubber eyecups, rubber coated bodies, and fully multicoated lenses for optical excellence.