The celestron x cel lx 7 mm eyepiece has a brand new sleek robust design and a twist up eye guard these eyepieces are especially designed for comfort and ease of use they also have a wide 60 deg field of view and 6 element fully multi coated optics for magnificent wide field performance x cel lx eyepieces are parfocal and require little to no focusing when changing from low to high power rrfeaturesr wide field of view enhances views of the night sky through a single lensr 6 element full